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` that uses an asynchronous gauge function (#5293, #5294) 
+
+### Deprecated
+
+- The `runtime.uptime` metric in `instrumentation/runtime/runtime.go` is deprecated(#5293, #5294)
 
 ### Removed
 

instrumentation/runtime/runtime.go

@@ -108,6 +108,7 @@
 
 func (r *runtime) register() error {
 	startTime := time.Now()
+	// DEPRECATED: This metric is deprecated in favor of processUptime
 	uptime, err := r.meter.Int64ObservableCounter(
 		"runtime.uptime",
 		metric.WithUnit("ms"),
@@ -117,6 +118,15 @@
 		return err
 	}
 
+	processUptime, err := r.meter.Int64ObservableGauge(
+		"process.runtime.uptime",
+		metric.WithUnit("ms"),
+		metric.WithDescription("Milliseconds since application was initialized"),
+	)
+	if err != nil {
+		return err
+	}
+
 	goroutines, err := r.meter.Int64ObservableUpDownCounter(
 		"process.runtime.go.goroutines",
 		metric.WithDescription("Number of goroutines that currently exist"),
@@ -136,10 +146,12 @@
 	_, 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,