Mastodon Post Creation Failed: Error 503 MastodonServiceUnavailableError

[sentry-io]

Sentry Issue: BIGCASES2-42

MastodonServiceUnavailableError: ('Mastodon API returned error', 503, 'Service Unavailable', None)
(6 additional frame(s) were not displayed)
...
  File "bc/subscription/tasks.py", line 423, in make_post_for_webhook_event
    api_post_id = api.add_status(message, image, files)
  File "bc/channel/utils/connectors/masto.py", line 110, in add_status
    api_response = self.api.status_post(message, media_ids=media_ids)

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Filed by @ERosendo