Use stable tree timer rather than Nightly scheduler for refleak builds (

#515)

* Replace 'Nightly' schedulers

Instead of once per day, they now wait for 1 hour after any change
before starting a build (that is, if there is a change made and 59
minutes elapse before another change, the scheduler will wait another
hour before starting a build containing both changes.

The hope is that this will do a few things for us:
- Avoid blocking workers that do refleak builds in addition to other
  builds:
    - Don't build branches that haven't changed (this could also be
      accomplished by adding 'onlyIfChanged=True' to the existing
      'Nightly' schedulers)
    - Non-refleak builds should have time to finish up before refleak
      build(s) start (caveat: a refleak build on one branch may still
      block builds of other branches)
- Associate refleak builds with actual changes

* Remove superflous DAILYBUILDERS list

They were exclusively refleak builders, which are now detected by tag.

master/custom/builders.py

@@ -335,32 +335,6 @@ def get_builders(settings):
     return all_builders
 
 
-DAILYBUILDERS = [
-    "AMD64 Windows11 Refleaks",
-    "AMD64 Fedora Rawhide Refleaks",
-    "AMD64 Fedora Stable Refleaks",
-    "AMD64 RHEL8 Refleaks",
-    "AMD64 CentOS9 Refleaks",
-    "AMD64 Fedora Rawhide NoGIL refleaks",
-    # Linux PPC64LE
-    "PPC64LE Fedora Rawhide Refleaks",
-    "PPC64LE Fedora Stable Refleaks",
-    "PPC64LE RHEL8 Refleaks",
-    "PPC64LE CentOS9 Refleaks",
-    "PPC64LE Fedora Rawhide NoGIL refleaks",
-    # Linux s390x
-    "s390x Fedora Rawhide Refleaks",
-    "s390x Fedora Refleaks",
-    "s390x RHEL9 Refleaks",
-    "s390x RHEL8 Refleaks",
-    # Linux aarch64
-    "aarch64 Fedora Rawhide Refleaks",
-    "aarch64 Fedora Stable Refleaks",
-    "aarch64 RHEL8 Refleaks",
-    "aarch64 CentOS9 Refleaks",
-    "aarch64 Fedora Rawhide NoGIL refleaks",
-]
-
 # Match builder name (excluding the branch name) of builders that should only
 # run on the main and "custom" branches.
 ONLY_MAIN_BRANCH = (

master/master.cfg

@@ -48,7 +48,6 @@ from custom.release_dashboard import get_release_status_app    # noqa: E402
 from custom.builders import (  # noqa: E402
     get_builders,
     STABLE,
-    DAILYBUILDERS,
     ONLY_MAIN_BRANCH,
     TIER_1,
     TIER_2,
@@ -207,7 +206,7 @@ mail_status_builders = []
 
 for branch_num, (git_url, branchname, git_branch) in enumerate(git_branches):
     buildernames = []
-    dailybuildernames = []
+    refleakbuildernames = []
     for name, worker_name, buildfactory, stability, tier in BUILDERS:
         if any(
             pattern in name for pattern in ONLY_MAIN_BRANCH
@@ -245,8 +244,8 @@ for branch_num, (git_url, branchname, git_branch) in enumerate(git_branches):
             elif "nondebug" not in tags and branchname in {"3.11", "3.12"}:
                 continue
 
-        if name in DAILYBUILDERS:
-            dailybuildernames.append(buildername)
+        if 'refleak' in tags:
+            refleakbuildernames.append(buildername)
         else:
             buildernames.append(buildername)
         if all(pattern not in buildername for pattern in NO_NOTIFICATION):
@@ -277,14 +276,18 @@ for branch_num, (git_url, branchname, git_branch) in enumerate(git_branches):
             fileIsImportant=is_important_change,
         )
     )
-    if dailybuildernames:
+    if refleakbuildernames:
         c["schedulers"].append(
-            schedulers.Nightly(
-                name=branchname + "-daily",
-                hour=int(branch_num / (len(git_branches) - 1) * 23),
-                minute=0,
+            schedulers.SingleBranchScheduler(
+                name=branchname + "-refleak",
                 change_filter=util.ChangeFilter(branch=git_branch),
-                builderNames=dailybuildernames,
+                # Wait this many seconds for no commits before starting a build
+                # NB: During extremely busy times, this can cause the builders
+                # to never actually fire.  The current expectation is that it
+                # won't ever actually be that busy, but we need to keep an eye
+                # on that.
+                treeStableTimer=1 * 60 * 60,  # h * m * s
+                builderNames=refleakbuildernames,
             )
         )