Don't take over of Percona Server slow log roation if slow log rotation is disabled.

Author: arvenil

qan/analyzer/mysql/analyzer.go

@@ -165,6 +165,11 @@ func (a *RealAnalyzer) TakeOverPerconaServerRotation() error {
 	a.logger.Debug("TakeOverPerconaServerRotation:call")
 	defer a.logger.Debug("TakeOverPerconaServerRotation:return")
 
+	// If slow log rotation is disabled, don't take over Percona Server slow log rotation.
+	if !boolValue(a.config.SlowLogRotation) {
+		return nil
+	}
+
 	// max_slowlog_size: https://www.percona.com/doc/percona-server/LATEST/flexibility/slowlog_rotation.html#max_slowlog_size
 	maxSlowLogSizeNullInt64, err := a.mysqlConn.GetGlobalVarInteger("max_slowlog_size")
 	if err != nil {
@@ -451,3 +456,12 @@ func (a *RealAnalyzer) runWorker(interval *iter.Interval) {
 		a.logger.Warn("Lost report:", err)
 	}
 }
+
+// boolValue returns the value of the bool pointer passed in or
+// false if the pointer is nil.
+func boolValue(v *bool) bool {
+	if v != nil {
+		return *v
+	}
+	return false
+}