Add missing method comment

process/process.go

@@ -313,6 +313,9 @@ func loadProcess(ctx context.Context, key string, pInfo *processInfo.Process) (*
 	return process, nil
 }
 
+// GetID returns the key that is used internally to identify the process.
+// The ID consists of the PID and the start time of the process as reported by
+// the system.
 func (p *Process) GetID() string {
 	return p.processKey
 }