[receiver/jmx] Fix memory leak on shutdown (open-telemetry#32289)

**Description:** <Describe what has changed.>
<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
The receiver was starting a goroutine that would run without being
stopped during shutdown. This changes the goroutine to be stopped during
shutdown.

`goleak` is also added as a part of this change.

**Link to tracking Issue:** <Issue number if applicable>
open-telemetry#30438

**Testing:** <Describe what testing was performed and which tests were
added.>
All existing tests are passing, as well as added `goleak` check.

Author: crobert-1

.chloggen/goleak_jmxrec.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: bug_fix
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: jmxreceiver
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Fix memory leak during component shutdown
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [32289]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

receiver/jmxreceiver/go.mod

@@ -19,6 +19,7 @@ require (
 	go.opentelemetry.io/collector/receiver/otlpreceiver v0.97.1-0.20240409140257-792fac1b62d4
 	go.opentelemetry.io/otel/metric v1.24.0
 	go.opentelemetry.io/otel/trace v1.24.0
+	go.uber.org/goleak v1.3.0
 	go.uber.org/zap v1.27.0
 )
 

receiver/jmxreceiver/package_test.go

@@ -0,0 +1,14 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package jmxreceiver
+
+import (
+	"testing"
+
+	"go.uber.org/goleak"
+)
+
+func TestMain(m *testing.M) {
+	goleak.VerifyTestMain(m)
+}

receiver/jmxreceiver/receiver.go

@@ -36,6 +36,7 @@ type jmxMetricReceiver struct {
 	otlpReceiver receiver.Metrics
 	nextConsumer consumer.Metrics
 	configFile   string
+	cancel       context.CancelFunc
 }
 
 func newJMXMetricReceiver(
@@ -54,6 +55,8 @@ func newJMXMetricReceiver(
 func (jmx *jmxMetricReceiver) Start(ctx context.Context, host component.Host) error {
 	jmx.logger.Debug("starting JMX Receiver")
 
+	ctx, jmx.cancel = context.WithCancel(ctx)
+
 	var err error
 	jmx.otlpReceiver, err = jmx.buildOTLPReceiver()
 	if err != nil {
@@ -98,13 +101,19 @@ func (jmx *jmxMetricReceiver) Start(ctx context.Context, host component.Host) er
 		return err
 	}
 	go func() {
-		for range jmx.subprocess.Stdout { // nolint
-			// ensure stdout/stderr buffer is read from.
-			// these messages are already debug logged when captured.
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			case <-jmx.subprocess.Stdout:
+				// ensure stdout/stderr buffer is read from.
+				// these messages are already debug logged when captured.
+				continue
+			}
 		}
 	}()
 
-	return jmx.subprocess.Start(context.Background())
+	return jmx.subprocess.Start(ctx)
 }
 
 func (jmx *jmxMetricReceiver) Shutdown(ctx context.Context) error {
@@ -114,6 +123,11 @@ func (jmx *jmxMetricReceiver) Shutdown(ctx context.Context) error {
 	jmx.logger.Debug("Shutting down JMX Receiver")
 	subprocessErr := jmx.subprocess.Shutdown(ctx)
 	otlpErr := jmx.otlpReceiver.Shutdown(ctx)
+
+	if jmx.cancel != nil {
+		jmx.cancel()
+	}
+
 	removeErr := os.Remove(jmx.configFile)
 	if subprocessErr != nil {
 		return subprocessErr