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fix: TTFB prometheus metrics calculation (#11082)

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until now metrics was reporting entire call
duration instead of ttfb's this PR fixes it
This commit is contained in:
Harshavardhana 2020-12-10 23:02:25 -08:00 committed by GitHub
parent 14792cdbc6
commit 3a0082f0f1
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 4 additions and 12 deletions
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8
cmd/handler-utils.go
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@ -29,7 +29,6 @@ import (
"net/url"
"regexp"
"strings"
"time"
xhttp "github.com/minio/minio/cmd/http"
"github.com/minio/minio/cmd/logger"
@ -379,12 +378,7 @@ func collectAPIStats(api string, f http.HandlerFunc) http.HandlerFunc {
f.ServeHTTP(statsWriter, r)
// Time duration in secs since the call started.
// We don't need to do nanosecond precision in this
// simply for the fact that it is not human readable.
durationSecs := time.Since(statsWriter.StartTime).Seconds()
globalHTTPStats.updateStats(api, r, statsWriter, durationSecs)
globalHTTPStats.updateStats(api, r, statsWriter)
}
}

6
cmd/http-stats.go
View File

@ -161,7 +161,7 @@ func (st *HTTPStats) toServerHTTPStats() ServerHTTPStats {
}
// Update statistics from http request and response data
func (st *HTTPStats) updateStats(api string, r *http.Request, w *logger.ResponseWriter, durationSecs float64) {
func (st *HTTPStats) updateStats(api string, r *http.Request, w *logger.ResponseWriter) {
// A successful request has a 2xx response code
successReq := (w.StatusCode >= 200 && w.StatusCode < 300)
@ -172,10 +172,8 @@ func (st *HTTPStats) updateStats(api string, r *http.Request, w *logger.Response
}
}
if r.Method == http.MethodGet {
// Increment the prometheus http request response histogram with appropriate label
httpRequestsDuration.With(prometheus.Labels{"api": api}).Observe(durationSecs)
}
httpRequestsDuration.With(prometheus.Labels{"api": api}).Observe(w.TimeToFirstByte.Seconds())
}
// Prepare new HTTPStats structure