Change 339044 had a related patch set uploaded (by Reedy):
Update monolog from 1.18.2 to 1.22.0

https://gerrit.wikimedia.org/r/339044

Change 339046 had a related patch set uploaded (by Reedy):
Update monolog from 1.18.2 to 1.22.0

https://gerrit.wikimedia.org/r/339046

PhpStorms static analysis doesn't see anything wrong in that sense...

https://github.com/Seldaek/monolog/releases/tag/1.21.0

Break: Reverted the addition of $context when the ErrorHandler handles regular php errors from 1.20.0 as it was causing issues

We were never on 1.20, so that isn't a problem

For https://github.com/Seldaek/monolog/releases/tag/1.19.0

Break: StreamHandler will not close streams automatically that it does not own. If you pass in a stream (not a path/url), then it will not close it for you. You can retrieve those using getStream() if needed

Targets
    Occurrences of 'StreamHandler' in Directory /Users/reedy/PhpstormProjects/MediaWiki/core/includes/debug/logger
Found Occurrences  (2 usages found)
    Usage in comments  (2 usages found)
        MediaWiki  (2 usages found)
            core/includes/debug/logger  (1 usage found)
                MonologSpi.php  (1 usage found)
                    74 *               'class'     => '\\Monolog\\Handler\\StreamHandler',
            core/includes/debug/logger/monolog  (1 usage found)
                LegacyHandler.php  (1 usage found)
                    44 * replacement for \Monolog\Handler\StreamHandler.

Neither of which are affected by that break

The master branch is the 2.0 release (see https://github.com/Seldaek/monolog/issues/197) and requires PHP 7 (so a bump to 2.0 would require to bump MW requirements before). It seems that the master branch and the 1.x branch are quite kept in sync, there are a lot of merges from 1.x to master, meaning that most issues are fixed both in 1.x and in master.

Note also that a commit (5bc1e18, 18 December 2015) says that HHVM support was dropped “for now” in master branch.

Cheers for the heads up.

All the more reason to get to 1.22 then i guess, I'm guessing there won't be a 1.23, but maybe some 1.22 point releases for some bug fixes if anything is found

The chances of us bumping to a min supported PHP 7 version in MW isn't likely to happen for a while, and certainly, dropping "hhvm support" would be a blocker, if that was the case (looking at https://github.com/Seldaek/monolog/commit/5bc1e18 it looked mostly like a workaround for travis, rather than actual "hhvm support" in the code)

Change 339044 merged by jenkins-bot:
[mediawiki/vendor@master] Update monolog from 1.18.2 to 1.22.1

https://gerrit.wikimedia.org/r/339044

Change 339046 merged by jenkins-bot:
[mediawiki/core@master] Update monolog from 1.18.2 to 1.22.1

https://gerrit.wikimedia.org/r/339046