Prevent negative lag in pmp-check-mysql-replication-delay

Author: wilfriedroset

nagios/bin/pmp-check-mysql-replication-delay

@@ -91,6 +91,9 @@ main() {
    # Check for SQL thread errors
    LAST_SLAVE_ERRNO=$(awk '/Last_SQL_Errno/{print $2}' "${TEMP_SLAVEDATA}")
 
+   # Prevent Negative value due to NTP
+   # Keep the highest value between 0 and level
+   LEVEL=$([ "$LEVEL:-0" -le "0" ] && echo 0 || echo $LEVEL)
    # Build the common perf data output for graph trending
    PERFDATA="replication_delay=${LEVEL:-0};${OPT_WARN};${OPT_CRIT};0;"