fix: Temporary disable self trace apm config (#13790)

(cherry picked from commit a519c37)

changelogs/8.15.asciidoc

@@ -33,6 +33,6 @@ https://github.com/elastic/apm-server/compare/v8.14.3\...v8.15.0[View commits]
 - Upgraded bundled APM Java agent attacher CLI to version 1.50.0 {pull}13326[13326]
 - Enable Kibana curated UIs to work with hostmetrics from OpenTelemetry's https://pkg.go.dev/go.opentelemetry.io/collector/receiver/hostmetricsreceiver[hostmetricsreceiver] {pull}13196[13196]
 - Add require data stream to bulk index requests {pull}13398[13398]
-- Support self-instrumentation when in managed mode by getting tracing configs via reloader {pull}13514[13514] {pull}13653[13653] {pull}13691[13691]
+- Support self-instrumentation when in managed mode by getting tracing configs via reloader {pull}13514[13514] {pull}13653[13653] {pull}13691[13691] {pull}13790[13790]
 - Add mapping for OpenTelemetry attribute `messaging.destination.name` to derive `service.target` correctly {pull}13472[13472]
 - APM Server now automatically retries document-level 429s from Elasticsearch to avoid dropping data. `output.elasticsearch.max_retries` now controls both request-level and document-level retries, and defaults to `3`. {pull}13620[13620]

internal/beatcmd/beat_test.go

@@ -183,7 +183,7 @@ func TestRunManager(t *testing.T) {
 			},
 		},
 		"instrumentation": map[string]interface{}{
-			"enabled":     true,
+			"enabled":     false,
 			"environment": "testenv",
 		},
 	}, m)

internal/beatcmd/reloader.go

@@ -194,8 +194,9 @@ func (r *Reloader) reload(inputConfig, outputConfig, apmTracingConfig *config.C)
 		if err != nil {
 			return fmt.Errorf("APM tracing config for elastic not found")
 		}
-		// set enabled manually as APMConfig doesn't contain it
-		c.SetBool("enabled", -1, true)
+		// set enabled manually as APMConfig doesn't contain it.
+		// TODO set "enable" to true after the issue https://github.com/elastic/elastic-agent/issues/5211 gets resolved.
+		c.SetBool("enabled", -1, false)
 		wrappedApmTracingConfig = config.MustNewConfigFrom(map[string]interface{}{
 			"instrumentation": c,
 		})

internal/beatcmd/reloader_test.go

@@ -186,7 +186,7 @@ func TestReloaderNewRunnerParams(t *testing.T) {
 	args := <-calls
 	assert.NotNil(t, args.Logger)
 	assert.Equal(t, info, args.Info)
-	assert.Equal(t, config.MustNewConfigFrom(`{"revision": 1, "input": 123, "output.console.enabled": true, "instrumentation.enabled":true, "instrumentation.environment":"test"}`), args.Config)
+	assert.Equal(t, config.MustNewConfigFrom(`{"revision": 1, "input": 123, "output.console.enabled": true, "instrumentation.enabled":false, "instrumentation.environment":"test"}`), args.Config)
 }
 
 func expectNoEvent(t testing.TB, ch <-chan struct{}, message string) {