feat: added loggining to check error

checker/fetch.go

@@ -35,11 +35,17 @@ func (triggerChecker *TriggerChecker) fetch() (map[string][]metricSource.MetricD
 		targetIndex++ // increasing target index to have target names started from 1 instead of 0
 		fetchResult, err := triggerChecker.source.Fetch(target, triggerChecker.from, triggerChecker.until, isSimpleTrigger)
 		if err != nil {
+			triggerChecker.logger.Warning("NOVARIABLES triggerChecker.source.Fetch ID: %s, ERROR: %v, ",
+				triggerChecker.trigger.ID, err)
 			return nil, nil, err
 		}
 		metricsData := fetchResult.GetMetricsData()
 
 		metricsFetchResult, metricsErr := fetchResult.GetPatternMetrics()
+		if metricsErr != nil {
+			triggerChecker.logger.Warning("NOVARIABLES GetPatternMetrics ID: %s, ERROR: %v, ",
+				triggerChecker.trigger.ID, metricsErr)
+		}
 
 		if metricsErr == nil {
 			metricsArr = append(metricsArr, metricsFetchResult...)

metric_source/local/local.go

@@ -45,14 +45,15 @@ func (local *Local) Fetch(target string, from int64, until int64, allowRealTimeA
 		expr2, _, err := parser.ParseExpr(target)
 		if err != nil {
 			return nil, ErrParseExpr{
-				internalError: err,
+				internalError: fmt.Errorf("parser.ParseExpr %v", err),
 				target:        target,
 			}
 		}
 		patterns := expr2.Metrics()
 		metricsMap, metrics, err := getPatternsMetricData(local.dataBase, patterns, from, until, allowRealTimeAlerting)
 		if err != nil {
-			return nil, err
+			//return nil, err
+			return nil, fmt.Errorf("getPatternsMetricData: %v", err)
 		}
 		rewritten, newTargets, err := expr.RewriteExpr(expr2, from, until, metricsMap)
 		if err != nil && err != parser.ErrSeriesDoesNotExist {
@@ -76,14 +77,15 @@ func (local *Local) Fetch(target string, from int64, until int64, allowRealTimeA
 					} else {
 						err = ErrEvalExpr{
 							target:        target,
-							internalError: err,
+							internalError: fmt.Errorf("ErrEvalExpr %v", err),
 						}
 					}
 				}
 				return result, err
 			}()
 			if err != nil {
-				return nil, err
+				//return nil, err
+				return nil, fmt.Errorf("metricsData: %v", err)
 			}
 			for _, metricData := range metricsData {
 				md := *metricData