optimize memory allocs

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

go.mod

@@ -1,18 +1,16 @@
 module go.unistack.org/micro-meter-victoriametrics/v4
 
-go 1.24.0
+go 1.25
-
-toolchain go1.24.4
 
 require (
 	github.com/VictoriaMetrics/metrics v1.40.2
-	go.unistack.org/micro/v4 v4.1.23
+	go.unistack.org/micro/v4 v4.1.25
 )
 
 require (
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/matoous/go-nanoid v1.5.1 // indirect
-	github.com/spf13/cast v1.8.0 // indirect
+	github.com/spf13/cast v1.10.0 // indirect
 	github.com/valyala/fastrand v1.1.0 // indirect
 	github.com/valyala/histogram v1.2.0 // indirect
 	go.unistack.org/micro-proto/v4 v4.1.0 // indirect

go.sum

@@ -1,7 +1,7 @@
 github.com/VictoriaMetrics/metrics v1.40.2 h1:OVSjKcQEx6JAwGeu8/KQm9Su5qJ72TMEW4xYn5vw3Ac=
 github.com/VictoriaMetrics/metrics v1.40.2/go.mod h1:XE4uudAAIRaJE614Tl5HMrtoEU6+GDZO4QTnNSsZRuA=
-github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
-github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHkI4W8=
 github.com/frankban/quicktest v1.14.6/go.mod h1:4ptaffx2x8+WTWXmUCuVU6aPUX1/Mz7zb5vbUoiM6w0=
 github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
@@ -16,22 +16,22 @@ github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/matoous/go-nanoid v1.5.1 h1:aCjdvTyO9LLnTIi0fgdXhOPPvOHjpXN6Ik9DaNjIct4=
 github.com/matoous/go-nanoid v1.5.1/go.mod h1:zyD2a71IubI24efhpvkJz+ZwfwagzgSO6UNiFsZKN7U=
-github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRIccs7FGNTlIRMkT8wgtp5eCXdBlqhYGL6U=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/rogpeppe/go-internal v1.13.1 h1:KvO1DLK/DRN07sQ1LQKScxyZJuNnedQ5/wKSR38lUII=
+github.com/rogpeppe/go-internal v1.14.1 h1:UQB4HGPB6osV0SQTLymcB4TgvyWu6ZyliaW0tI/otEQ=
-github.com/rogpeppe/go-internal v1.13.1/go.mod h1:uMEvuHeurkdAXX61udpOXGD/AzZDWNMNyH2VO9fmH0o=
+github.com/rogpeppe/go-internal v1.14.1/go.mod h1:MaRKkUm5W0goXpeCfT7UZI6fk/L7L7so1lCWt35ZSgc=
-github.com/spf13/cast v1.8.0 h1:gEN9K4b8Xws4EX0+a0reLmhq8moKn7ntRlQYgjPeCDk=
+github.com/spf13/cast v1.10.0 h1:h2x0u2shc1QuLHfxi+cTJvs30+ZAHOGRic8uyGTDWxY=
-github.com/spf13/cast v1.8.0/go.mod h1:ancEpBxwJDODSW/UG4rDrAqiKolqNNh2DX3mk86cAdo=
+github.com/spf13/cast v1.10.0/go.mod h1:jNfB8QC9IA6ZuY2ZjDp0KtFO2LZZlg4S/7bzP6qqeHo=
-github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
+github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
-github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
 github.com/valyala/fastrand v1.1.0 h1:f+5HkLW4rsgzdNoleUOB69hyT9IlD2ZQh9GyDMfb5G8=
 github.com/valyala/fastrand v1.1.0/go.mod h1:HWqCzkrkg6QXT8V2EXWvXCoow7vLwOFN002oeRzjapQ=
 github.com/valyala/histogram v1.2.0 h1:wyYGAZZt3CpwUiIb9AU/Zbllg1llXyrtApRS815OLoQ=
 github.com/valyala/histogram v1.2.0/go.mod h1:Hb4kBwb4UxsaNbbbh+RRz8ZR6pdodR57tzWUS3BUzXY=
 go.unistack.org/micro-proto/v4 v4.1.0 h1:qPwL2n/oqh9RE3RTTDgt28XK3QzV597VugQPaw9lKUk=
 go.unistack.org/micro-proto/v4 v4.1.0/go.mod h1:ArmK7o+uFvxSY3dbJhKBBX4Pm1rhWdLEFf3LxBrMtec=
-go.unistack.org/micro/v4 v4.1.23 h1:T9O1O1mN60JHqIAIw+XkNik8xb0h90O9fJ55uQMb8VU=
+go.unistack.org/micro/v4 v4.1.25 h1:JznyZN4K4HrfaEJNPC8z86EBMqC57NiQnmTrNR/Lu6M=
-go.unistack.org/micro/v4 v4.1.23/go.mod h1:nlBXTbx0rQrSZX4HPp2m57PHmpuGPWUd0O+jpUIiPto=
+go.unistack.org/micro/v4 v4.1.25/go.mod h1:PK9s7QW65HrWf26FWkdmPEQoYhsdV0e1WwThwspjpls=
 golang.org/x/net v0.48.0 h1:zyQRTTrjc33Lhh0fBgT/H3oZq9WuvRR5gPC70xpDiQU=
 golang.org/x/net v0.48.0/go.mod h1:+ndRgGjkh8FGtu1w1FGbEC31if4VrNVMuKTgcAAnQRY=
 golang.org/x/sys v0.39.0 h1:CvCKL8MeisomCi6qNZ+wbb0DN9E5AATixKsvNtMoMFk=

victoriametrics.go

@@ -6,16 +6,22 @@ import (
 
 	"github.com/VictoriaMetrics/metrics"
 	"go.unistack.org/micro/v4/meter"
+	xpool "go.unistack.org/micro/v4/util/xpool"
 )
 
 type victoriametricsMeter struct {
 	set              *metrics.Set
 	opts             meter.Options
 	prometheusCompat bool
+	builderPool      *xpool.StringsPool
 }
 
 func NewMeter(opts ...meter.Option) meter.Meter {
-	m := &victoriametricsMeter{set: metrics.NewSet(), opts: meter.NewOptions(opts...)}
+	m := &victoriametricsMeter{
+		set:         metrics.NewSet(),
+		opts:        meter.NewOptions(opts...),
+		builderPool: xpool.NewStringsPool(256),
+	}
 	if v, ok := m.opts.Context.Value(prometheusCompatKey{}).(bool); ok && v {
 		m.prometheusCompat = v
 	}
@@ -48,11 +54,34 @@ func (r *victoriametricsMeter) buildName(name string, labels ...string) string {
 		return name
 	}
 
-	nlabels := make([]string, 0, nl)
+	b := r.builderPool.Get()
-	nlabels = append(nlabels, r.opts.Labels...)
+	defer r.builderPool.Put(b)
-	nlabels = append(nlabels, labels...)
 
-	return meter.BuildName(name, nlabels...)
+	b.WriteString(name)
+	b.WriteByte('{')
+
+	for i := 0; i < len(r.opts.Labels); i += 2 {
+		if i > 0 {
+			b.WriteByte(',')
+		}
+		b.WriteString(r.opts.Labels[i])
+		b.WriteString(`="`)
+		b.WriteString(r.opts.Labels[i+1])
+		b.WriteByte('"')
+	}
+
+	for i := 0; i < len(labels); i += 2 {
+		if i > 0 || len(r.opts.Labels) > 0 {
+			b.WriteByte(',')
+		}
+		b.WriteString(labels[i])
+		b.WriteString(`="`)
+		b.WriteString(labels[i+1])
+		b.WriteByte('"')
+	}
+
+	b.WriteByte('}')
+	return b.String()
 }
 
 func (r *victoriametricsMeter) Counter(name string, labels ...string) meter.Counter {