diff --git a/plugins/imdiag/imdiag.c b/plugins/imdiag/imdiag.c
index 607d51e08..a10b20f02 100644
--- a/plugins/imdiag/imdiag.c
+++ b/plugins/imdiag/imdiag.c
@@ -36,6 +36,8 @@
 #include <netdb.h>
 #include <sys/types.h>
 #include <sys/socket.h>
+#include <pthread.h>
+#include <semaphore.h>
 #if HAVE_FCNTL_H
 #include <fcntl.h>
 #endif
@@ -55,6 +57,7 @@
 #include "queue.h"
 #include "lookup.h"
 #include "net.h" /* for permittedPeers, may be removed when this is removed */
+#include "statsobj.h"
 
 MODULE_TYPE_INPUT
 MODULE_TYPE_NOKEEP
@@ -68,6 +71,7 @@ DEFobjCurrIf(netstrm)
 DEFobjCurrIf(errmsg)
 DEFobjCurrIf(datetime)
 DEFobjCurrIf(prop)
+DEFobjCurrIf(statsobj)
 
 /* Module static data */
 static tcpsrv_t *pOurTcpsrv = NULL;  /* our TCP server(listener) TODO: change for multiple instances */
@@ -76,6 +80,18 @@ static prop_t *pInputName = NULL;	/* there is only one global inputName for all
 static prop_t *pRcvDummy = NULL;
 static prop_t *pRcvIPDummy = NULL;
 
+statsobj_t *diagStats;
+STATSCOUNTER_DEF(potentialArtificialDelayMs, mutPotentialArtificialDelayMs)
+STATSCOUNTER_DEF(actualArtificialDelayMs, mutActualArtificialDelayMs)
+STATSCOUNTER_DEF(delayInvocationCount, mutDelayInvocationCount)
+
+static sem_t statsReportingBlocker;
+static long statsReportingBlockStartTimeMs = 0;
+static int allowOnlyOnce = 0;
+DEF_ATOMIC_HELPER_MUT(mutAllowOnlyOnce);
+pthread_mutex_t mutStatsReporterWatch;
+pthread_cond_t statsReporterWatch;
+int statsReported = 0;
 
 /* config settings */
 struct modConfData_s {
@@ -334,6 +350,96 @@ finalize_it:
 	RETiRet;
 }
 
+static void
+imdiag_statsReadCallback(statsobj_t __attribute__((unused)) *ignore_stats,
+						   void __attribute__((unused)) *ignore_ctx) {
+	long waitStartTimeMs = currentTimeMills();
+	sem_wait(&statsReportingBlocker);
+	long delta = currentTimeMills() - waitStartTimeMs;
+	if (ATOMIC_DEC_AND_FETCH(&allowOnlyOnce, &mutAllowOnlyOnce) < 0) {
+		sem_post(&statsReportingBlocker);
+	} else {
+		errmsg.LogError(0, RS_RET_OK, "imdiag(stats-read-callback): current stats-reporting "
+						"cycle will proceed now, next reporting cycle will again be blocked");
+	}
+
+	if (pthread_mutex_lock(&mutStatsReporterWatch) == 0) {
+		statsReported = 1;
+		pthread_cond_signal(&statsReporterWatch);
+		pthread_mutex_unlock(&mutStatsReporterWatch);
+	}
+	
+	if (delta > 0) {
+		STATSCOUNTER_ADD(actualArtificialDelayMs, mutActualArtificialDelayMs, delta);
+	}
+}
+
+static rsRetVal
+blockStatsReporting(tcps_sess_t *pSess) {
+	DEFiRet;
+
+	sem_wait(&statsReportingBlocker);
+	CHKiConcCtrl(pthread_mutex_lock(&mutStatsReporterWatch));
+	statsReported = 0;
+	CHKiConcCtrl(pthread_mutex_unlock(&mutStatsReporterWatch));
+	ATOMIC_STORE_0_TO_INT(&allowOnlyOnce, &mutAllowOnlyOnce);
+	statsReportingBlockStartTimeMs = currentTimeMills();
+	errmsg.LogError(0, RS_RET_OK, "imdiag: blocked stats reporting");
+	CHKiRet(sendResponse(pSess, "next stats reporting call will be blocked\n"));
+
+finalize_it:
+	if (iRet != RS_RET_OK) {
+		errmsg.LogError(0, iRet, "imdiag: block-stats-reporting wasn't successful");
+		CHKiRet(sendResponse(pSess, "imdiag::error something went wrong\n"));
+	}
+	RETiRet;
+}
+
+static rsRetVal
+awaitStatsReport(uchar *pszCmd, tcps_sess_t *pSess) {
+	uchar subCmd[1024];
+	int blockAgain = 0;
+	DEFiRet;
+
+	getFirstWord(&pszCmd, subCmd, sizeof(subCmd), TO_LOWERCASE);
+	blockAgain = (ustrcmp(UCHAR_CONSTANT("block_again"), subCmd) == 0);
+	if (statsReportingBlockStartTimeMs > 0) {
+		long delta = currentTimeMills() - statsReportingBlockStartTimeMs;
+		if (blockAgain) {
+			ATOMIC_STORE_1_TO_INT(&allowOnlyOnce, &mutAllowOnlyOnce);
+			errmsg.LogError(0, RS_RET_OK, "imdiag: un-blocking ONLY the next cycle of stats reporting");
+		} else {
+			statsReportingBlockStartTimeMs = 0;
+			errmsg.LogError(0, RS_RET_OK, "imdiag: un-blocking stats reporting");
+		}
+		sem_post(&statsReportingBlocker);
+		errmsg.LogError(0, RS_RET_OK, "imdiag: stats reporting unblocked");
+		STATSCOUNTER_ADD(potentialArtificialDelayMs, mutPotentialArtificialDelayMs, delta);
+		STATSCOUNTER_INC(delayInvocationCount, mutDelayInvocationCount);
+		errmsg.LogError(0, RS_RET_OK, "imdiag: will now await next reporting cycle");
+		CHKiConcCtrl(pthread_mutex_lock(&mutStatsReporterWatch));
+		while (! statsReported) {
+			CHKiConcCtrl(pthread_cond_wait(&statsReporterWatch, &mutStatsReporterWatch));
+		}
+		statsReported = 0;
+		CHKiConcCtrl(pthread_mutex_unlock(&mutStatsReporterWatch));
+		if (blockAgain) {
+			statsReportingBlockStartTimeMs = currentTimeMills();
+		}
+		errmsg.LogError(0, RS_RET_OK, "imdiag: stats were reported, wait complete, returning");
+		CHKiRet(sendResponse(pSess, "stats reporting was unblocked\n"));
+	} else {
+		CHKiRet(sendResponse(pSess, "imdiag::error : stats reporting was not blocked, bug?\n"));
+	}
+
+finalize_it:
+	if (iRet != RS_RET_OK) {
+		errmsg.LogError(0, iRet, "imdiag: stats-reporting unblock + await-run wasn't successfully completed");
+		CHKiRet(sendResponse(pSess, "imdiag::error something went wrong\n"));
+	}
+	RETiRet;
+}
+
 /* Function to handle received messages. This is our core function!
  * rgerhards, 2009-05-24
  */
@@ -369,6 +475,10 @@ OnMsgReceived(tcps_sess_t *pSess, uchar *pRcv, int iLenMsg)
 		CHKiRet(awaitLookupTableReload(pSess));
 	} else if(!ustrcmp(cmdBuf, UCHAR_CONSTANT("injectmsg"))) {
 		CHKiRet(injectMsg(pszMsg, pSess));
+	} else if(!ustrcmp(cmdBuf, UCHAR_CONSTANT("blockstatsreporting"))) {
+		CHKiRet(blockStatsReporting(pSess));
+	} else if(!ustrcmp(cmdBuf, UCHAR_CONSTANT("awaitstatsreport"))) {
+		CHKiRet(awaitStatsReport(pszMsg, pSess));
 	} else {
 		dbgprintf("imdiag unkown command '%s'\n", cmdBuf);
 		CHKiRet(sendResponse(pSess, "unkown command '%s'\n", cmdBuf));
@@ -517,6 +627,12 @@ CODESTARTmodExit
 	/* free some globals to keep valgrind happy */
 	free(pszInputName);
 
+	statsobj.Destruct(&diagStats);
+	sem_destroy(&statsReportingBlocker);
+	DESTROY_ATOMIC_HELPER_MUT(mutAllowOnlyOnce);
+	pthread_cond_destroy(&statsReporterWatch);
+	pthread_mutex_destroy(&mutStatsReporterWatch);
+
 	/* release objects we used */
 	objRelease(net, LM_NET_FILENAME);
 	objRelease(netstrm, LM_NETSTRMS_FILENAME);
@@ -525,6 +641,7 @@ CODESTARTmodExit
 	objRelease(errmsg, CORE_COMPONENT);
 	objRelease(datetime, CORE_COMPONENT);
 	objRelease(prop, CORE_COMPONENT);
+	objRelease(statsobj, CORE_COMPONENT);
 ENDmodExit
 
 
@@ -570,6 +687,7 @@ CODEmodInit_QueryRegCFSLineHdlr
 	CHKiRet(objUse(errmsg, CORE_COMPONENT));
 	CHKiRet(objUse(datetime, CORE_COMPONENT));
 	CHKiRet(objUse(prop, CORE_COMPONENT));
+	CHKiRet(objUse(statsobj, CORE_COMPONENT));
 
 	/* register config file handlers */
 	CHKiRet(omsdRegCFSLineHdlr(UCHAR_CONSTANT("imdiagserverrun"), 0, eCmdHdlrGetWord,
@@ -585,7 +703,28 @@ CODEmodInit_QueryRegCFSLineHdlr
 	CHKiRet(omsdRegCFSLineHdlr(UCHAR_CONSTANT("imdiagserverinputname"), 0,
 				   eCmdHdlrGetWord, NULL, &pszInputName, STD_LOADABLE_MODULE_ID));
 	CHKiRet(omsdRegCFSLineHdlr(UCHAR_CONSTANT("resetconfigvariables"), 1, eCmdHdlrCustomHandler,
-		resetConfigVariables, NULL, STD_LOADABLE_MODULE_ID));
+							   resetConfigVariables, NULL, STD_LOADABLE_MODULE_ID));
+
+	sem_init(&statsReportingBlocker, 0, 1);
+	INIT_ATOMIC_HELPER_MUT(mutAllowOnlyOnce);
+	CHKiConcCtrl(pthread_mutex_init(&mutStatsReporterWatch, NULL));
+	CHKiConcCtrl(pthread_cond_init(&statsReporterWatch, NULL));
+
+	CHKiRet(statsobj.Construct(&diagStats));
+	CHKiRet(statsobj.SetName(diagStats, UCHAR_CONSTANT("imdiag-stats-reporting-controller")));
+	CHKiRet(statsobj.SetOrigin(diagStats, UCHAR_CONSTANT("imdiag")));
+	statsobj.SetStatsObjFlags(diagStats, STATSOBJ_FLAG_DO_PREPEND);
+	STATSCOUNTER_INIT(potentialArtificialDelayMs, mutPotentialArtificialDelayMs);
+	CHKiRet(statsobj.AddCounter(diagStats, UCHAR_CONSTANT("potentialTotalArtificialDelayInMs"),
+								ctrType_IntCtr, CTR_FLAG_NONE, &potentialArtificialDelayMs));
+	STATSCOUNTER_INIT(actualArtificialDelayMs, mutActualArtificialDelayMs);
+	CHKiRet(statsobj.AddCounter(diagStats, UCHAR_CONSTANT("actualTotalArtificialDelayInMs"),
+							ctrType_IntCtr, CTR_FLAG_NONE, &actualArtificialDelayMs));
+	STATSCOUNTER_INIT(delayInvocationCount, mutDelayInvocationCount);
+	CHKiRet(statsobj.AddCounter(diagStats, UCHAR_CONSTANT("delayInvocationCount"),
+								ctrType_IntCtr, CTR_FLAG_NONE, &delayInvocationCount));
+	CHKiRet(statsobj.SetReadNotifier(diagStats, imdiag_statsReadCallback, NULL));
+	CHKiRet(statsobj.ConstructFinalize(diagStats));
 ENDmodInit
 
 
diff --git a/runtime/dynstats.c b/runtime/dynstats.c
index a4d34328b..167069fd0 100644
--- a/runtime/dynstats.c
+++ b/runtime/dynstats.c
@@ -70,30 +70,31 @@ finalize_it:
 }
 
 static inline void
-dynstats_destroyCtr(dynstats_bucket_t *b, dynstats_ctr_t *ctr, uint8_t destructStatsCtr) {
-	if (destructStatsCtr) {
-		statsobj.DestructCounter(b->stats, ctr->pCtr);
-	}
+dynstats_destroyCtr(dynstats_ctr_t *ctr) {
+	statsobj.DestructUnlinkedCounter(ctr->pCtr);
 	free(ctr->metric);
 	free(ctr);
 }
 
 static inline void /* assumes exclusive access to bucket */
-dynstats_destroyCounters(dynstats_bucket_t *b) {
+dynstats_destroyCountersIn(dynstats_bucket_t *b, htable *table, dynstats_ctr_t *ctrs) {
 	dynstats_ctr_t *ctr;
-
-    hashtable_destroy(b->table, 0);
-	statsobj.DestructAllCounters(b->stats);
-	while(1) {
-        ctr = b->ctrs;
-		if (ctr == NULL) {
-			break;
-		} else {
-            b->ctrs = ctr->next;
-			dynstats_destroyCtr(b, ctr, 0);
-		}
+	int ctrs_purged = 0;
+	hashtable_destroy(table, 0);
+	while (ctrs != NULL) {
+		ctr = ctrs;
+		ctrs = ctrs->next;
+		dynstats_destroyCtr(ctr);
+		ctrs_purged++;
 	}
-	STATSCOUNTER_BUMP(b->ctrMetricsPurged, b->mutCtrMetricsPurged, b->metricCount);
+	STATSCOUNTER_ADD(b->ctrMetricsPurged, b->mutCtrMetricsPurged, ctrs_purged);
+	ATOMIC_SUB(&b->metricCount, ctrs_purged, &b->mutMetricCount);
+}
+
+static inline void /* assumes exclusive access to bucket */
+dynstats_destroyCounters(dynstats_bucket_t *b) {
+	statsobj.UnlinkAllCounters(b->stats);
+	dynstats_destroyCountersIn(b, b->table, b->ctrs);
 }
 
 void
@@ -104,6 +105,7 @@ dynstats_destroyBucket(dynstats_bucket_t* b) {
 
 	pthread_rwlock_wrlock(&b->lock);
 	dynstats_destroyCounters(b);
+	dynstats_destroyCountersIn(b, b->survivor_table, b->survivor_ctrs);
 	statsobj.Destruct(&b->stats);
 	free(b->name);
 	pthread_rwlock_unlock(&b->lock);
@@ -137,37 +139,37 @@ dynstats_addBucketMetrics(dynstats_buckets_t *bkts, dynstats_bucket_t *b, const
 	ustrncpy(metric_suffix, suffix_litteral, DYNSTATS_MAX_BUCKET_NS_METRIC_LENGTH);
 	STATSCOUNTER_INIT(b->ctrOpsOverflow, b->mutCtrOpsOverflow);
 	CHKiRet(statsobj.AddManagedCounter(bkts->global_stats, metric_name_buff, ctrType_IntCtr,
-									   CTR_FLAG_RESETTABLE, &(b->ctrOpsOverflow), &b->pOpsOverflowCtr));
+									   CTR_FLAG_RESETTABLE, &(b->ctrOpsOverflow), &b->pOpsOverflowCtr, 1));
 
 	suffix_litteral = UCHAR_CONSTANT("new_metric_add");
 	ustrncpy(metric_suffix, suffix_litteral, DYNSTATS_MAX_BUCKET_NS_METRIC_LENGTH);
 	STATSCOUNTER_INIT(b->ctrNewMetricAdd, b->mutCtrNewMetricAdd);
 	CHKiRet(statsobj.AddManagedCounter(bkts->global_stats, metric_name_buff, ctrType_IntCtr,
-									   CTR_FLAG_RESETTABLE, &(b->ctrNewMetricAdd), &b->pNewMetricAddCtr));
+									   CTR_FLAG_RESETTABLE, &(b->ctrNewMetricAdd), &b->pNewMetricAddCtr, 1));
 
 	suffix_litteral = UCHAR_CONSTANT("no_metric");
 	ustrncpy(metric_suffix, suffix_litteral, DYNSTATS_MAX_BUCKET_NS_METRIC_LENGTH);
 	STATSCOUNTER_INIT(b->ctrNoMetric, b->mutCtrNoMetric);
 	CHKiRet(statsobj.AddManagedCounter(bkts->global_stats, metric_name_buff, ctrType_IntCtr,
-									   CTR_FLAG_RESETTABLE, &(b->ctrNoMetric), &b->pNoMetricCtr));
+									   CTR_FLAG_RESETTABLE, &(b->ctrNoMetric), &b->pNoMetricCtr, 1));
 
 	suffix_litteral = UCHAR_CONSTANT("metrics_purged");
 	ustrncpy(metric_suffix, suffix_litteral, DYNSTATS_MAX_BUCKET_NS_METRIC_LENGTH);
 	STATSCOUNTER_INIT(b->ctrMetricsPurged, b->mutCtrMetricsPurged);
 	CHKiRet(statsobj.AddManagedCounter(bkts->global_stats, metric_name_buff, ctrType_IntCtr,
-									   CTR_FLAG_RESETTABLE, &(b->ctrMetricsPurged), &b->pMetricsPurgedCtr));
+									   CTR_FLAG_RESETTABLE, &(b->ctrMetricsPurged), &b->pMetricsPurgedCtr, 1));
 
 	suffix_litteral = UCHAR_CONSTANT("ops_ignored");
 	ustrncpy(metric_suffix, suffix_litteral, DYNSTATS_MAX_BUCKET_NS_METRIC_LENGTH);
 	STATSCOUNTER_INIT(b->ctrOpsIgnored, b->mutCtrOpsIgnored);
 	CHKiRet(statsobj.AddManagedCounter(bkts->global_stats, metric_name_buff, ctrType_IntCtr,
-									   CTR_FLAG_RESETTABLE, &(b->ctrOpsIgnored), &b->pOpsIgnoredCtr));
+									   CTR_FLAG_RESETTABLE, &(b->ctrOpsIgnored), &b->pOpsIgnoredCtr, 1));
 
 	suffix_litteral = UCHAR_CONSTANT("purge_triggered");
 	ustrncpy(metric_suffix, suffix_litteral, DYNSTATS_MAX_BUCKET_NS_METRIC_LENGTH);
 	STATSCOUNTER_INIT(b->ctrPurgeTriggered, b->mutCtrPurgeTriggered);
 	CHKiRet(statsobj.AddManagedCounter(bkts->global_stats, metric_name_buff, ctrType_IntCtr,
-									   CTR_FLAG_RESETTABLE, &(b->ctrPurgeTriggered), &b->pPurgeTriggeredCtr));
+									   CTR_FLAG_RESETTABLE, &(b->ctrPurgeTriggered), &b->pPurgeTriggeredCtr, 1));
 
 finalize_it:
 	free(metric_name_buff);
@@ -187,7 +189,7 @@ finalize_it:
 		if (b->pOpsIgnoredCtr != NULL) {
 			statsobj.DestructCounter(bkts->global_stats, b->pOpsIgnoredCtr);
 		}
-        if (b->pPurgeTriggeredCtr != NULL) {
+		if (b->pPurgeTriggeredCtr != NULL) {
 			statsobj.DestructCounter(bkts->global_stats, b->pPurgeTriggeredCtr);
 		}
 	}
@@ -197,29 +199,54 @@ finalize_it:
 static void
 no_op_free(void __attribute__((unused)) *ignore)  {}
 
-static rsRetVal
-dynstats_resetBucket(dynstats_bucket_t *b, uint8_t do_purge) {
+static rsRetVal  /* assumes exclusive access to bucket */
+dynstats_rebuildSurvivorTable(dynstats_bucket_t *b) {
+	htable *survivor_table = NULL;
+	htable *new_table = NULL;
 	size_t htab_sz;
 	DEFiRet;
+	
 	htab_sz = (size_t) (DYNSTATS_HASHTABLE_SIZE_OVERPROVISIONING * b->maxCardinality + 1);
+	if (b->table == NULL) {
+		CHKmalloc(survivor_table = create_hashtable(htab_sz, hash_from_string, key_equals_string, no_op_free));
+	}
+	CHKmalloc(new_table = create_hashtable(htab_sz, hash_from_string, key_equals_string, no_op_free));
+	statsobj.UnlinkAllCounters(b->stats);
+	if (b->survivor_table != NULL) {
+		dynstats_destroyCountersIn(b, b->survivor_table, b->survivor_ctrs);
+	}
+	b->survivor_table = (b->table == NULL) ? survivor_table : b->table;
+	b->survivor_ctrs = b->ctrs;
+	b->table = new_table;
+	b->ctrs = NULL;
+finalize_it:
+	if (iRet != RS_RET_OK) {
+		errmsg.LogError(errno, RS_RET_INTERNAL_ERROR, "error trying to evict TTL-expired metrics of dyn-stats bucket named: %s", b->name);
+		if (new_table == NULL) {
+			errmsg.LogError(errno, RS_RET_INTERNAL_ERROR, "error trying to initialize hash-table for dyn-stats bucket named: %s", b->name);
+		} else {
+			hashtable_destroy(new_table, 0);
+		}
+		if (b->table == NULL) {
+			if (survivor_table == NULL) {
+				errmsg.LogError(errno, RS_RET_INTERNAL_ERROR, "error trying to initialize ttl-survivor hash-table for dyn-stats bucket named: %s", b->name);
+			} else {
+				hashtable_destroy(survivor_table, 0);
+			}
+		}
+	}
+	RETiRet;
+}
+
+static rsRetVal
+dynstats_resetBucket(dynstats_bucket_t *b) {
+	DEFiRet;
 	pthread_rwlock_wrlock(&b->lock);
-	if (do_purge) {
-		dynstats_destroyCounters(b);
-	}
-	ATOMIC_STORE_0_TO_INT(&b->metricCount, &b->mutMetricCount);
+	CHKiRet(dynstats_rebuildSurvivorTable(b));
 	STATSCOUNTER_INC(b->ctrPurgeTriggered, b->mutCtrPurgeTriggered);
-    b->ctrs = NULL;
-	if ((b->table = create_hashtable(htab_sz, hash_from_string, key_equals_string, no_op_free)) == NULL) {
-		errmsg.LogError(errno, RS_RET_INTERNAL_ERROR, "error trying to initialize hash-table for dyn-stats bucket named: %s", b->name);
-		ABORT_FINALIZE(RS_RET_INTERNAL_ERROR);
-	}
-			
 	timeoutComp(&b->metricCleanupTimeout, b->unusedMetricLife);
 finalize_it:
 	pthread_rwlock_unlock(&b->lock);
-	if (iRet != RS_RET_OK) {
-		statsobj.Destruct(&b->stats);
-	}
 	RETiRet;
 }
 
@@ -231,7 +258,7 @@ dynstats_resetIfExpired(dynstats_bucket_t *b) {
 	pthread_rwlock_unlock(&b->lock);
 	if (timeout == 0) {
 		errmsg.LogMsg(0, RS_RET_TIMED_OUT, LOG_INFO, "dynstats: bucket '%s' is being reset", b->name);
-		dynstats_resetBucket(b, 1);
+		dynstats_resetBucket(b);
 	}
 }
 
@@ -292,17 +319,17 @@ dynstats_newBucket(const uchar* name, uint8_t resettable, uint32_t maxCardinalit
 
 		CHKiRet(dynstats_initNewBucketStats(b));
 
-		CHKiRet(dynstats_resetBucket(b, 0));
+		CHKiRet(dynstats_resetBucket(b));
 
 		CHKiRet(dynstats_addBucketMetrics(bkts, b, name));
 
 		pthread_rwlock_wrlock(&bkts->lock);
-        if (bkts->list == NULL) {
-            bkts->list = b;
-        } else {
-            b->next = bkts->list;
-            bkts->list = b;
-        }
+		if (bkts->list == NULL) {
+			bkts->list = b;
+		} else {
+			b->next = bkts->list;
+			bkts->list = b;
+		}
 		pthread_rwlock_unlock(&bkts->lock);
 	} else {
 		errmsg.LogError(0, RS_RET_INTERNAL_ERROR, "dynstats: bucket creation failed, as global-initialization of buckets was unsuccessful");
@@ -317,8 +344,7 @@ finalize_it:
 			pthread_rwlock_destroy(&b->lock);
 		}
 		if (b != NULL) {
-			free(b->name);
-			free(b);
+			dynstats_destroyBucket(b);
 		}
 	}
 	RETiRet;
@@ -355,9 +381,9 @@ dynstats_processCnf(struct cnfobj *o) {
 					  "param '%s'\n", modpblk.descr[i].name);
 		}
 	}
-    if (name != NULL) {
-        CHKiRet(dynstats_newBucket(name, resettable, maxCardinality, unusedMetricLife));
-    }
+	if (name != NULL) {
+		CHKiRet(dynstats_newBucket(name, resettable, maxCardinality, unusedMetricLife));
+	}
 
 finalize_it:
 	free(name);
@@ -400,7 +426,7 @@ dynstats_destroyAllBuckets() {
 			if (b == NULL) {
 				break;
 			} else {
-                bkts->list = b->next;
+				bkts->list = b->next;
 				dynstats_destroyBucket(b);
 			}
 		}
@@ -416,13 +442,13 @@ dynstats_findBucket(const uchar* name) {
 	bkts = &loadConf->dynstats_buckets;
 	if (bkts->initialized) {
 		pthread_rwlock_rdlock(&bkts->lock);
-        b = bkts->list;
-        while(b != NULL) {
-            if (! ustrcmp(name, b->name)) {
+		b = bkts->list;
+		while(b != NULL) {
+			if (! ustrcmp(name, b->name)) {
 				break;
 			}
-            b = b->next;
-        }
+			b = b->next;
+		}
 		pthread_rwlock_unlock(&bkts->lock);
 	} else {
 		b = NULL;
@@ -441,14 +467,14 @@ dynstats_createCtr(dynstats_bucket_t *b, const uchar* metric, dynstats_ctr_t **c
 	STATSCOUNTER_INIT((*ctr)->ctr, (*ctr)->mutCtr);
 	CHKiRet(statsobj.AddManagedCounter(b->stats, metric, ctrType_IntCtr,
 									   b->resettable ? CTR_FLAG_MUST_RESET : CTR_FLAG_NONE,
-									   &(*ctr)->ctr, &(*ctr)->pCtr));
+									   &(*ctr)->ctr, &(*ctr)->pCtr, 0));
 finalize_it:
 	if (iRet != RS_RET_OK) {
-        if ((*ctr) != NULL) {
-            free((*ctr)->metric);
-            free(*ctr);
-            *ctr = NULL;
-        }
+		if ((*ctr) != NULL) {
+			free((*ctr)->metric);
+			free(*ctr);
+			*ctr = NULL;
+		}
 	}
 	RETiRet;
 }
@@ -456,7 +482,7 @@ finalize_it:
 static rsRetVal
 dynstats_addNewCtr(dynstats_bucket_t *b, const uchar* metric, uint8_t doInitialIncrement) {
 	dynstats_ctr_t *ctr;
-	dynstats_ctr_t *found_ctr;
+	dynstats_ctr_t *found_ctr, *survivor_ctr, *effective_ctr;
 	int created;
 	uchar *copy_of_key = NULL;
 	DEFiRet;
@@ -471,25 +497,42 @@ dynstats_addNewCtr(dynstats_bucket_t *b, const uchar* metric, uint8_t doInitialI
 	CHKiRet(dynstats_createCtr(b, metric, &ctr));
 
 	pthread_rwlock_wrlock(&b->lock);
-    found_ctr = (dynstats_ctr_t*) hashtable_search(b->table, ctr->metric);
+	found_ctr = (dynstats_ctr_t*) hashtable_search(b->table, ctr->metric);
 	if (found_ctr != NULL) {
 		if (doInitialIncrement) {
 			STATSCOUNTER_INC(found_ctr->ctr, found_ctr->mutCtr);
 		}
 	} else {
-        copy_of_key = ustrdup(ctr->metric);
-        if (copy_of_key != NULL) {
-            created = hashtable_insert(b->table, copy_of_key, ctr);
-        }
+		copy_of_key = ustrdup(ctr->metric);
+		if (copy_of_key != NULL) {
+			survivor_ctr = (dynstats_ctr_t*) hashtable_search(b->survivor_table, ctr->metric);
+			if (survivor_ctr == NULL) {
+				effective_ctr = ctr;
+			} else {
+				effective_ctr = survivor_ctr;
+				if (survivor_ctr->prev != NULL) {
+					survivor_ctr->prev->next = survivor_ctr->next;
+				}
+				if (survivor_ctr->next != NULL) {
+					survivor_ctr->next->prev = survivor_ctr->prev;
+				}
+				if (survivor_ctr == b->survivor_ctrs) {
+					b->survivor_ctrs = survivor_ctr->next;
+				}
+			}
+			if ((created = hashtable_insert(b->table, copy_of_key, effective_ctr))) {
+				statsobj.AddPreCreatedCtr(b->stats, effective_ctr->pCtr);
+			}
+		}
 		if (created) {
-            if (b->ctrs == NULL) {
-                b->ctrs = ctr;
-            } else {
-                ctr->next = b->ctrs;
-                b->ctrs = ctr;
-            }
+			if (b->ctrs != NULL) {
+				b->ctrs->prev = effective_ctr;
+			}
+			effective_ctr->prev = NULL;
+			effective_ctr->next = b->ctrs;
+			b->ctrs = effective_ctr;
 			if (doInitialIncrement) {
-				STATSCOUNTER_INC(ctr->ctr, ctr->mutCtr);
+				STATSCOUNTER_INC(effective_ctr->ctr, effective_ctr->mutCtr);
 			}
 		}
 	}
@@ -497,19 +540,19 @@ dynstats_addNewCtr(dynstats_bucket_t *b, const uchar* metric, uint8_t doInitialI
 
 	if (found_ctr != NULL) {
 		//ignore
-	} else if (created) {
+	} else if (created && (effective_ctr != survivor_ctr)) {
 		ATOMIC_INC(&b->metricCount, &b->mutMetricCount);
 		STATSCOUNTER_INC(b->ctrNewMetricAdd, b->mutCtrNewMetricAdd);
-	} else {
-        if (copy_of_key != NULL) {
-            free(copy_of_key);
-        }
+	} else if (! created) {
+		if (copy_of_key != NULL) {
+			free(copy_of_key);
+		}
 		ABORT_FINALIZE(RS_RET_OUT_OF_MEMORY);
 	}
 	
 finalize_it:
-	if ((! created) && (ctr != NULL)) {
-		dynstats_destroyCtr(b, ctr, 1);
+	if (((! created) || (effective_ctr != ctr)) && (ctr != NULL)) {
+		dynstats_destroyCtr(ctr);
 	}
 	RETiRet;
 }
@@ -529,7 +572,7 @@ dynstats_inc(dynstats_bucket_t *b, uchar* metric) {
 	}
 
 	if (pthread_rwlock_tryrdlock(&b->lock) == 0) {
-        ctr = (dynstats_ctr_t *) hashtable_search(b->table, metric);
+		ctr = (dynstats_ctr_t *) hashtable_search(b->table, metric);
 		if (ctr != NULL) {
 			STATSCOUNTER_INC(ctr->ctr, ctr->mutCtr);
 		}
diff --git a/runtime/dynstats.h b/runtime/dynstats.h
index e41e31e59..b4a13966c 100644
--- a/runtime/dynstats.h
+++ b/runtime/dynstats.h
@@ -26,7 +26,9 @@ struct dynstats_ctr_s {
 	STATSCOUNTER_DEF(ctr, mutCtr);
 	ctr_t *pCtr;
 	uchar *metric;
-	struct dynstats_ctr_s *next; /* linked list ptr */
+	/* linked list ptr */
+	struct dynstats_ctr_s *next;
+	struct dynstats_ctr_s *prev;
 };
 
 struct dynstats_bucket_s {
@@ -48,6 +50,11 @@ struct dynstats_bucket_s {
 	ctr_t *pPurgeTriggeredCtr;
 	struct dynstats_bucket_s *next; /* linked list ptr */
 	struct dynstats_ctr_s *ctrs;
+	/*survivor objects are used to keep counter values around for upto unused-ttl duration,
+	  so in case it is accessed within (ttl - 2 * ttl) time-period we can re-store the accumulator value from this */
+	struct dynstats_ctr_s *survivor_ctrs;
+	htable *survivor_table;
+	
 	uint32_t maxCardinality;
 	uint32_t metricCount;
 	pthread_mutex_t mutMetricCount;
diff --git a/runtime/srUtils.h b/runtime/srUtils.h
index 448fc6b71..36ecfc7dc 100644
--- a/runtime/srUtils.h
+++ b/runtime/srUtils.h
@@ -96,6 +96,7 @@ int containsGlobWildcard(char *str);
 void seedRandomNumber();
 #define MAX_RANDOM_NUMBER RAND_MAX
 long int randomNumber();
+long currentTimeMills();
 
 /* mutex operations */
 /* some useful constants */
diff --git a/runtime/srutils.c b/runtime/srutils.c
index 8b3e6cd58..f9a27514a 100644
--- a/runtime/srutils.c
+++ b/runtime/srutils.c
@@ -428,6 +428,25 @@ timeoutComp(struct timespec *pt, long iTimeout)
 	return RS_RET_OK; /* so far, this is static... */
 }
 
+long
+currentTimeMills() {
+#	if _POSIX_TIMERS > 0
+	struct timespec tm;
+#   else
+	struct timeval tv;
+#	endif
+
+#	if _POSIX_TIMERS > 0
+	clock_gettime(CLOCK_REALTIME, &tm);
+#	else
+	gettimeofday(&tv, NULL);
+	tm.tv_sec = tv.tv_sec;
+	tm.tv_nsec = tv.tv_usec * 1000;
+#	endif
+
+	return tm.tv_sec * 1000 + (tm.tv_sec / 1000000);
+}
+
 
 /* This function is kind of the reverse of timeoutComp() - it takes an absolute
  * timeout value and computes how far this is in the future. If the value is already
diff --git a/runtime/statsobj.c b/runtime/statsobj.c
index d350ea46a..4ded2bfa9 100644
--- a/runtime/statsobj.c
+++ b/runtime/statsobj.c
@@ -68,12 +68,22 @@ static inline void
 addToObjList(statsobj_t *pThis)
 {
 	pthread_mutex_lock(&mutStats);
-	pThis->prev = objLast;
-	if(objLast != NULL)
-		objLast->next = pThis;
-	objLast = pThis;
-	if(objRoot == NULL)
+	if (pThis->flags && STATSOBJ_FLAG_DO_PREPEND) {
+		pThis->next = objRoot;
+		if (objRoot != NULL) {
+			objRoot->prev = pThis;
+		}
 		objRoot = pThis;
+		if (objLast == NULL)
+			objLast = pThis;
+	} else {
+		pThis->prev = objLast;
+		if(objLast != NULL)
+			objLast->next = pThis;
+		objLast = pThis;
+		if(objRoot == NULL)
+			objRoot = pThis;
+	}
 	pthread_mutex_unlock(&mutStats);
 }
 
@@ -117,6 +127,7 @@ BEGINobjConstruct(statsobj) /* be sure to specify the object type also in END ma
 	pThis->ctrLast = NULL;
 	pThis->ctrRoot = NULL;
 	pThis->read_notifier = NULL;
+	pThis->flags = 0;
 ENDobjConstruct(statsobj)
 
 
@@ -169,6 +180,11 @@ finalize_it:
 	RETiRet;
 }
 
+static void
+setStatsObjFlags(statsobj_t *pThis, int flags) {
+	pThis->flags = flags;
+}
+
 static rsRetVal
 setReportingNamespace(statsobj_t *pThis, uchar *ns)
 {
@@ -186,7 +202,7 @@ finalize_it:
  * is called.
  */
 static rsRetVal
-addManagedCounter(statsobj_t *pThis, const uchar *ctrName, statsCtrType_t ctrType, int8_t flags, void *pCtr, ctr_t **entryRef)
+addManagedCounter(statsobj_t *pThis, const uchar *ctrName, statsCtrType_t ctrType, int8_t flags, void *pCtr, ctr_t **entryRef, int8_t linked)
 {
 	ctr_t *ctr;
 	DEFiRet;
@@ -210,7 +226,9 @@ addManagedCounter(statsobj_t *pThis, const uchar *ctrName, statsCtrType_t ctrTyp
 		ctr->val.pInt = (int*) pCtr;
 		break;
 	}
-	addCtrToList(pThis, ctr);
+	if (linked) {
+		addCtrToList(pThis, ctr);
+	}
 	*entryRef = ctr;
 
 finalize_it:
@@ -223,21 +241,33 @@ finalize_it:
 	RETiRet;
 }
 
+static inline void
+addPreCreatedCounter(statsobj_t *pThis, ctr_t *pCtr)
+{
+	pCtr->next = NULL;
+	pCtr->prev = NULL;
+	addCtrToList(pThis, pCtr);
+}
+
 static rsRetVal
 addCounter(statsobj_t *pThis, const uchar *ctrName, statsCtrType_t ctrType, int8_t flags, void *pCtr)
 {
 	ctr_t *ctr;
 	DEFiRet;
-	CHKiRet(addManagedCounter(pThis, ctrName, ctrType, flags, pCtr, &ctr));
+	CHKiRet(addManagedCounter(pThis, ctrName, ctrType, flags, pCtr, &ctr, 1));
 finalize_it:
 	RETiRet;
 }
 
-static rsRetVal
+static void
+destructUnlinkedCounter(ctr_t *ctr) {
+	free(ctr->name);
+	free(ctr);
+}
+
+static void
 destructCounter(statsobj_t *pThis, ctr_t *pCtr)
 {
-    DEFiRet;
-
     pthread_mutex_lock(&pThis->mutCtr);
 	if (pCtr->prev != NULL) {
 		pCtr->prev->next = pCtr->next;
@@ -252,10 +282,7 @@ destructCounter(statsobj_t *pThis, ctr_t *pCtr)
 		pThis->ctrRoot = pCtr->next;
 	}
 	pthread_mutex_unlock(&pThis->mutCtr);
-	free(pCtr->name);
-	free(pCtr);
-    
-    RETiRet;
+	destructUnlinkedCounter(pCtr);
 }
 
 static inline void
@@ -524,7 +551,6 @@ finalize_it:
 	RETiRet;
 }
 
-
 /* Enable statistics gathering. currently there is no function to disable it
  * again, as this is right now not needed.
  */
@@ -578,24 +604,26 @@ finalize_it:
 	RETiRet;
 }
 
-
-static rsRetVal
-destructAllCounters(statsobj_t *pThis) {
-	DEFiRet;
-	ctr_t *ctr, *ctrToDel;
-
+static ctr_t*
+unlinkAllCounters(statsobj_t *pThis) {
+	ctr_t *ctr;
+	pthread_mutex_lock(&pThis->mutCtr);
 	ctr = pThis->ctrRoot;
+	pThis->ctrLast = NULL;
+	pThis->ctrRoot = NULL;
+	pthread_mutex_unlock(&pThis->mutCtr);
+	return ctr;
+}
+
+static void
+destructUnlinkedCounters(ctr_t *ctr) {
+	ctr_t *ctrToDel;
+
 	while(ctr != NULL) {
 		ctrToDel = ctr;
 		ctr = ctr->next;
-		free(ctrToDel->name);
-		free(ctrToDel);
+		destructUnlinkedCounter(ctrToDel);
 	}
-
-	pThis->ctrLast = NULL;
-	pThis->ctrRoot = NULL;
-	
-	RETiRet;
 }
 
 /* check if a sender has not sent info to us for an extended period
@@ -644,7 +672,7 @@ CODESTARTobjDestruct(statsobj)
 	removeFromObjList(pThis);
 
 	/* destruct counters */
-	CHKiRet(destructAllCounters(pThis));
+	destructUnlinkedCounters(unlinkAllCounters(pThis));
 
 	pthread_mutex_destroy(&pThis->mutCtr);
 	free(pThis->name);
@@ -681,11 +709,14 @@ CODESTARTobjQueryInterface(statsobj)
 	pIf->SetOrigin = setOrigin;
 	pIf->SetReadNotifier = setReadNotifier;
 	pIf->SetReportingNamespace = setReportingNamespace;
+	pIf->SetStatsObjFlags = setStatsObjFlags;
 	pIf->GetAllStatsLines = getAllStatsLines;
 	pIf->AddCounter = addCounter;
 	pIf->AddManagedCounter = addManagedCounter;
+	pIf->AddPreCreatedCtr = addPreCreatedCounter;
 	pIf->DestructCounter = destructCounter;
-	pIf->DestructAllCounters = destructAllCounters;
+	pIf->DestructUnlinkedCounter = destructUnlinkedCounter;
+	pIf->UnlinkAllCounters = unlinkAllCounters;
 	pIf->EnableStats = enableStats;
 finalize_it:
 ENDobjQueryInterface(statsobj)
diff --git a/runtime/statsobj.h b/runtime/statsobj.h
index 4f47933ed..dd26c0e27 100644
--- a/runtime/statsobj.h
+++ b/runtime/statsobj.h
@@ -56,6 +56,10 @@ typedef enum statsFmtType_e {
 #define CTR_FLAG_RESETTABLE 1
 #define CTR_FLAG_MUST_RESET 2
 
+/* statsobj flags */
+#define STATSOBJ_FLAG_NONE 0
+#define STATSOBJ_FLAG_DO_PREPEND 1
+
 /* helper entity, the counter */
 typedef struct ctr_s {
 	uchar *name;
@@ -79,6 +83,7 @@ struct statsobj_s {
 	pthread_mutex_t mutCtr;		/* to guard counter linked-list ops */
 	ctr_t *ctrRoot;			/* doubly-linked list of statsobj counters */
 	ctr_t *ctrLast;
+	int flags;
 	/* used to link ourselves together */
 	statsobj_t *prev;
 	statsobj_t *next;
@@ -101,12 +106,15 @@ BEGINinterface(statsobj) /* name must also be changed in ENDinterface macro! */
 	rsRetVal (*SetOrigin)(statsobj_t *pThis, uchar *name); /* added v12, 2014-09-08 */
     rsRetVal (*SetReadNotifier)(statsobj_t *pThis, statsobj_read_notifier_t notifier, void* ctx);
 	rsRetVal (*SetReportingNamespace)(statsobj_t *pThis, uchar *ns);
+	void (*SetStatsObjFlags)(statsobj_t *pThis, int flags);
 	//rsRetVal (*GetStatsLine)(statsobj_t *pThis, cstr_t **ppcstr);
 	rsRetVal (*GetAllStatsLines)(rsRetVal(*cb)(void*, cstr_t*), void *usrptr, statsFmtType_t fmt, int8_t bResetCtr);
 	rsRetVal (*AddCounter)(statsobj_t *pThis, const uchar *ctrName, statsCtrType_t ctrType, int8_t flags, void *pCtr);
-	rsRetVal (*AddManagedCounter)(statsobj_t *pThis, const uchar *ctrName, statsCtrType_t ctrType, int8_t flags, void *pCtr, ctr_t **ref);
-	rsRetVal (*DestructCounter)(statsobj_t *pThis, ctr_t *ref);
-	rsRetVal (*DestructAllCounters)(statsobj_t *pThis);
+	rsRetVal (*AddManagedCounter)(statsobj_t *pThis, const uchar *ctrName, statsCtrType_t ctrType, int8_t flags, void *pCtr, ctr_t **ref, int8_t linked);
+	void (*AddPreCreatedCtr)(statsobj_t *pThis, ctr_t *ctr);
+	void (*DestructCounter)(statsobj_t *pThis, ctr_t *ref);
+	void (*DestructUnlinkedCounter)(ctr_t *ctr);
+	ctr_t* (*UnlinkAllCounters)(statsobj_t *pThis);
 	rsRetVal (*EnableStats)(void);
 ENDinterface(statsobj)
 #define statsobjCURR_IF_VERSION 12 /* increment whenever you change the interface structure! */
@@ -173,7 +181,7 @@ void checkGoneAwaySenders(time_t);
 	if(GatherStats) \
 		ATOMIC_INC_uint64(&ctr, &mut);
 
-#define STATSCOUNTER_BUMP(ctr, mut, delta) \
+#define STATSCOUNTER_ADD(ctr, mut, delta) \
 	if(GatherStats) \
 		ATOMIC_ADD_uint64(&ctr, &mut, delta);
 
diff --git a/tests/Makefile.am b/tests/Makefile.am
index ae1ec46c8..43ac0a4bb 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -287,7 +287,8 @@ TESTS +=  \
 	dynstats-json.sh \
 	stats-cee.sh \
 	stats-json-es.sh \
-	dynstats_reset_without_pstats_reset.sh
+	dynstats_reset_without_pstats_reset.sh \
+	dynstats_prevent_premature_eviction.sh
 if HAVE_VALGRIND
 TESTS +=  \
 	dynstats-vg.sh \
@@ -295,7 +296,8 @@ TESTS +=  \
 	dynstats_overflow-vg.sh \
 	dynstats-json-vg.sh \
 	stats-json-vg.sh \
-	stats-cee-vg.sh
+	stats-cee-vg.sh \
+	dynstats_prevent_premature_eviction-vg.sh
 endif
 endif
 
@@ -1061,6 +1063,8 @@ EXTRA_DIST= \
 	dynstats_reset-vg.sh \
 	dynstats.sh \
 	dynstats-vg.sh \
+	dynstats_prevent_premature_eviction.sh \
+	dynstats_prevent_premature_eviction-vg.sh \
 	testsuites/dynstats.conf \
 	testsuites/dynstats_ctr_reset.conf \
 	testsuites/dynstats_reset_without_pstats_reset.conf \
@@ -1275,3 +1279,4 @@ nettester_LDADD = $(SOL_LIBS)
 #rscript_CPPFLAGS =  -I$(top_srcdir) $(PTHREADS_CFLAGS) $(RSRT_CFLAGS)
 #rscript_LDADD = $(RSRT_LIBS) $(ZLIB_LIBS) $(PTHREADS_LIBS) $(SOL_LIBS)
 #rscript_LDFLAGS = -export-dynamic
+
diff --git a/tests/diag.sh b/tests/diag.sh
index a50acc1db..19a79f731 100755
--- a/tests/diag.sh
+++ b/tests/diag.sh
@@ -345,6 +345,18 @@ case $1 in
 		    . $srcdir/diag.sh error-exit 1
 		fi
 		;;
+	 'block-stats-flush')
+		echo blocking stats flush
+		echo "blockStatsReporting" | ./diagtalker || . $srcdir/diag.sh error-exit  $?
+		;;
+	 'await-stats-flush-after-block')
+		echo unblocking stats flush and waiting for it
+		echo "awaitStatsReport" | ./diagtalker || . $srcdir/diag.sh error-exit  $?
+		;;
+	 'allow-single-stats-flush-after-block-and-wait-for-it')
+		echo blocking stats flush
+		echo "awaitStatsReport block_again" | ./diagtalker || . $srcdir/diag.sh error-exit  $?
+		;;
 	 'wait-for-stats-flush')
 		echo "will wait for stats push"
 		while [[ ! -f $2 ]]; do
diff --git a/tests/diagtalker.c b/tests/diagtalker.c
index f12ff9cd5..644ee468a 100644
--- a/tests/diagtalker.c
+++ b/tests/diagtalker.c
@@ -132,6 +132,9 @@ doProcessing()
 		sendCmd(fd, line, len);
 		waitRsp(fd, line, sizeof(line));
 		printf("imdiag[%d]: %s", targetPort, line);
+		if (strstr(line, "imdiag::error") != NULL) {
+			exit(1);
+		}
 	}
 }
 
diff --git a/tests/dynstats_overflow-vg.sh b/tests/dynstats_overflow-vg.sh
index 2e1854e6c..a0ad9d806 100755
--- a/tests/dynstats_overflow-vg.sh
+++ b/tests/dynstats_overflow-vg.sh
@@ -5,30 +5,41 @@ echo ===========================================================================
 echo \[dynstats_overflow-vg.sh\]: test for gathering stats when metrics exceed provisioned capacity
 . $srcdir/diag.sh init
 . $srcdir/diag.sh startup-vg dynstats_overflow.conf
-. $srcdir/diag.sh wait-for-dyn-stats-reset 'rsyslog.out.stats.log' 'msg_stats'
+. $srcdir/diag.sh wait-for-stats-flush 'rsyslog.out.stats.log'
+. $srcdir/diag.sh block-stats-flush
 . $srcdir/diag.sh injectmsg-litteral $srcdir/testsuites/dynstats_input_more_0
-. $srcdir/diag.sh wait-queueempty
-. $srcdir/diag.sh msleep 1000
 . $srcdir/diag.sh injectmsg-litteral $srcdir/testsuites/dynstats_input_more_1
 . $srcdir/diag.sh wait-queueempty
-. $srcdir/diag.sh msleep 3100 #sleep above + this = 4 seconds, so metric-names reset should have happened
-. $srcdir/diag.sh wait-queueempty
+. $srcdir/diag.sh allow-single-stats-flush-after-block-and-wait-for-it
+
 . $srcdir/diag.sh first-column-sum-check 's/.*foo=\([0-9]\+\)/\1/g' 'foo=' 'rsyslog.out.stats.log' 5
 . $srcdir/diag.sh first-column-sum-check 's/.*bar=\([0-9]\+\)/\1/g' 'bar=' 'rsyslog.out.stats.log' 1
 . $srcdir/diag.sh first-column-sum-check 's/.*baz=\([0-9]\+\)/\1/g' 'baz=' 'rsyslog.out.stats.log' 2
+
 . $srcdir/diag.sh custom-assert-content-missing 'quux' 'rsyslog.out.stats.log'
 . $srcdir/diag.sh custom-assert-content-missing 'corge' 'rsyslog.out.stats.log'
 . $srcdir/diag.sh custom-assert-content-missing 'grault' 'rsyslog.out.stats.log'
+
+. $srcdir/diag.sh first-column-sum-check 's/.*new_metric_add=\([0-9]\+\)/\1/g' 'new_metric_add=' 'rsyslog.out.stats.log' 3
+. $srcdir/diag.sh first-column-sum-check 's/.*ops_overflow=\([0-9]\+\)/\1/g' 'ops_overflow=' 'rsyslog.out.stats.log' 5
+. $srcdir/diag.sh first-column-sum-check 's/.*no_metric=\([0-9]\+\)/\1/g' 'no_metric=' 'rsyslog.out.stats.log' 0
+
+#ttl-expiry(2*ttl in worst case, ttl + delta in best) so metric-names reset should have happened
+. $srcdir/diag.sh allow-single-stats-flush-after-block-and-wait-for-it
+. $srcdir/diag.sh await-stats-flush-after-block
+
+. $srcdir/diag.sh wait-for-stats-flush 'rsyslog.out.stats.log'
+
+. $srcdir/diag.sh first-column-sum-check 's/.*metrics_purged=\([0-9]\+\)/\1/g' 'metrics_purged=' 'rsyslog.out.stats.log' 3
+
 rm $srcdir/rsyslog.out.stats.log
 . $srcdir/diag.sh issue-HUP #reopen stats file
-. $srcdir/diag.sh wait-for-dyn-stats-reset 'rsyslog.out.stats.log' 'msg_stats'
+. $srcdir/diag.sh wait-for-stats-flush 'rsyslog.out.stats.log'
+. $srcdir/diag.sh block-stats-flush
 . $srcdir/diag.sh injectmsg-litteral $srcdir/testsuites/dynstats_input_more_2
-. $srcdir/diag.sh msleep 4100
-echo doing shutdown
-. $srcdir/diag.sh shutdown-when-empty
-echo wait on shutdown
-. $srcdir/diag.sh wait-shutdown-vg
-. $srcdir/diag.sh check-exit-vg
+. $srcdir/diag.sh wait-queueempty
+. $srcdir/diag.sh allow-single-stats-flush-after-block-and-wait-for-it
+
 . $srcdir/diag.sh content-check "foo 001 0"
 . $srcdir/diag.sh content-check "bar 002 0"
 . $srcdir/diag.sh content-check "baz 003 0"
@@ -52,5 +63,20 @@ echo wait on shutdown
 . $srcdir/diag.sh first-column-sum-check 's/.*grault=\([0-9]\+\)/\1/g' 'grault=' 'rsyslog.out.stats.log' 1
 . $srcdir/diag.sh first-column-sum-check 's/.*quux=\([0-9]\+\)/\1/g' 'quux=' 'rsyslog.out.stats.log' 1
 
+. $srcdir/diag.sh first-column-sum-check 's/.*new_metric_add=\([0-9]\+\)/\1/g' 'new_metric_add=' 'rsyslog.out.stats.log' 3
+. $srcdir/diag.sh first-column-sum-check 's/.*ops_overflow=\([0-9]\+\)/\1/g' 'ops_overflow=' 'rsyslog.out.stats.log' 1
+. $srcdir/diag.sh first-column-sum-check 's/.*no_metric=\([0-9]\+\)/\1/g' 'no_metric=' 'rsyslog.out.stats.log' 0
+
+. $srcdir/diag.sh allow-single-stats-flush-after-block-and-wait-for-it
+. $srcdir/diag.sh await-stats-flush-after-block
+
+echo doing shutdown
+. $srcdir/diag.sh shutdown-when-empty
+echo wait on shutdown
+. $srcdir/diag.sh wait-shutdown-vg
+. $srcdir/diag.sh check-exit-vg
+
+. $srcdir/diag.sh first-column-sum-check 's/.*metrics_purged=\([0-9]\+\)/\1/g' 'metrics_purged=' 'rsyslog.out.stats.log' 3
+
 . $srcdir/diag.sh custom-assert-content-missing 'foo' 'rsyslog.out.stats.log'
 . $srcdir/diag.sh exit
diff --git a/tests/dynstats_overflow.sh b/tests/dynstats_overflow.sh
index 40e87c819..736860af4 100755
--- a/tests/dynstats_overflow.sh
+++ b/tests/dynstats_overflow.sh
@@ -5,14 +5,12 @@ echo ===========================================================================
 echo \[dynstats_overflow.sh\]: test for gathering stats when metrics exceed provisioned capacity
 . $srcdir/diag.sh init
 . $srcdir/diag.sh startup dynstats_overflow.conf
-. $srcdir/diag.sh wait-for-dyn-stats-reset 'rsyslog.out.stats.log' 'msg_stats'
+. $srcdir/diag.sh wait-for-stats-flush 'rsyslog.out.stats.log'
+. $srcdir/diag.sh block-stats-flush
 . $srcdir/diag.sh injectmsg-litteral $srcdir/testsuites/dynstats_input_more_0
-. $srcdir/diag.sh wait-queueempty
-. $srcdir/diag.sh msleep 800
 . $srcdir/diag.sh injectmsg-litteral $srcdir/testsuites/dynstats_input_more_1
 . $srcdir/diag.sh wait-queueempty
-. $srcdir/diag.sh msleep 3100 #sleep above + this = 2 seconds, so metric-names reset should have happened
-. $srcdir/diag.sh wait-queueempty
+. $srcdir/diag.sh allow-single-stats-flush-after-block-and-wait-for-it
 
 . $srcdir/diag.sh first-column-sum-check 's/.*foo=\([0-9]\+\)/\1/g' 'foo=' 'rsyslog.out.stats.log' 5
 . $srcdir/diag.sh first-column-sum-check 's/.*bar=\([0-9]\+\)/\1/g' 'bar=' 'rsyslog.out.stats.log' 1
@@ -25,17 +23,23 @@ echo \[dynstats_overflow.sh\]: test for gathering stats when metrics exceed prov
 . $srcdir/diag.sh first-column-sum-check 's/.*new_metric_add=\([0-9]\+\)/\1/g' 'new_metric_add=' 'rsyslog.out.stats.log' 3
 . $srcdir/diag.sh first-column-sum-check 's/.*ops_overflow=\([0-9]\+\)/\1/g' 'ops_overflow=' 'rsyslog.out.stats.log' 5
 . $srcdir/diag.sh first-column-sum-check 's/.*no_metric=\([0-9]\+\)/\1/g' 'no_metric=' 'rsyslog.out.stats.log' 0
+
+#ttl-expiry(2*ttl in worst case, ttl + delta in best) so metric-names reset should have happened
+. $srcdir/diag.sh allow-single-stats-flush-after-block-and-wait-for-it
+. $srcdir/diag.sh await-stats-flush-after-block
+
+. $srcdir/diag.sh wait-for-stats-flush 'rsyslog.out.stats.log'
+
 . $srcdir/diag.sh first-column-sum-check 's/.*metrics_purged=\([0-9]\+\)/\1/g' 'metrics_purged=' 'rsyslog.out.stats.log' 3
 
 rm $srcdir/rsyslog.out.stats.log
 . $srcdir/diag.sh issue-HUP #reopen stats file
-. $srcdir/diag.sh wait-for-dyn-stats-reset 'rsyslog.out.stats.log' 'msg_stats'
+. $srcdir/diag.sh wait-for-stats-flush 'rsyslog.out.stats.log'
+. $srcdir/diag.sh block-stats-flush
 . $srcdir/diag.sh injectmsg-litteral $srcdir/testsuites/dynstats_input_more_2
-. $srcdir/diag.sh msleep 4100
-echo doing shutdown
-. $srcdir/diag.sh shutdown-when-empty
-echo wait on shutdown
-. $srcdir/diag.sh wait-shutdown
+. $srcdir/diag.sh wait-queueempty
+. $srcdir/diag.sh allow-single-stats-flush-after-block-and-wait-for-it
+
 . $srcdir/diag.sh content-check "foo 001 0"
 . $srcdir/diag.sh content-check "bar 002 0"
 . $srcdir/diag.sh content-check "baz 003 0"
@@ -62,6 +66,15 @@ echo wait on shutdown
 . $srcdir/diag.sh first-column-sum-check 's/.*new_metric_add=\([0-9]\+\)/\1/g' 'new_metric_add=' 'rsyslog.out.stats.log' 3
 . $srcdir/diag.sh first-column-sum-check 's/.*ops_overflow=\([0-9]\+\)/\1/g' 'ops_overflow=' 'rsyslog.out.stats.log' 1
 . $srcdir/diag.sh first-column-sum-check 's/.*no_metric=\([0-9]\+\)/\1/g' 'no_metric=' 'rsyslog.out.stats.log' 0
+
+. $srcdir/diag.sh allow-single-stats-flush-after-block-and-wait-for-it
+. $srcdir/diag.sh await-stats-flush-after-block
+
+echo doing shutdown
+. $srcdir/diag.sh shutdown-when-empty
+echo wait on shutdown
+. $srcdir/diag.sh wait-shutdown
+
 . $srcdir/diag.sh first-column-sum-check 's/.*metrics_purged=\([0-9]\+\)/\1/g' 'metrics_purged=' 'rsyslog.out.stats.log' 3
 
 . $srcdir/diag.sh custom-assert-content-missing 'foo' 'rsyslog.out.stats.log'
diff --git a/tests/dynstats_prevent_premature_eviction-vg.sh b/tests/dynstats_prevent_premature_eviction-vg.sh
new file mode 100755
index 000000000..3eba5f91c
--- /dev/null
+++ b/tests/dynstats_prevent_premature_eviction-vg.sh
@@ -0,0 +1,36 @@
+#!/bin/bash
+# added 2016-04-13 by singh.janmejay
+# This file is part of the rsyslog project, released under ASL 2.0
+echo ===============================================================================
+echo \[dynstats_prevent_premature_eviction-vg.sh\]: test for ensuring metrics are not evicted before unused-ttl with valgrind
+. $srcdir/diag.sh init
+. $srcdir/diag.sh startup-vg dynstats_reset.conf
+. $srcdir/diag.sh wait-for-stats-flush 'rsyslog.out.stats.log'
+. $srcdir/diag.sh block-stats-flush
+. $srcdir/diag.sh injectmsg-litteral $srcdir/testsuites/dynstats_input_1
+. $srcdir/diag.sh allow-single-stats-flush-after-block-and-wait-for-it
+. $srcdir/diag.sh injectmsg-litteral $srcdir/testsuites/dynstats_input_2
+. $srcdir/diag.sh allow-single-stats-flush-after-block-and-wait-for-it
+. $srcdir/diag.sh injectmsg-litteral $srcdir/testsuites/dynstats_input_3
+. $srcdir/diag.sh await-stats-flush-after-block
+. $srcdir/diag.sh wait-queueempty
+. $srcdir/diag.sh wait-for-stats-flush 'rsyslog.out.stats.log'
+. $srcdir/diag.sh content-check "foo 001 0"
+. $srcdir/diag.sh content-check "foo 006 0"
+echo doing shutdown
+. $srcdir/diag.sh shutdown-when-empty
+echo wait on shutdown
+. $srcdir/diag.sh wait-shutdown-vg
+. $srcdir/diag.sh check-exit-vg
+ # because dyn-accumulators for existing metrics were posted-to under a second, they should not have been evicted
+. $srcdir/diag.sh custom-content-check 'baz=2' 'rsyslog.out.stats.log'
+. $srcdir/diag.sh custom-content-check 'bar=1' 'rsyslog.out.stats.log'
+. $srcdir/diag.sh custom-content-check 'foo=3' 'rsyslog.out.stats.log'
+# sum is high because accumulators were never reset, and we expect them to last specific number of cycles(when we posted before ttl expiry)
+. $srcdir/diag.sh first-column-sum-check 's/.*foo=\([0-9]\+\)/\1/g' 'foo=' 'rsyslog.out.stats.log' 6
+. $srcdir/diag.sh first-column-sum-check 's/.*bar=\([0-9]\+\)/\1/g' 'bar=' 'rsyslog.out.stats.log' 1
+. $srcdir/diag.sh first-column-sum-check 's/.*baz=\([0-9]\+\)/\1/g' 'baz=' 'rsyslog.out.stats.log' 3
+. $srcdir/diag.sh first-column-sum-check 's/.*new_metric_add=\([0-9]\+\)/\1/g' 'new_metric_add=' 'rsyslog.out.stats.log' 3
+. $srcdir/diag.sh first-column-sum-check 's/.*ops_overflow=\([0-9]\+\)/\1/g' 'ops_overflow=' 'rsyslog.out.stats.log' 0
+. $srcdir/diag.sh first-column-sum-check 's/.*no_metric=\([0-9]\+\)/\1/g' 'no_metric=' 'rsyslog.out.stats.log' 0
+. $srcdir/diag.sh exit
diff --git a/tests/dynstats_prevent_premature_eviction.sh b/tests/dynstats_prevent_premature_eviction.sh
new file mode 100755
index 000000000..cec539078
--- /dev/null
+++ b/tests/dynstats_prevent_premature_eviction.sh
@@ -0,0 +1,34 @@
+#!/bin/bash
+# added 2016-04-13 by singh.janmejay
+# This file is part of the rsyslog project, released under ASL 2.0
+echo ===============================================================================
+echo \[dynstats_prevent_premature_eviction.sh\]: test for ensuring metrics are not evicted before unused-ttl
+. $srcdir/diag.sh init
+. $srcdir/diag.sh startup dynstats_reset.conf
+. $srcdir/diag.sh wait-for-stats-flush 'rsyslog.out.stats.log'
+. $srcdir/diag.sh msleep 800
+. $srcdir/diag.sh injectmsg-litteral $srcdir/testsuites/dynstats_input_1
+. $srcdir/diag.sh msleep 400
+. $srcdir/diag.sh injectmsg-litteral $srcdir/testsuites/dynstats_input_2
+. $srcdir/diag.sh msleep 900
+. $srcdir/diag.sh injectmsg-litteral $srcdir/testsuites/dynstats_input_3
+. $srcdir/diag.sh wait-queueempty
+. $srcdir/diag.sh wait-for-stats-flush 'rsyslog.out.stats.log'
+. $srcdir/diag.sh content-check "foo 001 0"
+. $srcdir/diag.sh content-check "foo 006 0"
+echo doing shutdown
+. $srcdir/diag.sh shutdown-when-empty
+echo wait on shutdown
+. $srcdir/diag.sh wait-shutdown
+ # because dyn-accumulators for existing metrics were posted-to under a second, they should not have been evicted
+. $srcdir/diag.sh custom-content-check 'baz=2' 'rsyslog.out.stats.log'
+. $srcdir/diag.sh custom-content-check 'bar=1' 'rsyslog.out.stats.log'
+. $srcdir/diag.sh custom-content-check 'foo=3' 'rsyslog.out.stats.log'
+# sum is high because accumulators were never reset, and we expect them to last specific number of cycles(when we posted before ttl expiry)
+. $srcdir/diag.sh first-column-sum-check 's/.*foo=\([0-9]\+\)/\1/g' 'foo=' 'rsyslog.out.stats.log' 6
+. $srcdir/diag.sh first-column-sum-check 's/.*bar=\([0-9]\+\)/\1/g' 'bar=' 'rsyslog.out.stats.log' 1
+. $srcdir/diag.sh first-column-sum-check 's/.*baz=\([0-9]\+\)/\1/g' 'baz=' 'rsyslog.out.stats.log' 3
+. $srcdir/diag.sh first-column-sum-check 's/.*new_metric_add=\([0-9]\+\)/\1/g' 'new_metric_add=' 'rsyslog.out.stats.log' 3
+. $srcdir/diag.sh first-column-sum-check 's/.*ops_overflow=\([0-9]\+\)/\1/g' 'ops_overflow=' 'rsyslog.out.stats.log' 0
+. $srcdir/diag.sh first-column-sum-check 's/.*no_metric=\([0-9]\+\)/\1/g' 'no_metric=' 'rsyslog.out.stats.log' 0
+. $srcdir/diag.sh exit
diff --git a/tests/dynstats_reset-vg.sh b/tests/dynstats_reset-vg.sh
index 9303afbee..391260b08 100755
--- a/tests/dynstats_reset-vg.sh
+++ b/tests/dynstats_reset-vg.sh
@@ -7,11 +7,11 @@ echo \[dynstats_reset-vg.sh\]: test for gathering stats with a known-dyn-metrics
 . $srcdir/diag.sh startup-vg dynstats_reset.conf
 . $srcdir/diag.sh wait-for-stats-flush 'rsyslog.out.stats.log'
 . $srcdir/diag.sh injectmsg-litteral $srcdir/testsuites/dynstats_input_1
-. $srcdir/diag.sh msleep 1100
+. $srcdir/diag.sh msleep 2100 #one second for unused-metrics to be kept under observation, another for them to be cleared off
 . $srcdir/diag.sh injectmsg-litteral $srcdir/testsuites/dynstats_input_2
-. $srcdir/diag.sh msleep 1100
+. $srcdir/diag.sh msleep 2100
 . $srcdir/diag.sh injectmsg-litteral $srcdir/testsuites/dynstats_input_3
-. $srcdir/diag.sh msleep 1100
+. $srcdir/diag.sh msleep 2100
 . $srcdir/diag.sh wait-queueempty
 . $srcdir/diag.sh content-check "foo 001 0"
 . $srcdir/diag.sh content-check "bar 002 0"
diff --git a/tests/dynstats_reset.sh b/tests/dynstats_reset.sh
index 708b4d7c5..84c43ee5f 100755
--- a/tests/dynstats_reset.sh
+++ b/tests/dynstats_reset.sh
@@ -7,11 +7,11 @@ echo \[dynstats_reset.sh\]: test for gathering stats with a known-dyn-metrics re
 . $srcdir/diag.sh startup dynstats_reset.conf
 . $srcdir/diag.sh wait-for-stats-flush 'rsyslog.out.stats.log'
 . $srcdir/diag.sh injectmsg-litteral $srcdir/testsuites/dynstats_input_1
-. $srcdir/diag.sh msleep 1100
+. $srcdir/diag.sh msleep 2100
 . $srcdir/diag.sh injectmsg-litteral $srcdir/testsuites/dynstats_input_2
-. $srcdir/diag.sh msleep 1100
+. $srcdir/diag.sh msleep 2100
 . $srcdir/diag.sh injectmsg-litteral $srcdir/testsuites/dynstats_input_3
-. $srcdir/diag.sh msleep 1100
+. $srcdir/diag.sh msleep 2100
 . $srcdir/diag.sh wait-queueempty
 . $srcdir/diag.sh content-check "foo 001 0"
 . $srcdir/diag.sh content-check "bar 002 0"
diff --git a/tests/testsuites/dynstats_overflow.conf b/tests/testsuites/dynstats_overflow.conf
index af8940dea..8ff343fe6 100644
--- a/tests/testsuites/dynstats_overflow.conf
+++ b/tests/testsuites/dynstats_overflow.conf
@@ -4,11 +4,11 @@ ruleset(name="stats") {
   action(type="omfile" file="./rsyslog.out.stats.log")
 }
 
-module(load="../plugins/impstats/.libs/impstats" interval="1" severity="7" resetCounters="on" Ruleset="stats" bracketing="on")
+module(load="../plugins/impstats/.libs/impstats" interval="2" severity="7" resetCounters="on" Ruleset="stats" bracketing="on")
 
 template(name="outfmt" type="string" string="%msg% %$.increment_successful%\n")
 
-dyn_stats(name="msg_stats" unusedMetricLife="4" maxCardinality="3")
+dyn_stats(name="msg_stats" unusedMetricLife="1" maxCardinality="3")
 
 set $.msg_prefix = field($msg, 32, 1);
 
diff --git a/tests/testsuites/dynstats_reset.conf b/tests/testsuites/dynstats_reset.conf
index 9ae36e67b..73fc50e2f 100644
--- a/tests/testsuites/dynstats_reset.conf
+++ b/tests/testsuites/dynstats_reset.conf
@@ -8,7 +8,7 @@ module(load="../plugins/impstats/.libs/impstats" interval="1" severity="7" reset
 
 template(name="outfmt" type="string" string="%msg% %$.increment_successful%\n")
 
-dyn_stats(name="msg_stats" unusedMetricLife="1")
+dyn_stats(name="msg_stats" unusedMetricLife="1" resettable="off")
 
 set $.msg_prefix = field($msg, 32, 1);