I'd have to go with Option B. Counting the components in pgstartreplication and comparing to the total Followers sounds like a good way to validate the setup.
Option D is a bit convoluted. Retrieving credentials from a test app and comparing them seems like an unnecessary extra step when simpler options are available.
I'm leaning towards Option C. Validating the Follower container ID against the Leader's info endpoint would provide a good cross-check on the Follower's identity.
Option A seems the most straightforward way to confirm the Follower's copy of the database. Comparing the log location between the Leader and Follower is a reliable method.
Option A seems the most straightforward way to confirm the Follower's copy of the database. Comparing the log location between the Leader and Follower is a reliable method.
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