feat: anonymous usage telemetry via oss-telemetry

Send a single fire-and-forget ping at startup to help track adoption
and version spread. No persistent identifiers are collected.

Adds main.appVersion var (defaulting to "dev"); wire ldflags
(-X main.appVersion=$VERSION) to populate it at release time.

Opt out via any of:
  DO_NOT_TRACK=1
  OSS_TELEMETRY_DISABLED=1
  GRAPHQL_MONITORING_PROXY_DISABLE_TELEMETRY=1

go.mod

@@ -18,6 +18,7 @@ require (
 	github.com/lukaszraczylo/ask v0.0.0-20240916204100-6e9ef53a62d9
 	github.com/lukaszraczylo/go-ratecounter v0.1.12
 	github.com/lukaszraczylo/go-simple-graphql v1.2.89
+	github.com/lukaszraczylo/oss-telemetry v0.0.0-20260521005811-e02d51419c52
 	github.com/redis/go-redis/v9 v9.18.0
 	github.com/sony/gobreaker v1.0.0
 	github.com/stretchr/testify v1.11.1

go.sum

@@ -76,6 +76,8 @@ github.com/lukaszraczylo/go-ratecounter v0.1.12 h1:VO6hHYGw/Jy9JUizXf/bS0AI2QX1u
 github.com/lukaszraczylo/go-ratecounter v0.1.12/go.mod h1:TqXEOCtFJStk1i0tkipprv1kiDHGon1MVUisjSTBSKM=
 github.com/lukaszraczylo/go-simple-graphql v1.2.89 h1:Xbu1Ny+a0lT2Sr2SaSC8mcHmGQDwGD4TJKk4DDd+PwA=
 github.com/lukaszraczylo/go-simple-graphql v1.2.89/go.mod h1:PxQYblQDZISmYYj8sNfazAWxAOh1rhAtU208y+uPV8s=
+github.com/lukaszraczylo/oss-telemetry v0.0.0-20260521005811-e02d51419c52 h1:HAm1OV/1uYN3VA/HdDNFjwh8KerTLwl1SoxF+IiNf/M=
+github.com/lukaszraczylo/oss-telemetry v0.0.0-20260521005811-e02d51419c52/go.mod h1:+Cn78qZo8rc3T9eZt0v3oICYRdd75wORtSidc8lNjDQ=
 github.com/mattn/go-colorable v0.1.14 h1:9A9LHSqF/7dyVVX6g0U9cwm9pG3kP9gSzcuIPHPsaIE=
 github.com/mattn/go-colorable v0.1.14/go.mod h1:6LmQG8QLFO4G5z1gPvYEzlUgJ2wF+stgPZH1UqBm1s8=
 github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=

main.go

@@ -28,11 +28,17 @@ import (
 	libpack_logging "github.com/lukaszraczylo/graphql-monitoring-proxy/logging"
 	libpack_monitoring "github.com/lukaszraczylo/graphql-monitoring-proxy/monitoring"
 	libpack_tracing "github.com/lukaszraczylo/graphql-monitoring-proxy/tracing"
+	telemetry "github.com/lukaszraczylo/oss-telemetry"
 
 	// Auto-tune GOMAXPROCS from cgroup CPU quota (containerized workloads).
 	_ "go.uber.org/automaxprocs"
 )
 
+// appVersion is the build version. Set via ldflags during build:
+//
+//	-X main.appVersion=v1.2.3
+var appVersion = "dev"
+
 var (
 	cfg             *config
 	cfgMutex        sync.RWMutex
@@ -512,6 +518,8 @@ func parseConfig() {
 }
 
 func main() {
+	telemetry.Send("graphql-monitoring-proxy", appVersion)
+
 	// Parse configuration
 	parseConfig()