Create a new metric process.runtime.uptime and deprecate runtime.uptime metric in instrumentation/runtime/runtime.go file

CHANGELOG.md

@@ -11,6 +11,11 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 ### Added
 
 - Add the new `go.opentelemetry.io/contrib/instrgen` package to provide auto-generated source code instrumentation. (#3068, #3108)
+- Add a new metric `process.runtime.uptime` to `go.opentelemetry.io/contrib/runtime` that uses an asynchronous gauge function. (#5317) 
+
+### Deprecated
+
+- The `runtime.uptime` metric in `go.opentelemetry.io/contrib/runtime` is deprecated. (#5317)
 
 ## [1.26.0/0.51.0/0.20.0/0.6.0/0.1.0] - 2024-04-24
 

instrumentation/runtime/runtime.go

@@ -111,6 +111,15 @@ func (r *runtime) register() error {
 	uptime, err := r.meter.Int64ObservableCounter(
 		"runtime.uptime",
 		metric.WithUnit("ms"),
+		metric.WithDescription("Milliseconds since application was initialized. Deprecated metric. Use `process.runtime.runtime` instead."),
+	)
+	if err != nil {
+		return err
+	}
+
+	processUptime, err := r.meter.Int64ObservableGauge(
+		"process.runtime.uptime",
+		metric.WithUnit("ms"),
 		metric.WithDescription("Milliseconds since application was initialized"),
 	)
 	if err != nil {
@@ -136,10 +145,12 @@ func (r *runtime) register() error {
 	_, err = r.meter.RegisterCallback(
 		func(ctx context.Context, o metric.Observer) error {
 			o.ObserveInt64(uptime, time.Since(startTime).Milliseconds())
+			o.ObserveInt64(processUptime, time.Since(startTime).Milliseconds())
 			o.ObserveInt64(goroutines, int64(goruntime.NumGoroutine()))
 			o.ObserveInt64(cgoCalls, goruntime.NumCgoCall())
 			return nil
 		},
+		processUptime,
 		uptime,
 		goroutines,
 		cgoCalls,