temp: Enable Celery distributed tracing in stage edxapp (#153)

Datadog Support suggested that we try enabling this to see if it changes
anything about the orphaned spans on the edxapp workers (unexpected
top-level spans that are not `operation_name:celery.run`, but instead are
other spans that have lost their parent association).

Just going to enable this on stage so we don't mess with traces in prod,
for now.

See edx/edx-arch-experiments#822

Author: timmc-edx

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

@@ -21,6 +21,14 @@ export DD_TRACE_LOG_STREAM_HANDLER=false
 # Suppress middleware spans because there are about 100 for each request.
 # Remove (or set to true) for debugging.
 export DD_DJANGO_INSTRUMENT_MIDDLEWARE=false
+
+{% if COMMON_ENVIRONMENT == "stage" %}
+# Temporary 2025-01-09: Enable Celery distributed tracing to see if it
+# has an effect on the remaining orphaned spans.
+# https://github.com/edx/edx-arch-experiments/issues/822
+export DD_CELERY_DISTRIBUTED_TRACING=true
+{% endif %}
+
 {% endif -%}
 
 # We want to be able to toggle this on separately from DD in general.
@@ -54,4 +62,4 @@ source {{ edxapp_app_dir }}/edxapp_env
 exec {{ executable }} -c {{ edxapp_app_dir }}/cms_gunicorn.py {{ EDXAPP_CMS_GUNICORN_EXTRA }} cms.wsgi --log-file {{ edxapp_gunicorn_log_dir[1] }}/edx.log
 {% else %}
 exec {{ executable }} -c {{ edxapp_app_dir }}/cms_gunicorn.py {{ EDXAPP_CMS_GUNICORN_EXTRA }} cms.wsgi
-{% endif %}
+{% endif %}

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

@@ -22,6 +22,13 @@ export DD_TRACE_LOG_STREAM_HANDLER=false
 # Remove (or set to true) for debugging.
 export DD_DJANGO_INSTRUMENT_MIDDLEWARE=false
 
+{% if COMMON_ENVIRONMENT == "stage" %}
+# Temporary 2025-01-09: Enable Celery distributed tracing to see if it
+# has an effect on the remaining orphaned spans.
+# https://github.com/edx/edx-arch-experiments/issues/822
+export DD_CELERY_DISTRIBUTED_TRACING=true
+{% endif %}
+
 {% endif -%}
 
 # We want to be able to toggle this on separately from DD in general.

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

@@ -21,6 +21,14 @@ export DD_TRACE_LOG_STREAM_HANDLER=false
 # Suppress middleware spans because there are about 100 for each request.
 # Remove (or set to true) for debugging.
 export DD_DJANGO_INSTRUMENT_MIDDLEWARE=false
+
+{% if COMMON_ENVIRONMENT == "stage" %}
+# Temporary 2025-01-09: Enable Celery distributed tracing to see if it
+# has an effect on the remaining orphaned spans.
+# https://github.com/edx/edx-arch-experiments/issues/822
+export DD_CELERY_DISTRIBUTED_TRACING=true
+{% endif %}
+
 {% endif -%}
 
 # We want to be able to toggle this on separately from DD in general.