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app/vmselect: add a placeholder for /api/v1/metadata, which could be requested by Grafana

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See https://prometheus.io/docs/prometheus/latest/querying/api/#querying-metric-metadata

VictoriaMetrics doesn't collect any metadata for metrics, so just return empty response.
This commit is contained in:
Aliaksandr Valialkin 2020-02-04 15:53:15 +02:00
parent 7cde594696
commit e6bf88a4d4
1 changed files with 9 additions and 2 deletions
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11
app/vmselect/main.go
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@ -263,6 +263,12 @@ func selectHandler(w http.ResponseWriter, r *http.Request, p *httpserver.Path, a
w.Header().Set("Content-Type", "application/json") w.Header().Set("Content-Type", "application/json")
fmt.Fprintf(w, "%s", `{"status":"success","data":{"alerts":[]}}`) fmt.Fprintf(w, "%s", `{"status":"success","data":{"alerts":[]}}`)
return true return true
case "prometheus/api/v1/metadata":
// Return dumb placeholder
metadataRequests.Inc()
w.Header().Set("Content-Type", "application/json")
fmt.Fprintf(w, "%s", `{"status":"success","data":{}}`)
return true
default: default:
return false return false
} }
@ -327,6 +333,7 @@ var (
federateRequests = metrics.NewCounter(`vm_http_requests_total{path="/select/{}/prometheus/federate"}`) federateRequests = metrics.NewCounter(`vm_http_requests_total{path="/select/{}/prometheus/federate"}`)
federateErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/select/{}/prometheus/federate"}`) federateErrors = metrics.NewCounter(`vm_http_request_errors_total{path="/select/{}/prometheus/federate"}`)
rulesRequests = metrics.NewCounter(`vm_http_requests_total{path="/select/{}/prometheus/api/v1/rules"}`) rulesRequests = metrics.NewCounter(`vm_http_requests_total{path="/select/{}/prometheus/api/v1/rules"}`)
alertsRequests = metrics.NewCounter(`vm_http_requests_total{path="/select/{}/prometheus/api/v1/alerts"}`) alertsRequests = metrics.NewCounter(`vm_http_requests_total{path="/select/{}/prometheus/api/v1/alerts"}`)
metadataRequests = metrics.NewCounter(`vm_http_requests_total{path="/select/{}/prometheus/api/v1/metadata"}`)
) )