mudhorn/prometheus
1
0
Fork 0
mirror of https://github.com/prometheus/prometheus.git synced 2025-01-23 11:41:54 -08:00
Code Issues Actions 8 Packages Projects Releases Wiki Activity

Adding new metric type to track in-flight queries via the remote read API endpoint. (#4699)

Browse source 
* Adding new metric type to track in-flight queries via the remote read API endpoint.

Signed-off-by: tariqibrahim <tariq.ibrahim@microsoft.com>

* fix review comments

Signed-off-by: tariqibrahim <tariq.ibrahim@microsoft.com>

* fix comments

Signed-off-by: tariqibrahim <tariq.ibrahim@microsoft.com>
This commit is contained in:
Tariq Ibrahim 2018-10-10 16:09:08 -07:00 committed by Goutham Veeramachaneni
parent 3f7ed7de49
commit d371697841
1 changed files with 21 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

25
web/api/v1/api.go
View file

@ -31,6 +31,7 @@ import (
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
jsoniter "github.com/json-iterator/go"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/model"
"github.com/prometheus/common/route"
"github.com/prometheus/tsdb"
@ -51,6 +52,11 @@ import (
tsdbLabels "github.com/prometheus/tsdb/labels"
)
const (
namespace = "prometheus"
subsystem = "api"
)
type status string
const (
@ -78,6 +84,13 @@ var corsHeaders = map[string]string{
"Access-Control-Expose-Headers": "Date",
}
var remoteReadQueries = prometheus.NewGauge(prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "remote_read_queries",
Help: "The current number of remote read queries being executed or waiting.",
})
type apiError struct {
typ errorType
err error
@ -139,6 +152,11 @@ type API struct {
remoteReadGate *gate.Gate
}
func init() {
jsoniter.RegisterTypeEncoderFunc("promql.Point", marshalPointJSON, marshalPointJSONIsEmpty)
prometheus.MustRegister(remoteReadQueries)
}
// NewAPI returns an initialized API type.
func NewAPI(
qe *promql.Engine,
@ -762,7 +780,10 @@ func (api *API) serveFlags(r *http.Request) (interface{}, *apiError, func()) {
func (api *API) remoteRead(w http.ResponseWriter, r *http.Request) {
api.remoteReadGate.Start(r.Context())
remoteReadQueries.Inc()
defer api.remoteReadGate.Done()
defer remoteReadQueries.Dec()
req, err := remote.DecodeReadRequest(r)
if err != nil {
@ -1083,10 +1104,6 @@ func parseDuration(s string) (time.Duration, error) {
return 0, fmt.Errorf("cannot parse %q to a valid duration", s)
}
func init() {
jsoniter.RegisterTypeEncoderFunc("promql.Point", marshalPointJSON, marshalPointJSONIsEmpty)
}
func marshalPointJSON(ptr unsafe.Pointer, stream *jsoniter.Stream) {
p := *((*promql.Point)(ptr))
stream.WriteArrayStart()