$settings['deployment_identifier'] is hardly known nor documented.
Despite the fact that moving classes may bring you in a situation where you beter know about this:
# settings.php
$settings['deployment_identifier'] = 'something different';
I couldn not even simply find the place where it was invented.
Document this by adding a deployment example script that includes creating this.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
The deployment_identifier was adding in #2507509: Service changes should not result in fatal errors between patch or minor releases → , it started in this comment, #2507509-16: Service changes should not result in fatal errors between patch or minor releases →
Does anyone have suggested wording to add?