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derp: export current file descriptor metric

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This commit is contained in:
Brad Fitzpatrick 2021-08-29 15:17:34 -07:00
parent 5d3427021b
commit ffd22050c0
1 changed files with 9 additions and 0 deletions
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9
derp/derp_server.go
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@ -1380,11 +1380,20 @@ func (s *Server) expVarFunc(f func() interface{}) expvar.Func {
})
}
func currentFDs() int {
// TODO(bradfitz): this could be more efficient, without making so much
// garbage. Probably doesn't matter but a Linux-only fast path would be
// reasonable for us using something like goimport's fastwalk.
ents, _ := os.ReadDir("/proc/self/fd")
return len(ents)
}
// ExpVar returns an expvar variable suitable for registering with expvar.Publish.
func (s *Server) ExpVar() expvar.Var {
m := new(metrics.Set)
m.Set("gauge_memstats_sys0", expvar.Func(func() interface{} { return int64(s.memSys0) }))
m.Set("gauge_watchers", s.expVarFunc(func() interface{} { return len(s.watchers) }))
m.Set("gauge_current_file_descriptors", expvar.Func(func() interface{} { return currentFDs() }))
m.Set("gauge_current_connections", &s.curClients)
m.Set("gauge_current_home_connections", &s.curHomeClients)
m.Set("gauge_clients_total", expvar.Func(func() interface{} { return len(s.clientsMesh) }))