<pre class="language-auto" tabindex="0"><code class="language-auto">flowchart TD hook_fired([peer-relation-changed Hook]) --&gt; has_cluster_initialised{Has cluster\n initialised?} has_cluster_initialised -- no --&gt; defer&gt;defer] has_cluster_initialised -- yes --&gt; is_leader{Is current\nunit leader?} is_leader -- no --&gt; is_part_of_cluster{Is current unit \n part of the cluster?} is_leader -- yes --&gt; all_units_on_cluster{Are all the units \n part of the cluster?} all_units_on_cluster -- yes --&gt; is_part_of_cluster all_units_on_cluster -- no --&gt; are_all_members_ready{Are all cluster \n members ready?} %% This defer should have a return after it to stop the execution. are_all_members_ready -- no --&gt; defer2&gt;defer] defer2 --&gt; is_part_of_cluster are_all_members_ready -- yes --&gt; add_unit_to_cluster[Add unit to cluster] add_unit_to_cluster --&gt; patch_pod_labels[Patch pod labels of the new cluster member] patch_pod_labels --&gt; all_units_on_cluster is_part_of_cluster -- no --&gt; rtn([return]) is_part_of_cluster -- yes --&gt; update_config[Update Patroni and \n PostgreSQL config \n] update_config --&gt; restart_postgresql[Restart PostgreSQL \n if TLS is turned on/off] restart_postgresql --&gt; has_member_started{Have Patroni and \n PostgreSQL started in \n the current unit?} has_member_started -- no --&gt; defer3&gt;defer] %% Here also the legacy relations' standby field should be updated. has_member_started -- yes --&gt; update_read_only_endpoint[Update the read-only endpoint \n in the database relation] update_read_only_endpoint --&gt; set_active[Set Active\n Status] set_active --&gt; rtn2([return]) </code></pre>

<pre class="language-auto" tabindex="0"><code class="language-auto">flowchart TD hook_fired([peer-relation-changed Hook]) --&gt; is_leader_and_is_not_departing{Is leader and \n is not departing?} is_leader_and_is_not_departing -- no --&gt; rtn([return]) is_leader_and_is_not_departing -- yes --&gt; has_cluster_initialised{Has cluster\n initialised?} has_cluster_initialised -- no --&gt; defer&gt;defer] %% Here also the legacy relations' standby field should be updated. has_cluster_initialised -- yes --&gt; update_read_only_endpoint[Update the read-only endpoint \n in the database relation] update_read_only_endpoint --&gt; remove_departing_units[Remove departing units \n from the cluster] remove_departing_units --&gt; update_config[Turn on/off PostgreSQL \n synchronous_commit configuration] update_config --&gt; rtn2([return]) </code></pre>