Added matchers in listLokiLabelValues

tools/loki.go

@@ -256,6 +256,7 @@ type ListLokiLabelValuesParams struct {
 	LabelName     string `json:"labelName" jsonschema:"required,description=The name of the label to retrieve values for (e.g. 'app'\\, 'env'\\, 'pod')"`
 	StartRFC3339  string `json:"startRfc3339,omitempty" jsonschema:"description=Optionally\\, the start time of the query in RFC3339 format (defaults to 1 hour ago)"`
 	EndRFC3339    string `json:"endRfc3339,omitempty" jsonschema:"description=Optionally\\, the end time of the query in RFC3339 format (defaults to now)"`
+	Matchers      string `json:"matchers"`
 }
 
 // listLokiLabelValues lists all values for a specific label in a Loki datasource
@@ -265,16 +266,21 @@ func listLokiLabelValues(ctx context.Context, args ListLokiLabelValuesParams) ([
 		return nil, fmt.Errorf("creating Loki client: %w", err)
 	}
 
-	// Use the client's fetchData method
 	urlPath := fmt.Sprintf("/loki/api/v1/label/%s/values", args.LabelName)
 
+	// Manually include matchers in query string if provided
+	if args.Matchers != "" {
+		encoded := url.QueryEscape(args.Matchers)
+		urlPath = fmt.Sprintf("%s?query=%s", urlPath, encoded)
+	}
+
+	// Call the original fetchData with start/end as before
 	result, err := client.fetchData(ctx, urlPath, args.StartRFC3339, args.EndRFC3339)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("fetching label values: %w", err)
 	}
 
 	if len(result) == 0 {
-		// Return empty slice instead of nil
 		return []string{}, nil
 	}