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package metrics
import (
"net/http"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
const (
namespace = "gitlab_shell"
sshdSubsystem = "sshd"
httpSubsystem = "http"
httpInFlightRequestsMetricName = "in_flight_requests"
httpRequestsTotalMetricName = "requests_total"
httpRequestDurationSecondsMetricName = "request_duration_seconds"
sshdConnectionsInFlightName = "in_flight_connections"
sshdConnectionDuration = "connection_duration_seconds"
sshdHitMaxSessions = "concurrent_limited_sessions_total"
)
var (
SshdConnectionDuration = promauto.NewHistogram(
prometheus.HistogramOpts{
Namespace: namespace,
Subsystem: sshdSubsystem,
Name: sshdConnectionDuration,
Help: "A histogram of latencies for connections to gitlab-shell sshd.",
Buckets: []float64{
0.005, /* 5ms */
0.025, /* 25ms */
0.1, /* 100ms */
0.5, /* 500ms */
1.0, /* 1s */
10.0, /* 10s */
30.0, /* 30s */
60.0, /* 1m */
300.0, /* 5m */
},
},
)
SshdConnectionsInFlight = promauto.NewGauge(
prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: sshdSubsystem,
Name: sshdConnectionsInFlightName,
Help: "A gauge of connections currently being served by gitlab-shell sshd.",
},
)
SshdHitMaxSessions = promauto.NewCounter(
prometheus.CounterOpts{
Namespace: namespace,
Subsystem: sshdSubsystem,
Name: sshdHitMaxSessions,
Help: "The number of times the concurrent sessions limit was hit in gitlab-shell sshd.",
},
)
// The metrics and the buckets size are similar to the ones we have for handlers in Labkit
// When the MR: https://gitlab.com/gitlab-org/labkit/-/merge_requests/150 is merged,
// these metrics can be refactored out of Gitlab Shell code by using the helper function from Labkit
httpRequestsTotal = promauto.NewCounterVec(
prometheus.CounterOpts{
Namespace: namespace,
Subsystem: httpSubsystem,
Name: httpRequestsTotalMetricName,
Help: "A counter for http requests.",
},
[]string{"code", "method"},
)
httpRequestDurationSeconds = promauto.NewHistogramVec(
prometheus.HistogramOpts{
Namespace: namespace,
Subsystem: httpSubsystem,
Name: httpRequestDurationSecondsMetricName,
Help: "A histogram of latencies for http requests.",
Buckets: []float64{
0.005, /* 5ms */
0.025, /* 25ms */
0.1, /* 100ms */
0.5, /* 500ms */
1.0, /* 1s */
10.0, /* 10s */
30.0, /* 30s */
60.0, /* 1m */
300.0, /* 5m */
},
},
[]string{"code", "method"},
)
httpInFlightRequests = promauto.NewGauge(
prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: httpSubsystem,
Name: httpInFlightRequestsMetricName,
Help: "A gauge of requests currently being performed.",
},
)
)
func NewRoundTripper(next http.RoundTripper) promhttp.RoundTripperFunc {
rt := next
rt = promhttp.InstrumentRoundTripperCounter(httpRequestsTotal, rt)
rt = promhttp.InstrumentRoundTripperDuration(httpRequestDurationSeconds, rt)
return promhttp.InstrumentRoundTripperInFlight(httpInFlightRequests, rt)
}
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