Bug 1831143 - use new mozillareleases/gecko_decision:4.1.0 docker image. r=releng-reviewers,bhearsum

Also bumping the cache version, because mercurial 6.1 enabled
share-safe, and robustcheckout in the old image doesn't understand that,
so upon encountering a repo cloned with the new version it would delete
everything and re-clone from scratch.

Differential Revision: https://phabricator.services.mozilla.com/D186543

Bug 1827709: Notify Thunderbird CI Matrix channel after mozilla-central push. r=releng-reviewers,gabriel

This notification will help Thunderbird developers who are tasked with pushing
multiple bugs to comm-central after a mozilla-central push.

Taskgraph tests adjusted to verify the notification is only sent for pushes
to mozilla-central, and to run the tests when .taskcluster.yml is updated.

Differential Revision: https://phabricator.services.mozilla.com/D175290

Bug 1827709: Notify Thunderbird CI Matrix channel after mozilla-central push. r=releng-reviewers,gabriel

This notification will help Thunderbird developers who are tasked with pushing
multiple bugs to comm-central after a mozilla-central push.

Differential Revision: https://phabricator.services.mozilla.com/D175290

Differential Revision: https://phabricator.services.mozilla.com/D159839

Differential Revision: https://phabricator.services.mozilla.com/D159839

Differential Revision: https://phabricator.services.mozilla.com/D155978

Differential Revision: https://phabricator.services.mozilla.com/D155978

Bug 1762128 - bump the cache name for decision images to stop interfering with other trees. r=releng-reviewers,ahal a=release

hg 4.8 (e.g. from the v3.0.1 decision image) seems to choke on cached repos
created with 5.8 (from v4.0.0).

Differential Revision: https://phabricator.services.mozilla.com/D142455

Differential Revision: https://phabricator.services.mozilla.com/D142280

For a long time two copies of the 'taskgraph' module have existed in parallel.
We've attempted to keep them in sync, but over time they have diverged and the
maintenance burden has increased.

In order to reduce this burden, we'd like to re-join the two code bases. The
canonical repo will be the one that lives outside of mozilla-central, and this
module will depend on it. Since they both have the same module name (taskgraph)
we need to rename the version in mozilla-central to avoid collisions.

Other consumers of 'taskgraph' (like mobile repos) have standardized on
'<project>_taskgraph' as their module names. So replicating that here as well.

Differential Revision: https://phabricator.services.mozilla.com/D127118

Differential Revision: https://phabricator.services.mozilla.com/D122524

Decision task durations have been creeping over the 20 minute mark, which means
we no longer have a lot of leeway when things timeout (like waiting for
bugbug). Longer term we should focus on reducing Decision task duration, but
for now this is needed to re-open autoland.

Differential Revision: https://phabricator.services.mozilla.com/D120644

Differential Revision: https://phabricator.services.mozilla.com/D108423

Bug 1666809 - Insert decision task indexes directly via taskluster API rather than index-task, r=taskgraph-reviewers,aki

We started using the "backstop" index added by bug 1660506 to determine whether
a push should be a backstop based on a time interval. The problem is that this
index gets added by an index-task that runs after the decision task has
completed.  Therefore, if two pushes land at roughly the same time (i.e, the
second decision task starts before the first completes), then they can both
determine themselves as backstops.

This patch gets around the problem by inserting the "backstop" index as early
as possible (immediately after resolving parameters), so the chances of this
happening become very low. It's still theoretically possible that it could
happen again, but we don't need this to be 100% perfect. As long as it is rare,
it's good enough.

Depends on D91191

Differential Revision: https://phabricator.services.mozilla.com/D91192

Differential Revision: https://phabricator.services.mozilla.com/D83212

No bug: Update links to hg.mozilla.org to use `default` instead of `tip` in `taskcluster/`; r=Callek

The latter sometimes bites us if we have a legacy support branch that gets
pushed more recently than default.

Differential Revision: https://phabricator.services.mozilla.com/D82628

Differential Revision: https://phabricator.services.mozilla.com/D82627

Differential Revision: https://phabricator.services.mozilla.com/D77864

Treeherder ignores this.

Differential Revision: https://phabricator.services.mozilla.com/D82251

This bring mozilla-central in line with other projects.

Differential Revision: https://phabricator.services.mozilla.com/D82248

Differential Revision: https://phabricator.services.mozilla.com/D82247

Differential Revision: https://phabricator.services.mozilla.com/D82246

Differential Revision: https://phabricator.services.mozilla.com/D82245

These are provied by the worker directly, now.

Differential Revision: https://phabricator.services.mozilla.com/D82244

Differential Revision: https://phabricator.services.mozilla.com/D82243

Differential Revision: https://phabricator.services.mozilla.com/D81270

To help support KaiOS, we are running the kaios project branch in automation, with a
different trust domain. Factor out the usages of `trust-domain` in `.taskcluster.yml`
to make it easy for the kaios branch to merge changes from mozilla-central.

Differential Revision: https://phabricator.services.mozilla.com/D75242

Differential Revision: https://phabricator.services.mozilla.com/D75241

To help support KaiOS, we are running the kaios project branch in automation, with a
different trust domain. Factor out the usages of `trust-domain` in `.taskcluster.yml`
to make it easy for the kaios branch to merge changes from mozilla-central.

Differential Revision: https://phabricator.services.mozilla.com/D75242

Differential Revision: https://phabricator.services.mozilla.com/D75241

Differential Revision: https://phabricator.services.mozilla.com/D70568

--HG--
extra : moz-landing-system : lando

Differential Revision: https://phabricator.services.mozilla.com/D68250

--HG--
extra : moz-landing-system : lando

Differential Revision: https://phabricator.services.mozilla.com/D58638

--HG--
extra : moz-landing-system : lando

Differential Revision: https://phabricator.services.mozilla.com/D50357

--HG--
extra : moz-landing-system : lando

Differential Revision: https://phabricator.services.mozilla.com/D48457

--HG--
extra : source : 1e29bf90b3ea69e9e7c026f4626ac11bba762689
extra : amend_source : bf551282203dbf6553e9eba534a4eca7eff93696

Backed out changeset 1e29bf90b3ea (bug 1580622) for breaking retriggers, backfill and reruns on autoland

Differential Revision: https://phabricator.services.mozilla.com/D48457

--HG--
extra : moz-landing-system : lando