Replication: How to query current segments allocation relative to "Wal keep segments"?

[Edson Carlos Ericksson Richter <edsonrichter@xxxxxxxxxxx>]

I'm maintaining async replication (streaming) between four database 
servers arranged on 2 x 2.
How to  query current segments allocation relative to "Wal keep 
segments" in each master server?
I want to add this query to Postbix in order to monitor if the "wal keep 
segments" parameter is too short, like having an alert at 70%, for example.

Thanks,

Edson



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