Enable the retirement propagation handler on pdc-backend02.

inventory/group_vars/pdc-backend

@@ -29,8 +29,10 @@ csi_relationship: |
  compose at a time.
 
  On pdc-updater02, the modularity handlers are enabled which listen for MBS
- activity, and store that in PDC.  Multiple threads are enabled so that it can
- work more efficiently on these smaller tasks.
+ activity, and store that in PDC.  pdc-updater02 also hosts the retirement
+ handler which listens to dist-git for new dead.package files, and propagates
+ the retirement to PDC (by prematurely EOLing the branch).  Multiple threads are
+ enabled so that it can work more efficiently on these smaller tasks.
 
  On pdc-updater03, the dep chain handlers are enabled which listen for koji
  messages and store dep chain information in PDC, like what rpms depend on what

roles/pdc/backend/templates/pdcupdater.py

@@ -70,6 +70,8 @@ config = {
         {% elif inventory_hostname.startswith('pdc-backend02') %}
         # For MBS https://fedoraproject.org/wiki/Changes/ModuleBuildService
         'pdcupdater.handlers.modules:ModuleStateChangeHandler',
+        # For https://fedoraproject.org/wiki/Changes/ArbitraryBranching
+        'pdcupdater.handlers.retirement:RetireComponentHandler',
         {% elif inventory_hostname.startswith('pdc-backend03') %}
         ## https://fedoraproject.org/wiki/User:Ralph/Drafts/Infrastructure/Factory2/ModellingDeps
         #'pdcupdater.handlers.depchain.rpms:NewRPMBuildTimeDepChainHandler',