Update

vendor/tailscale.com/util/clientmetric/omit.go

@@ -0,0 +1,31 @@
+// Copyright (c) Tailscale Inc & AUTHORS
+// SPDX-License-Identifier: BSD-3-Clause
+
+//go:build ts_omit_clientmetrics
+
+package clientmetric
+
+type Metric struct{}
+
+func (*Metric) Add(int64)              {}
+func (*Metric) Set(int64)              {}
+func (*Metric) Value() int64           { return 0 }
+func (*Metric) Register(expvarInt any) {}
+func (*Metric) UnregisterAll()         {}
+
+type MetricUpdate struct {
+	Name  string `json:"name"`
+	Type  string `json:"type"`
+	Value int    `json:"value"`
+	Op    string `json:"op"`
+}
+
+func HasPublished(string) bool            { panic("unreachable") }
+func EncodeLogTailMetricsDelta() string   { return "" }
+func WritePrometheusExpositionFormat(any) {}
+
+var zeroMetric Metric
+
+func NewCounter(string) *Metric          { return &zeroMetric }
+func NewGauge(string) *Metric            { return &zeroMetric }
+func NewAggregateCounter(string) *Metric { return &zeroMetric }