feat: add dd-trace to edxapp workers

playbooks/roles/edxapp/templates/edx/app/edxapp/worker.sh.j2

@@ -7,6 +7,18 @@ source {{ edxapp_app_dir }}/edxapp_env
 {% if COMMON_ENABLE_NEWRELIC_APP %}
 {% set executable = edxapp_venv_bin + '/newrelic-admin run-program ' + edxapp_venv_bin + '/celery' %}
 
+{% if COMMON_ENABLE_DATADOG and COMMON_ENABLE_DATADOG_APP %}
+{% set executable = edxapp_venv_bin + '/ddtrace-run ' + executable %}
+export DD_TAGS=$(dd_trace_service_name)
+export DD_DJANGO_USE_LEGACY_RESOURCE_FORMAT=true
+# Copied from edx_django_service playbook for consistency; Datadog
+# trace debug logging issue doesn't actually affect edxapp for some
+# reason.
+export DD_TRACE_LOG_STREAM_HANDLER=false
+# Datadog's instrumentation breaks pymongo: https://github.com/edx/edx-arch-experiments/issues/580
+export DD_TRACE_PYMONGO_ENABLED=false
+{% endif -%}
+
 export NEW_RELIC_CONFIG_FILE="{{ edxapp_app_dir }}/newrelic.ini"
 if command -v ec2metadata >/dev/null 2>&1; then
   INSTANCEID=$(ec2metadata --instance-id);

playbooks/roles/edxapp/templates/edx/app/supervisor/conf.d.available/workers.conf.j2

@@ -7,7 +7,7 @@ directory={{ edxapp_code_dir }}
 stdout_logfile={{ supervisor_log_dir }}/%(program_name)s-stdout.log
 stderr_logfile={{ supervisor_log_dir }}/%(program_name)s-stderr.log
 
-command={{ edxapp_app_dir }}/worker.sh --app={{ w.service_variant }}.celery:APP worker --loglevel=info --queues=edx.{{ w.service_variant }}.core.{{ w.queue }} --hostname=edx.{{ w.service_variant }}.core.{{ w.queue }}.%%h --concurrency={{ w.concurrency }} {{ '--max-tasks-per-child ' + w.max_tasks_per_child|string if w.max_tasks_per_child is defined else '' }} {{ '--without-heartbeat' if not EDXAPP_CELERY_HEARTBEAT_ENABLED|bool else '' }} {{ '-O ' + w.prefetch_optimization if w.prefetch_optimization is defined else '' }}
+command={{ edxapp_app_dir }}/worker.sh --app={{ w.service_variant }}.celery:APP worker --loglevel=info --queues=edx.{{ w.service_variant }}.core.{{ w.queue }} --hostname=edx.{{ w.service_variant }}.core.{{ w.queue }}.%%h --concurrency={{ w.concurrency }} {{ '--max-tasks-per-child ' + w.max_tasks_per_child|string if w.max_tasks_per_child is defined else '' }} {{ '--without-heartbeat' if not EDXAPP_CELERY_HEARTBEAT_ENABLED|bool else '' }} {{ '-O ' + w.prefetch_optimization if w.prefetch_optimization is defined else '' }} --dd_trace_service_name=service:edx-edxapp-{{ w.service_variant }}-workers-core-{{ w.queue }}
 killasgroup=true
 stopwaitsecs={{ w.stopwaitsecs | default(EDXAPP_WORKER_DEFAULT_STOPWAITSECS) }}