Remove unnecessary code from render_config (#45929)

### What does this PR do?

- Migrate APM example to a static file: APM example doesn't contain any setting nor use any templating. There is no reason to use render_config for this.
- Remove unused template: APM Injection was removed with #44358 but the template was never updated

### Describe how you validated your changes

For the APM team: check that `application_monitoring.yaml.example` is still correctly shipped for linux.

Co-authored-by: maxime.mouial <maxime.mouial@datadoghq.com>

Author: hush-hush

.github/CODEOWNERS

@@ -509,6 +509,7 @@
 /pkg/config/                            @DataDog/agent-configuration
 /pkg/config/config_template.yaml        @DataDog/agent-configuration @DataDog/documentation
 /pkg/config/setup/apm.go                @DataDog/agent-apm @DataDog/agent-configuration
+/pkg/config/example/application_monitoring.yaml.example @DataDog/agent-apm
 /pkg/config/autodiscovery/              @DataDog/container-integrations @DataDog/container-platform @DataDog/agent-configuration
 /pkg/config/env                         @DataDog/container-integrations @DataDog/container-platform @DataDog/agent-configuration
 /pkg/config/setup                            @DataDog/agent-configuration

omnibus/config/software/datadog-agent.rb

@@ -283,8 +283,7 @@
 
   # APM Hands Off config file
   if linux_target?
-    command "dda inv -- agent.generate-config --build-type application-monitoring --output-file ./bin/agent/dist/application_monitoring.yaml", :env => env
-    move 'bin/agent/dist/application_monitoring.yaml', "#{conf_dir}/application_monitoring.yaml.example"
+    copy 'pkg/config/example/application_monitoring.yaml.example', "#{conf_dir}/application_monitoring.yaml.example"
   end
 
   # Allows the agent to be installed in a custom location

pkg/config/config_template.yaml

@@ -4953,142 +4953,3 @@ api_key:
 #
 #     verbosity: normal
 {{ end -}}
-{{- if .APMInjection -}}
-##############################################
-## Datadog APM Auto-injection Configuration ##
-##############################################
-
-## @param injection_controller_config - custom object
-## This section configures the Datadog APM Auto Injection controller.
-## Uncomment this parameter and the one below to enable them.
-#
-# injection_controller_config:
-
-#   # @param enabled - boolean - optional - default: false
-#   # Set to true to enable the APM Auto-injection.
-#   # Please note that enabling this service will result in a kernel driver being loaded.
-#
-#   enabled: false
-
-#   # @param log_file - string - optional - default: c:\programdata\datadog\logs\apm-inject.log
-#   # The full path to the file where injection controller logs are written.
-#
-#   log_file: c:\programdata\datadog\logs\apm-inject.log
-
-#   # @param log_level - string - optional - default: info
-#   # Minimum log level of the injection controller.
-#   # Valid log levels are: debug, info, warn, and error.
-#
-#   log_level: 'info'
-
-#   # @param log_to_console - boolean - optional - default: true
-#   # Set to 'false' to disable injection controller logging to stdout.
-#
-#   log_to_console: true
-
-#   # @param socket_port - integer - optional - default: 3030
-#   # The port used for the injection controller communications API (served on localhost).
-#
-#   socket_port: 3030
-
-#   internal_profiling:
-#
-#     # @param enabled - boolean - optional - default: false
-#     # Enable internal profiling for the injection controller process.
-#
-#     enabled: false
-
-## @param service_configs - list of custom objects
-## This section configures the services which will be automatically injected with APM
-## configurations, as well as the APM configurations which will be injected.
-#
-# service_configs:
-
-#   # @param service configuration - custom object
-#   # In order to configure APM auto-injection for a service or set of services, an injection condition
-#   # and APM configuration must be provided.
-#   #
-#   # Example:
-#   # - conditions:
-#   #     command_line_regex: executable_name.exe
-#   #   configuration:
-#   #     service_language: dotnet
-#   #     dd_env: staging
-#   #     dd_service: exampleService
-#   #     dd_version: 1.2.3
-#   #
-#   # To learn about all the available service matching conditions & configuration options, visit
-#   # https://docs.datadoghq.com/tracing/trace_collection/library_injection_local
-{{ end -}}
-{{- if .ApplicationMonitoring -}}
-###############################
-## Datadog APM Configuration ##
-###############################
-
-## @section APM Configuration Rules
-##
-## Enable and configure APM, profiling, and security monitoring features.
-##
-## Settings can be configured via environment variables or the application_monitoring.yaml file.
-## Configuration precedence (highest to lowest priority):
-##   1. Fleet-managed config file
-##      (etc/datadog-agent/managed/datadog-agent/stable/application_monitoring.yaml)
-##   2. Environment variables
-##   3. Local config file
-##      (etc/datadog-agent/application_monitoring.yaml)
-# apm_configuration_default:
-
-#   # @param DD_APM_TRACING_ENABLED - boolean - optional - default: true
-#   # Enable Datadog tracing.
-#   # Docs: https://docs.datadoghq.com/tracing/trace_collection/
-#   DD_APM_TRACING_ENABLED: true
-
-#   # @param DD_RUNTIME_METRICS_ENABLED - boolean - optional - default: false
-#   # Enable runtime metrics.
-#   # Docs: https://docs.datadoghq.com/tracing/metrics/runtime_metrics/?tab=java#environment-variables
-#   DD_RUNTIME_METRICS_ENABLED: false
-
-#   # @param DD_LOGS_INJECTION - boolean - optional - default: false
-#   # Enable automatic trace and span ID injection into logs.
-#   # Docs: https://docs.datadoghq.com/tracing/other_telemetry/connect_logs_and_traces/
-#   DD_LOGS_INJECTION: false
-
-#   # @param DD_PROFILING_ENABLED - boolean - optional - default: false
-#   # Enable continuous profiling.
-#   # Docs: https://docs.datadoghq.com/profiler/
-#   DD_PROFILING_ENABLED: false
-
-#   # @param DD_DATA_STREAMS_ENABLED - boolean - optional - default: false
-#   # Enable data streams monitoring.
-#   # Docs: https://docs.datadoghq.com/data_streams/
-#   DD_DATA_STREAMS_ENABLED: false
-
-#   # @param DD_APPSEC_ENABLED - boolean - optional - default: false
-#   # Enable the Application Security product.
-#   # Docs: https://docs.datadoghq.com/security/application_security/
-#   DD_APPSEC_ENABLED: false
-
-#   # @param DD_IAST_ENABLED - boolean - optional - default: false
-#   # Enable Interactive Application Security Testing (IAST).
-#   # Docs: https://docs.datadoghq.com/security/code_security/iast/setup/#amazon-ecs
-#   DD_IAST_ENABLED: false
-
-#   # @param DD_DYNAMIC_INSTRUMENTATION_ENABLED - boolean - optional - default: false
-#   # Enable Dynamic Instrumentation.
-#   # Docs: https://docs.datadoghq.com/dynamic_instrumentation/
-#   DD_DYNAMIC_INSTRUMENTATION_ENABLED: false
-
-#   # @param DD_DATA_JOBS_ENABLED - boolean - optional - default: false
-#   # Enable data jobs visibility.
-#   DD_DATA_JOBS_ENABLED: false
-
-#   # @param DD_APPSEC_SCA_ENABLED - boolean - optional - default: false
-#   # Enable Software Composition Analysis.
-#   # Docs: https://docs.datadoghq.com/security/code_security/software_composition_analysis/
-#   DD_APPSEC_SCA_ENABLED: false
-
-#   # @param DD_TRACE_DEBUG - boolean - optional - default: false
-#   # Enable debug logging for the tracer.
-#   # Docs: https://docs.datadoghq.com/tracing/troubleshooting/tracer_debug_logs
-#   DD_TRACE_DEBUG: false
-{{ end -}}

pkg/config/example/application_monitoring.yaml.example

@@ -0,0 +1,70 @@
+###############################
+## Datadog APM Configuration ##
+###############################
+
+## @section APM Configuration Rules
+##
+## Enable and configure APM, profiling, and security monitoring features.
+##
+## Settings can be configured via environment variables or the application_monitoring.yaml file.
+## Configuration precedence (highest to lowest priority):
+##   1. Fleet-managed config file
+##      (etc/datadog-agent/managed/datadog-agent/stable/application_monitoring.yaml)
+##   2. Environment variables
+##   3. Local config file
+##      (etc/datadog-agent/application_monitoring.yaml)
+# apm_configuration_default:
+
+#   # @param DD_APM_TRACING_ENABLED - boolean - optional - default: true
+#   # Enable Datadog tracing.
+#   # Docs: https://docs.datadoghq.com/tracing/trace_collection/
+#   DD_APM_TRACING_ENABLED: true
+
+#   # @param DD_RUNTIME_METRICS_ENABLED - boolean - optional - default: false
+#   # Enable runtime metrics.
+#   # Docs: https://docs.datadoghq.com/tracing/metrics/runtime_metrics/?tab=java#environment-variables
+#   DD_RUNTIME_METRICS_ENABLED: false
+
+#   # @param DD_LOGS_INJECTION - boolean - optional - default: false
+#   # Enable automatic trace and span ID injection into logs.
+#   # Docs: https://docs.datadoghq.com/tracing/other_telemetry/connect_logs_and_traces/
+#   DD_LOGS_INJECTION: false
+
+#   # @param DD_PROFILING_ENABLED - boolean - optional - default: false
+#   # Enable continuous profiling.
+#   # Docs: https://docs.datadoghq.com/profiler/
+#   DD_PROFILING_ENABLED: false
+
+#   # @param DD_DATA_STREAMS_ENABLED - boolean - optional - default: false
+#   # Enable data streams monitoring.
+#   # Docs: https://docs.datadoghq.com/data_streams/
+#   DD_DATA_STREAMS_ENABLED: false
+
+#   # @param DD_APPSEC_ENABLED - boolean - optional - default: false
+#   # Enable the Application Security product.
+#   # Docs: https://docs.datadoghq.com/security/application_security/
+#   DD_APPSEC_ENABLED: false
+
+#   # @param DD_IAST_ENABLED - boolean - optional - default: false
+#   # Enable Interactive Application Security Testing (IAST).
+#   # Docs: https://docs.datadoghq.com/security/code_security/iast/setup/#amazon-ecs
+#   DD_IAST_ENABLED: false
+
+#   # @param DD_DYNAMIC_INSTRUMENTATION_ENABLED - boolean - optional - default: false
+#   # Enable Dynamic Instrumentation.
+#   # Docs: https://docs.datadoghq.com/dynamic_instrumentation/
+#   DD_DYNAMIC_INSTRUMENTATION_ENABLED: false
+
+#   # @param DD_DATA_JOBS_ENABLED - boolean - optional - default: false
+#   # Enable data jobs visibility.
+#   DD_DATA_JOBS_ENABLED: false
+
+#   # @param DD_APPSEC_SCA_ENABLED - boolean - optional - default: false
+#   # Enable Software Composition Analysis.
+#   # Docs: https://docs.datadoghq.com/security/code_security/software_composition_analysis/
+#   DD_APPSEC_SCA_ENABLED: false
+
+#   # @param DD_TRACE_DEBUG - boolean - optional - default: false
+#   # Enable debug logging for the tracer.
+#   # Docs: https://docs.datadoghq.com/tracing/troubleshooting/tracer_debug_logs
+#   DD_TRACE_DEBUG: false

pkg/config/render_config.go

@@ -162,16 +162,6 @@ func mkContext(buildType string) context {
 			OS:            runtime.GOOS,
 			SecurityAgent: true,
 		}
-	case "apm-injection":
-		return context{
-			OS:           runtime.GOOS,
-			APMInjection: true,
-		}
-	case "application-monitoring":
-		return context{
-			OS:                    runtime.GOOS,
-			ApplicationMonitoring: true,
-		}
 	}
 
 	return context{}