Bug 1609967 - [ci] Remove 'seta_15_180' shadow-scheduler task, r=jmaher

Differential Revision: https://phabricator.services.mozilla.com/D60550

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

taskcluster/ci/source-test/shadow-scheduler.yml

@@ -32,14 +32,3 @@ relevant_tests:
     worker:
         env:
             TASKGRAPH_OPTIMIZE_STRATEGIES: taskgraph.optimize:relevant_tests
-
-seta_15_180:
-    description: Runs the seta_15_180 experimental optimization strategy
-    treeherder:
-        symbol: SS(seta_15_180)
-    index:
-        product: source
-        job-name: shadow-scheduler-seta_15_180
-    worker:
-        env:
-            TASKGRAPH_OPTIMIZE_STRATEGIES: taskgraph.optimize:seta_15_180

taskcluster/taskgraph/optimize/__init__.py

@@ -318,9 +318,3 @@ register_strategy('test-try', args=('skip-unless-schedules',))(Alias)
 relevant_tests = {
     'test': Either('skip-unless-schedules', 'skip-unless-has-relevant-tests'),
 }
-
-# A variation of SETA that runs all tasks every 10th push or 2 hours.
-seta_15_180 = {
-    'seta': Alias('seta_15_180'),
-    'test': Either('skip-unless-schedules', 'seta_15_180'),
-}

taskcluster/taskgraph/optimize/seta.py

@@ -264,7 +264,6 @@ is_low_value_task = SETA().is_low_value_task
 
 
 @register_strategy('seta', args=(10, 60))
-@register_strategy('seta_15_180', args=(15, 180))
 class SkipLowValue(OptimizationStrategy):
 
     def __init__(self, push_interval, time_interval):