Confluence database validation value is false by default

Issue Summary

The Confluence database validation default value is false in Docker template https://bitbucket.org/atlassian-docker/docker-atlassian-confluence-server/src/master/config/confluence.cfg.xml.j2

This default setting seems to contradict Confluence public documentation:

• https://confluence.atlassian.com/doc/surviving-database-connection-closures-297665664.html

  This validation query is enabled by default on new installations (from Confluence 6.5 and later)

This is reproducible on Data Center:

Steps to Reproduce

1. Pull the docker image from https://hub.docker.com/r/atlassian/confluence-server/
2. Setup Confluence server or 2 nodes cluster
3. Check the confluence.cfg.xml file in the Confluence home directory

Expected Results

<property name="hibernate.c3p0.validate">{{ atl_db_validate | default('true') }}</property>

Actual Results

<property name="hibernate.c3p0.validate">{{ atl_db_validate | default('false') }}</property>

Workaround

Docker:

Set the variable "ATL_DB_VALIDATE=true"

kubernetes:

Add the variable to values.yaml

  additionalEnvironmentVariables:
    - name: ATL_DB_VALIDATE
      value: true