Summary

When an admin is utilizing Read-Only to have one node to perform administrative tasks such as reindex, he/she would want to exclude user traffic (load balancer) to that particular node.

Issue Statement

The admin would have to manually configure it in the load balancer and revert the changes after the maintenance tasks complete. Currently, when Confluence is in 'read-only' mode, /status will return "RUNNING".

Proposed Solution

As the load balancer is already utilizing the JSON response from /status to determine instance health, it makes sense for the node to return "Maintenance" when it's in "Read-Only" mode so that the admin can configure the load balancer to not redirect traffic while it's in "Maintenance" mode automatically.

Side Note

For this to work, when the whole cluster is going on "Read-Only" mode, one dedicated node (that are performing the tasks) has to be nominated to return the Maintenance status, so only one particular node is excluded from the load balancer pool.