Ian Barwick c560dfbbce cluster show: display timeline ID ...

This helps provide a better picture of the state of the cluster, i.e.
making it more obvious whether there's been a timeline divergence.

This also provides infrastructure for further improvements in cluster
status display and diagnosis.

Note this is only available in PostgreSQL 9.6 and later as it relies
on the SQL functions for interrogating pg_control, which can be executed
remotely. As PostgreSQL 9.5 will shortly be the only community-supported
version without these functions, it's not worth the effort of trying
to duplicate their functionality.

2019-05-27 09:39:19 +09:00

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