We need a new version of Zuul on Jessie for contint1001 and thus have to upgrade it on scandium.eqiad.wmnet (Jessie zuul-merger).
This task is a blocker to migrating Zuul from gallium to contint1001.
Package has been recently updated to 2.1.0-391-gbc58ea3-wmf2jessie1 via T140894 but the .deb hasn't been added to apt.wikimedia.org since the orig tarball was missing from the .changes file.
Package
======
I have prepared a new package at: https://people.wikimedia.org/~hashar/debs/zuul_2.5.0-8-gcbc7f62-wmf2jessie1/
It will need to be pushed to apt.wikimedia.org under `jessie-wikimedia/thirdparty`.
Upgrade
======
```
ssh scandium.eqiad.wmnet
service zuul-merger stop
apt-get update
apt-cache policy zuul
```
Make sure version is `zuul_2.5.0-8-gcbc7f62-wmf2jessie1`
```
apt-get install zuul
```
The package will restart the service. Then watch `/var/log/zuul/merger.log`.
Rollback
----------
`service zuul-merger stop`
Reinstall Zuul using the version from apt.wikimedia.org `2.1.0-391-gbc58ea3-wmf2jessie1`.
`service zuul-merger start`
Watch `/var/log/zuul/merger.log`