queue: emit better warning messages on queue param mismatch

We silently adjust some queue parameters if they are set invalidly. At
least for some important settings are now warning messages emitted.

Author: rgerhards

runtime/queue.c

@@ -3296,6 +3296,13 @@ qqueueCorrectParams(qqueue_t *pThis)
 		if(pThis->iHighWtrMrk == 0) { /* guard against very low max queue sizes! */
 			pThis->iHighWtrMrk = pThis->iMaxQueueSize;
 		}
+		LogMsg(0, RS_RET_CONF_PARSE_WARNING, LOG_WARNING,
+				"queue \"%s\": queue.highWaterMark "
+				"is set below queue size. It has been automatically been "
+				"adjusted to %d. In any case, we strongly recommend to review the "
+				"queue definition and resolve inconsistencies to guarantee "
+				"the config really matches your intent.",
+				obj.GetName((obj_t*) pThis), pThis->iHighWtrMrk);
 	}
 	if(   pThis->iLowWtrMrk < 2
 	   || pThis->iLowWtrMrk > pThis->iMaxQueueSize
@@ -3304,6 +3311,13 @@ qqueueCorrectParams(qqueue_t *pThis)
 		if(pThis->iLowWtrMrk == 0) {
 			pThis->iLowWtrMrk = 1;
 		}
+		LogMsg(0, RS_RET_CONF_PARSE_WARNING, LOG_WARNING,
+				"queue \"%s\": queue.lowWaterMark "
+				"is set below queue size or highWaterMark. It has been automatically been "
+				"adjusted to %d. In any case, we strongly recommend to review the "
+				"queue definition and resolve inconsistencies to guarantee "
+				"the config really matches your intent.",
+				obj.GetName((obj_t*) pThis), pThis->iHighWtrMrk);
 	}
 
 	if((pThis->iMinMsgsPerWrkr < 1