Added support for differing metrics path for Prometheus to Mentix (#875)

pkg/mentix/config/ids.go

@@ -26,3 +26,7 @@ const (
 	ExporterIDWebAPI           = "webapi"
 	ExporterIDPrometheusFileSD = "prom_filesd"
 )
+
+const (
+	PropertyMetricsPath = "metrics_path"
+)

pkg/mentix/exporters/promfilesd.go

@@ -110,12 +110,19 @@ func (exporter *PrometheusFileSDExporter) createScrapeConfigs() []*prometheus.Sc
 }
 
 func (exporter *PrometheusFileSDExporter) createScrapeConfig(site *meshdata.Site, host string, endpoint *meshdata.ServiceEndpoint) *prometheus.ScrapeConfig {
+	labels := map[string]string{
+		"site":         site.Name,
+		"service_type": endpoint.Type.Name,
+	}
+
+	// If a metrics path was specified as a property, use that one by setting the corresponding label
+	if metricsPath := endpoint.GetPropertyValue(config.PropertyMetricsPath, ""); len(metricsPath) > 0 {
+		labels["__metrics_path__"] = metricsPath
+	}
+
 	return &prometheus.ScrapeConfig{
 		Targets: []string{host},
-		Labels: map[string]string{
-			"site":         site.Name,
-			"service_type": endpoint.Type.Name,
-		},
+		Labels:  labels,
 	}
 }
 

pkg/mentix/meshdata/service.go

@@ -18,6 +18,8 @@
 
 package meshdata
 
+import "strings"
+
 // Service represents a service managed by Mentix.
 type Service struct {
 	ServiceEndpoint
@@ -40,3 +42,14 @@ type ServiceEndpoint struct {
 	IsMonitored bool
 	Properties  map[string]string
 }
+
+// GetPropertyValue performs a case-insensitive search for the given property.
+func (endpoint *ServiceEndpoint) GetPropertyValue(id string, defValue string) string {
+	for key := range endpoint.Properties {
+		if strings.EqualFold(key, id) {
+			return endpoint.Properties[key]
+		}
+	}
+
+	return defValue
+}