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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
//go:build !ts_omit_health && !ts_omit_usermetrics
package health
import (
"expvar"
"tailscale.com/feature/buildfeatures"
"tailscale.com/util/usermetric"
)
const MetricLabelWarning = "warning"
type metricHealthMessageLabel struct {
// TODO: break down by warnable.severity as well?
Type string
}
// SetMetricsRegistry sets up the metrics for the Tracker. It takes
// a usermetric.Registry and registers the metrics there.
func (t *Tracker) SetMetricsRegistry(reg *usermetric.Registry) {
if !buildfeatures.HasHealth {
return
}
if reg == nil || t.metricHealthMessage != nil {
return
}
m := usermetric.NewMultiLabelMapWithRegistry[metricHealthMessageLabel](
reg,
"tailscaled_health_messages",
"gauge",
"Number of health messages broken down by type.",
)
m.Set(metricHealthMessageLabel{
Type: MetricLabelWarning,
}, expvar.Func(func() any {
if t.nil() {
return 0
}
t.mu.Lock()
defer t.mu.Unlock()
t.updateBuiltinWarnablesLocked()
return int64(len(t.stringsLocked()))
}))
t.metricHealthMessage = m
}
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