Disable azure_scheduledevent_request by default

Enable env METRICS_REQUESTSTATS=1 by default

Author: mblaschke

README.md

@@ -22,6 +22,7 @@ Normally no configuration is needed but can be customized using environment vari
 | `API_ERROR_THRESHOLD`  | `0` (disabled)                                                            | API error threshold after which app will panic (`0` = dislabed)   |
 | `SCRAPE_TIME`          | `1m` (time.Duration)                                                      | Time between API calls                                            |
 | `SERVER_BIND`          | `:8080`                                                                   | IP/Port binding                                                   |
+| `METRICS_REQUESTSTATS` | `empty`                                                                   | Enable metric `azure_scheduledevent_request`                      |
 
 
 Metrics
@@ -31,7 +32,7 @@ Metrics
 |---------------------------------------------|---------------------------------------------------------------------------------------|
 | `azure_scheduledevent_document_incarnation` | Document incarnation number (version)                                                 |
 | `azure_scheduledevent_event`                | Fetched events from API                                                               |
-| `azure_scheduledevent_request`              | Request histogram (count and request duration)                                        |
+| `azure_scheduledevent_request`              | Request histogram (count and request duration; disabled by default)                   |
 | `azure_scheduledevent_request_error`        | Counter for failed requests                                                           |
 
 

main.go

@@ -31,6 +31,9 @@ var opts struct {
 	ApiUrl            string        `long:"api-url"             env:"API_URL"       description:"Azure ScheduledEvents API URL" default:"http://169.254.169.254/metadata/scheduledevents?api-version=2017-11-01"`
 	ApiTimeout        time.Duration `long:"api-timeout"         env:"API_TIMEOUT"   description:"Azure API timeout (seconds)"   default:"30s"`
 	ApiErrorThreshold int           `long:"api-error-threshold" env:"API_ERROR_THRESHOLD"   description:"Azure API error threshold (after which app will panic)"   default:"0"`
+
+	// metrics
+	MetricsRequestStats bool `long:"metrics-requeststats" env:"METRICS_REQUESTSTATS" description:"Enable request stats metrics"`
 }
 
 func main() {

metrics.go

@@ -181,8 +181,10 @@ func fetchApiUrl() (*AzureScheduledEventResponse, error) {
 		return nil, err
 	}
 
-	duration := time.Now().Sub(startTime)
-	scheduledEventRequest.With(prometheus.Labels{}).Observe(duration.Seconds())
+	if opts.MetricsRequestStats {
+		duration := time.Now().Sub(startTime)
+		scheduledEventRequest.With(prometheus.Labels{}).Observe(duration.Seconds())
+	}
 
 	return ret, nil
 }