This adds a paragraph to the Standby Cluster section clarifying that the standby cluster is independent of the primary cluster and not visible from the primary cluster's Patroni interface.
Close#2090
This allows to have multiple hosts in a standby_cluster and ensures that the standby leader follows the main cluster's new leader after a switchover.
Partially addresses #2189
Sphinx' add_stylesheet() has been deprecated for a long time and got removed in recent versions of sphinx. If available, use add_css_file() instead.
Close#2079.
This field notes the last time (as unix epoch) a cluster member has successfully communicated with the DCS. This is useful to identify and/or analyze network partitions.
Also, expose dcs_last_seen in the MemberStatus class and its from_api_response() method.
This adds the `selector` to the Patroni Kubernetes StatefulSet spec
Without it, one gets errors like
```
error: error validating "patroni_k8s.yaml": error validating data: ValidationError(StatefulSet.spec): missing required field "selector" in io.k8s.api.apps.v1.StatefulSetSpec; if you choose to ignore these errors, turn validation off with --validate=false
```
(as mentioned in #1867)
