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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
2026-05-26 16:02:01 -07:00
committed by Jordan Whited
parent 2eb45c2457
commit e5a8cf3b18
10 changed files with 317 additions and 1 deletions
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tailcfg/tailcfg.go
+6 -1
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@@ -185,7 +185,8 @@ type CapabilityVersion int
// - 136: 2026-04-09: Client understands [NodeAttrDisableLinuxCGNATDropRule]
// - 137: 2026-04-15: Client handles 429 responses to /machine/register.
// - 138: 2026-03-31: can handle C2N /debug/tka.
const CurrentCapabilityVersion CapabilityVersion = 138
// - 139: 2026-05-22: Client understands [NodeAttrEmitRuntimeMetrics]
const CurrentCapabilityVersion CapabilityVersion = 139
// ID is an integer ID for a user, node, or login allocated by the
// control plane.
@@ -2788,6 +2789,10 @@ const (
// that does not originate from the Tailscale network interface.
// This enables access to off-tailnet endpoints within that IP range.
NodeAttrDisableLinuxCGNATDropRule NodeCapability = "disable-linux-cgnat-drop-rule"
// NodeAttrEmitRuntimeMetrics enables emission of [runtime/metrics] as
// [tailscale.com/util/clientmetric]'s.
NodeAttrEmitRuntimeMetrics NodeCapability = "emit-runtime-metrics"
)
const (