Is it possible to have a 'custom' change-id in a gerrit commit message?
- My commit message
(missing or invalid Change-Id line format in commit message footer)
No, you can't. You need to use Gerrit's own Change-Id format. You can have one autogenerated for your commit by installing the commit-msg hook script included with Gerrit. More information is available at the Gerrit Change-Ids documentation.