Add Sentinel Master units ip to the app databag

[alithethird]

When multiple units of Redis is deployed the units put their ip into the unit databag and consumer charms can not find which unit is the leader. An example bug is here: canonical/discourse-k8s-operator#268

This also fixes the issue where after a reboot the consumer charm doesn't refresh the redis ip. Ip refreshes in the unit databag but the charm doesn't read that because its cashed. An example bug is here: https://bugs.launchpad.net/juju/+bug/2063087

Adding the Sentinel Master units ip to the app databag would fix both of these bugs.

[syncronize-issues-to-jira]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/DPE-5200.

This message was autogenerated

[reneradoi]

Hello @alithethird thanks for creating this request. Just for clarification: You need the Redis Sentinel leader information, not the juju leader, correct?

[alithethird]

Hi @reneradoi. Thanks for the answer. Sorry I am not very familiar with and thought they were the same. I need the one that has write access to the database. That is the Sentinel leader I guess?

[reneradoi]

Yes @alithethird that would be the Sentinel leader.

[alithethird]

Thanks for clarifying that. I will update the issue accordingly.

[AmberCharitos]

This is also impacting the Commercial Systems team deployment of Superset. Commenting here for visibility. I see there is a PR to resolve so will monitor that.

[reneradoi]

New version has been released as revision 35 to Charmhub.

[alithethird]

Thanks a lot!

[reneradoi]

Closing the issue as this has been provided with #96.