Issue Summary

On application startup, if the database is down the Bitbucket application displays the sensitive database hostname & port details in the error message in browser.
Error Message:

The database, as currently configured, is not accessible.
Connection to <DB-HOSTNAME>:<PORT> refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.

This is reproducible on Data Center: (yes)

Steps to Reproduce

1. Shutdown both the Bitbucket application and the external database.
2. Start the Bitbucket application and access the <BITBUCKET-BASE-URL> in the browser.

Expected Results

The error message in the browser should display generic database connectivity issue.

Actual Results

The error message in the browser displays the sensitive <DB-HOSTNAME>:<PORT> that can be seen by any user accessing the Bitbucket base url at that time.

The database, as currently configured, is not accessible.
Connection to <DB-HOSTNAME>:<PORT> refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.

Workaround

Currently no workaround to hide this sensitive details in the error message.