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feat(support): add client magicsock and agent prometheus metrics to support bundle (#12604)

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* feat(codersdk): add ability to fetch prometheus metrics directly from agent
* feat(support): add client magicsock and agent prometheus metrics to support bundle
* refactor(support): simplify AgentInfo control flow

Co-authored-by: Mathias Fredriksson <mafredri@gmail.com>
This commit is contained in:
Cian Johnston
2024-03-15 15:33:49 +00:00
committed by GitHub
parent 4d9e6c0134
commit b0c4e7504c
8 changed files with 187 additions and 108 deletions
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25
agent/agent.go
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@ -25,6 +25,7 @@ import (
"github.com/go-chi/chi/v5"
"github.com/google/uuid"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/expfmt"
"github.com/spf13/afero"
"go.uber.org/atomic"
"golang.org/x/exp/slices"
@ -34,6 +35,7 @@ import (
"tailscale.com/net/speedtest"
"tailscale.com/tailcfg"
"tailscale.com/types/netlogtype"
"tailscale.com/util/clientmetric"
"cdr.dev/slog"
"github.com/coder/retry"
@ -1980,3 +1982,26 @@ func (a *apiConnRoutineManager) start(name string, b gracefulShutdownBehavior, f
func (a *apiConnRoutineManager) wait() error {
return a.eg.Wait()
}
func PrometheusMetricsHandler(prometheusRegistry *prometheus.Registry, logger slog.Logger) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/plain")
// Based on: https://github.com/tailscale/tailscale/blob/280255acae604796a1113861f5a84e6fa2dc6121/ipn/localapi/localapi.go#L489
clientmetric.WritePrometheusExpositionFormat(w)
metricFamilies, err := prometheusRegistry.Gather()
if err != nil {
logger.Error(context.Background(), "prometheus handler failed to gather metric families", slog.Error(err))
return
}
for _, metricFamily := range metricFamilies {
_, err = expfmt.MetricFamilyToText(w, metricFamily)
if err != nil {
logger.Error(context.Background(), "expfmt.MetricFamilyToText failed", slog.Error(err))
return
}
}
})
}