Follows-up T263872: Localisation cache must be purged after or during train deploy, not (just) before.
The WMF-specific extensions/WikimediaMaintenance/refreshMessageBlobs.php is now identical to core's purgeMessageBlobStore.php. There is no longer a use for the WMF-specific one to my knowledge.
According to Codesearch we have:
- Outdated mention in scap.git: scap/main.py
- Else branch in scap.git: clear_message_blobs. Flatten to unconditional call? Yes.
- Shell invocation in puppet.git: scap/l10nupdate-1. I believe this has been unused for a long time, probably the script can be removed entirely (ref T158360: RFC: Reevaluate LocalisationUpdate extension for WMF).
- The script itself in WikimediaMaintenance.git: refreshMessageBlobs.php
- Special handling in wmf-config.git: multiversion/MWScript.php. This should be done last, after the actual script is deleted.