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monitoring: Add OpenMetrics exporter

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This patch makes chasquid's monitoring server expose an OpenMetrics
metrics endpoint.

It adds a new package "expvarom" which implements an HTTP handler that
exports expvar variables in the OpenMetrics text format.

Then, the handler is registered by the monitoring server at /metrics
(where most things expect it to be).

The existing exported variables are also extended with descriptions,
which is optional, but improves the readability of the metrics.
This commit is contained in:
Alberto Bertogli
2020-08-19 20:42:28 +01:00
parent 7e412db19b
commit 7fe42a368a
12 changed files with 447 additions and 154 deletions
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35
internal/sts/sts.go
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@@ -12,7 +12,6 @@ import (
"context"
"encoding/json"
"errors"
"expvar"
"fmt"
"io"
"io/ioutil"
@@ -25,6 +24,7 @@ import (
"sync"
"time"
"blitiri.com.ar/go/chasquid/internal/expvarom"
"blitiri.com.ar/go/chasquid/internal/safeio"
"blitiri.com.ar/go/chasquid/internal/trace"
@@ -34,20 +34,31 @@ import (
// Exported variables.
var (
cacheFetches = expvar.NewInt("chasquid/sts/cache/fetches")
cacheHits = expvar.NewInt("chasquid/sts/cache/hits")
cacheExpired = expvar.NewInt("chasquid/sts/cache/expired")
cacheFetches = expvarom.NewInt("chasquid/sts/cache/fetches",
"count of total fetches in the STS cache")
cacheHits = expvarom.NewInt("chasquid/sts/cache/hits",
"count of hits in the STS cache")
cacheExpired = expvarom.NewInt("chasquid/sts/cache/expired",
"count of expired entries in the STS cache")
cacheIOErrors = expvar.NewInt("chasquid/sts/cache/ioErrors")
cacheFailedFetch = expvar.NewInt("chasquid/sts/cache/failedFetch")
cacheInvalid = expvar.NewInt("chasquid/sts/cache/invalid")
cacheIOErrors = expvarom.NewInt("chasquid/sts/cache/ioErrors",
"count of I/O errors when maintaining STS cache")
cacheFailedFetch = expvarom.NewInt("chasquid/sts/cache/failedFetch",
"count of failed fetches in the STS cache")
cacheInvalid = expvarom.NewInt("chasquid/sts/cache/invalid",
"count of invalid policies in the STS cache")
cacheMarshalErrors = expvar.NewInt("chasquid/sts/cache/marshalErrors")
cacheUnmarshalErrors = expvar.NewInt("chasquid/sts/cache/unmarshalErrors")
cacheMarshalErrors = expvarom.NewInt("chasquid/sts/cache/marshalErrors",
"count of marshalling errors when maintaining STS cache")
cacheUnmarshalErrors = expvarom.NewInt("chasquid/sts/cache/unmarshalErrors",
"count of unmarshalling errors in STS cache")
cacheRefreshCycles = expvar.NewInt("chasquid/sts/cache/refreshCycles")
cacheRefreshes = expvar.NewInt("chasquid/sts/cache/refreshes")
cacheRefreshErrors = expvar.NewInt("chasquid/sts/cache/refreshErrors")
cacheRefreshCycles = expvarom.NewInt("chasquid/sts/cache/refreshCycles",
"count of STS cache refresh cycles")
cacheRefreshes = expvarom.NewInt("chasquid/sts/cache/refreshes",
"count of STS cache refreshes")
cacheRefreshErrors = expvarom.NewInt("chasquid/sts/cache/refreshErrors",
"count of STS cache refresh errors")
)
// Policy represents a parsed policy.