So there were two issues currently:

1) gerrit-to-redis was not running. From https://wikitech.wikimedia.org/wiki/Nova_Resource:Tools.gerrit-to-redis/SAL :
19:46 valhallasw: grrrit-wm still not reporting anything; checking redis stream
19:50 valhallasw: gerrit-to-redis reconnects to gerrit every two hours, but does not push to clients (last 'pushed to 1 clients' message was 26-10-2014 04:00:41,241)
19:51 valhallasw: and gerrit-to-redis does not seem to be running ATM - qstat is empty
19:53 valhallasw: job resubmitted; now running on continuous@tools-exec-10; SSH and redis connections are open
19:57 valhallasw: "2014-10-26 19:56:30,333 Pushed to 1 clients"

2) grrrit-wm could not join #wikimedia-growth, and does not handle that correctly:
https://wikitech.wikimedia.org/wiki/Nova_Resource:Tools.lolrrit-wm/SAL

20:02 valhallasw: 2014-10-26T20:01:00.911Z - error: prefix=hitchcock.freenode.net, server=hitchcock.freenode.net, command=err_channelisfull, rawCommand=471, commandType=error, args=[grrrit-wm1, #wikimedia-growth, Cannot join channel (+l) - channel is full, try again later]
20:02 valhallasw: but I'm not sure if thta's the actual cause...
20:11 valhallasw: kicked #wikimedia-growth from the config, let's see if that helps
20:15 valhallasw: judging from the log, that seems to have been the issue indeed


The following is in the log:

2014-10-26T02:51:40.222Z - info: joining channels 0=#mediawiki-i18n, 1=#mediawiki-parsoid, 2=#mediawiki-visualeditor, 3=#pywikibot, 4=#semantic-mediawiki, 5=#wikimedia-analytics, 6=#wikimedia-dev, 7=#wikimedia-fundraising, 8=#wikimedia-corefeatures, 9=#wikimedia-labs, 10=#wikimedia-mobile, 11=#wikimedia-operations, 12=#wikimedia-qa, 13=#wikidata, 14=#wikimedia-growth, 15=#wikimedia-multimedia, 16=#wikipedia-en-ambassadors, 17=#wmt, 18=#brickimedia, 19=#mediawiki-feed
2014-10-26T02:51:49.403Z - info: Joined channel #mediawiki-i18n
(...)
2014-10-26T02:51:58.412Z - error:  prefix=wilhelm.freenode.net, server=wilhelm.freenode.net, command=err_channelisfull, rawCommand=471, commandType=error, args=[grrrit-wm, #wikimedia-growth, Cannot join channel (+l) - channel is full, try again later]
2014-10-26T02:51:59.411Z - info: Joined channel #wikimedia-multimedia
(...)
2014-10-26T02:52:03.426Z - info: Joined channel #mediawiki-feed
2014-10-26T02:53:52.211Z - info: joining channels 0=#mediawiki-i18n, 1=#mediawiki-parsoid, 2=#mediawiki-visualeditor, 3=#pywikibot, 4=#semantic-mediawiki, 5=#wikimedia-analytics, 6=#wikimedia-dev, 7=#wikimedia-fundraising, 8=#wikimedia-corefeatures, 9=#wikimedia-labs, 10=#wikimedia-mobile, 11=#wikimedia-operations, 12=#wikimedia-qa, 13=#wikidata, 14=#wikimedia-growth, 15=#wikimedia-multimedia, 16=#wikipedia-en-ambassadors, 17=#wmt, 18=#brickimedia, 19=#mediawiki-feed
(repeats)


After kicking #wikimedia-growth out:

2014-10-26T20:12:23.103Z - info: joining channels 0=#mediawiki-i18n, 1=#mediawiki-parsoid, 2=#mediawiki-visualeditor, 3=#pywikibot, 4=#semantic-mediawiki, 5=#wikimedia-analytics, 6=#wikimedia-dev, 7=#wikimedia-fundraising, 8=#wikimedia-corefeatures, 9=#wikimedia-labs, 10=#wikimedia-mobile, 11=#wikimedia-operations, 12=#wikimedia-qa, 13=#wikidata, 14=#wikimedia-multimedia, 15=#wikipedia-en-ambassadors, 16=#wmt, 17=#brickimedia, 18=#mediawiki-feed
2014-10-26T20:12:32.315Z - info: Joined channel #mediawiki-i18n
(..)
2014-10-26T20:12:45.365Z - info: Joined channel #mediawiki-feed
2014-10-26T20:12:45.366Z - info: Joined 19 channels. Starting relay
2014-10-26T20:12:51.784Z - info: Sent message from apps/android/wikipedia to #wikimedia-mobile




So, instead of retrying to join *all* channels when one fails, the bot should rather set up the relay for the joined channels, and try re-joining the failed channels.