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control/controlknobs,feature/*,ipn/ipnlocal,tailcfg: add runtimemetrics

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Emit runtime metrics as clientmetrics when the
NodeAttrEmitRuntimeMetrics NodeCapability is present.

We start small with just 2 metrics: heap bytes and total process memory.

Updates tailscale/corp#39434

Signed-off-by: Jordan Whited <jordan@tailscale.com>
This commit is contained in:
Jordan Whited
2026-05-22 14:19:42 -07:00
committed by Jordan Whited
parent 2eb45c2457
commit e5a8cf3b18
10 changed files with 317 additions and 1 deletions
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6
control/controlknobs/controlknobs.go
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@@ -110,6 +110,10 @@ type Knobs struct {
// See https://github.com/tailscale/tailscale/issues/15404.
// TODO(bradfitz): remove this a few releases after 2026-02-16.
ForceRegisterMagicDNSIPv4Only atomic.Bool
// EmitRuntimeMetrics is whether the node should poll and emit [runtime/metrics]
// as [tailscale.com/util/clientmetric]'s.
EmitRuntimeMetrics atomic.Bool
}
// UpdateFromNodeAttributes updates k (if non-nil) based on the provided self
@@ -139,6 +143,7 @@ func (k *Knobs) UpdateFromNodeAttributes(capMap tailcfg.NodeCapMap) {
disableSkipStatusQueue = has(tailcfg.NodeAttrDisableSkipStatusQueue)
disableHostsFileUpdates = has(tailcfg.NodeAttrDisableHostsFileUpdates)
forceRegisterMagicDNSIPv4Only = has(tailcfg.NodeAttrForceRegisterMagicDNSIPv4Only)
emitRuntimeMetrics = has(tailcfg.NodeAttrEmitRuntimeMetrics)
)
if has(tailcfg.NodeAttrOneCGNATEnable) {
@@ -166,6 +171,7 @@ func (k *Knobs) UpdateFromNodeAttributes(capMap tailcfg.NodeCapMap) {
k.DisableSkipStatusQueue.Store(disableSkipStatusQueue)
k.DisableHostsFileUpdates.Store(disableHostsFileUpdates)
k.ForceRegisterMagicDNSIPv4Only.Store(forceRegisterMagicDNSIPv4Only)
k.EmitRuntimeMetrics.Store(emitRuntimeMetrics)
}
// AsDebugJSON returns k as something that can be marshalled with json.Marshal