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Add expvarz to http endpoints #7469

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Merged
neilalexander merged 1 commit into from
Oct 27, 2025
+8 −1
Merged

Add expvarz to http endpoints #7469

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4 changes: 3 additions & 1 deletion server/monitor.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1501,7 +1501,8 @@ func (s *Server) HandleRoot(w http.ResponseWriter, r *http.Request) {
<a href=.%s>LeafNodes<span class="endpoint"> %s</span></a>
<a href=.%s>Gateways<span class="endpoint"> %s</span></a>
<a href=.%s>Raft Groups<span class="endpoint"> %s</span></a>
<a href=.%s class=last>Health Probe<span class="endpoint"> %s</span></a>
<a href=.%s>Health Probe<span class="endpoint"> %s</span></a>
<a href=.%s class=last>Expvar<span class="endpoint"> %s</span></a>
<a href=https://docs.nats.io/running-a-nats-service/nats_admin/monitoring class="help">Help</a>
</body>
</html>`,
Expand All @@ -1518,6 +1519,7 @@ func (s *Server) HandleRoot(w http.ResponseWriter, r *http.Request) {
s.basePath(GatewayzPath), GatewayzPath,
s.basePath(RaftzPath), RaftzPath,
s.basePath(HealthzPath), HealthzPath,
s.basePath(ExpvarzPath), ExpvarzPath,
)
}

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5 changes: 5 additions & 0 deletions server/server.go
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Expand Up @@ -44,6 +44,8 @@ import (
// Allow dynamic profiling.
_ "net/http/pprof"

"expvar"

"github.com/klauspost/compress/s2"
"github.com/nats-io/jwt/v2"
"github.com/nats-io/nats-server/v2/logger"
Expand Down Expand Up @@ -3017,6 +3019,7 @@ const (
HealthzPath = "/healthz"
IPQueuesPath = "/ipqueuesz"
RaftzPath = "/raftz"
ExpvarzPath = "/debug/vars"
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MauriceVanVeen marked this conversation as resolved.
)

func (s *Server) basePath(p string) string {
Expand Down Expand Up @@ -3135,6 +3138,8 @@ func (s *Server) startMonitoring(secure bool) error {
mux.HandleFunc(s.basePath(IPQueuesPath), s.HandleIPQueuesz)
// Raftz
mux.HandleFunc(s.basePath(RaftzPath), s.HandleRaftz)
// Expvarz
mux.Handle(s.basePath(ExpvarzPath), expvar.Handler())

// Do not set a WriteTimeout because it could cause cURL/browser
// to return empty response or unable to display page if the
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