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096330c53b
In #50420 a few summary metrics were converted to histograms, but the Help text in a couple of them still referred to summaries. This fixes that help text. Signed-off-by: Dave Henderson <dave.henderson@grafana.com>
104 lines
3.5 KiB
Go
104 lines
3.5 KiB
Go
package httpclientprovider
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import (
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"net/http"
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sdkhttpclient "github.com/grafana/grafana-plugin-sdk-go/backend/httpclient"
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"github.com/grafana/grafana/pkg/infra/httpclient"
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"github.com/grafana/grafana/pkg/infra/metrics/metricutil"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promauto"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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)
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var (
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datasourceRequestCounter = promauto.NewCounterVec(
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prometheus.CounterOpts{
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Namespace: "grafana",
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Name: "datasource_request_total",
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Help: "A counter for outgoing requests for a data source",
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},
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[]string{"datasource", "code", "method"},
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)
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datasourceRequestHistogram = promauto.NewHistogramVec(
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prometheus.HistogramOpts{
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Namespace: "grafana",
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Name: "datasource_request_duration_seconds",
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Help: "histogram of durations of outgoing data source requests sent from Grafana",
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Buckets: []float64{.005, .01, .025, .05, .1, .25, .5, 1, 2.5, 5, 10, 25, 50, 100},
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}, []string{"datasource", "code", "method"},
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)
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datasourceResponseHistogram = promauto.NewHistogramVec(
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prometheus.HistogramOpts{
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Namespace: "grafana",
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Name: "datasource_response_size_bytes",
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Help: "histogram of data source response sizes returned to Grafana",
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Buckets: []float64{128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, 524288, 1048576},
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}, []string{"datasource"},
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)
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datasourceRequestsInFlight = promauto.NewGaugeVec(
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prometheus.GaugeOpts{
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Namespace: "grafana",
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Name: "datasource_request_in_flight",
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Help: "A gauge of outgoing data source requests currently being sent by Grafana",
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},
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[]string{"datasource"},
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)
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)
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const DataSourceMetricsMiddlewareName = "metrics"
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var executeMiddlewareFunc = executeMiddleware
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func DataSourceMetricsMiddleware() sdkhttpclient.Middleware {
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return sdkhttpclient.NamedMiddlewareFunc(DataSourceMetricsMiddlewareName, func(opts sdkhttpclient.Options, next http.RoundTripper) http.RoundTripper {
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if opts.Labels == nil {
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return next
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}
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datasourceName, exists := opts.Labels["datasource_name"]
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if !exists {
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return next
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}
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datasourceLabelName, err := metricutil.SanitizeLabelName(datasourceName)
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// if the datasource named cannot be turned into a prometheus
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// label we will skip instrumenting these metrics.
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if err != nil {
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return next
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}
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datasourceLabel := prometheus.Labels{"datasource": datasourceLabelName}
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return executeMiddlewareFunc(next, datasourceLabel)
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})
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}
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func executeMiddleware(next http.RoundTripper, datasourceLabel prometheus.Labels) http.RoundTripper {
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return sdkhttpclient.RoundTripperFunc(func(r *http.Request) (*http.Response, error) {
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requestCounter := datasourceRequestCounter.MustCurryWith(datasourceLabel)
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requestHistogram := datasourceRequestHistogram.MustCurryWith(datasourceLabel)
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requestInFlight := datasourceRequestsInFlight.With(datasourceLabel)
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responseSizeHistogram := datasourceResponseHistogram.With(datasourceLabel)
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res, err := promhttp.InstrumentRoundTripperDuration(requestHistogram,
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promhttp.InstrumentRoundTripperCounter(requestCounter,
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promhttp.InstrumentRoundTripperInFlight(requestInFlight, next))).
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RoundTrip(r)
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if err != nil {
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return nil, err
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}
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if res != nil && res.StatusCode != http.StatusSwitchingProtocols {
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res.Body = httpclient.CountBytesReader(res.Body, func(bytesRead int64) {
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responseSizeHistogram.Observe(float64(bytesRead))
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})
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}
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return res, nil
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})
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}
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