Auto-reboot the chromium.gpu and chromium.gpu.fyi bots.

masters/master.chromium.gpu/slaves.cfg

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 slaves = [
   {
     'master': 'ChromiumGPU',
     'hostname': 'vm88-m1',
     'builder': 'GPU Win Builder',
     'os': 'win',
     'version': 'win7',
     'bits': '64',
     'recipe': 'chromium',
     'build_config': 'Release',
     'gatekeeper_categories': 'compile',
-    # This bot only does builds and it seems sub-optimal to reboot in between.
-    'auto_reboot': False,
+    # All bots on these waterfalls are auto-rebooted between runs for stability.
   },
   {
     'master': 'ChromiumGPU',
     'hostname': 'vm89-m1',
     'builder': 'GPU Win Builder (dbg)',
     'os': 'win',
     'version': 'win7',
     'bits': '64',
     'recipe': 'chromium',
     'build_config': 'Debug',
-    # This bot only does builds and it seems sub-optimal to reboot in between.
-    'auto_reboot': False,
+    # All bots on these waterfalls are auto-rebooted between runs for stability.
   },
   {
     'master': 'ChromiumGPU',
     'hostname': 'vm90-m1',
     'builder': 'Win7 Release (NVIDIA)',
     'os': 'win',
     'version': 'win7',
     'bits': '64',
     'recipe': 'chromium',
     'build_config': 'Release',
     # This bot uses recipe-side triggers.
     'triggered_by': 'none',
-    # This bot only triggers and collects Swarming results and doesn't
-    # need to be auto-rebooted.
-    'auto_reboot': False,
+    # All bots on these waterfalls are auto-rebooted between runs for stability.
     'gatekeeper_categories': 'testers',
   },
   {
     'master': 'ChromiumGPU',
     'hostname': 'vm91-m1',
     'builder': 'Win7 Debug (NVIDIA)',
     'os': 'win',
     'version': 'win7',
     'bits': '64',
     'recipe': 'chromium',
     'build_config': 'Debug',
     # This bot uses recipe-side triggers.
     'triggered_by': 'none',
-    # This bot only triggers and collects Swarming results and doesn't
-    # need to be auto-rebooted.
-    'auto_reboot': False,
+    # All bots on these waterfalls are auto-rebooted between runs for stability.
   },
   {
     'master': 'ChromiumGPU',
     'hostname': 'vm101-m1',
     'builder': 'Win7 Release (ATI)',
     'os': 'win',
     'version': 'win7',
     'bits': '64',
     'recipe': 'chromium',
     'build_config': 'Release',
     # This bot uses recipe-side triggers.
     'triggered_by': 'none',
-    # This bot only triggers and collects Swarming results and doesn't
-    # need to be auto-rebooted.
-    'auto_reboot': False,
+    # All bots on these waterfalls are auto-rebooted between runs for stability.
   },
   {
     'master': 'ChromiumGPU',
     'hostname': 'vm612-m1',
     'builder': 'GPU Mac Builder',
     'os': 'mac',
     'version': '10.8',
     'bits': '64',
     'recipe': 'chromium',
     'build_config': 'Release',
     'gatekeeper_categories': 'compile',
-    # This bot only does builds and it seems sub-optimal to reboot in between.
-    'auto_reboot': False,
+    # All bots on these waterfalls are auto-rebooted between runs for stability.
   },
   {
     'master': 'ChromiumGPU',
     'hostname': 'vm616-m1',
     'builder': 'GPU Mac Builder (dbg)',
     'os': 'mac',
     'version': '10.8',
     'bits': '64',
     'recipe': 'chromium',
     'build_config': 'Debug',
-    # This bot only does builds and it seems sub-optimal to reboot in between.
-    'auto_reboot': False,
+    # All bots on these waterfalls are auto-rebooted between runs for stability.
   },
   {
     'master': 'ChromiumGPU',
     'hostname': 'vm75-m1',
     'builder': 'Mac 10.10 Release (Intel)',
     'os': 'mac',
     'version': '10.10',
     'bits': '64',
     'recipe': 'chromium',
     'build_config': 'Release',
     # This bot uses recipe-side triggers.
     'triggered_by': 'none',
-    # This bot only triggers and collects Swarming results and doesn't
-    # need to be auto-rebooted.
-    'auto_reboot': False,
+    # All bots on these waterfalls are auto-rebooted between runs for stability.
   },
   {
     'master': 'ChromiumGPU',
     'hostname': 'vm76-m1',
     'builder': 'Mac 10.10 Debug (Intel)',
     'os': 'mac',
     'version': '10.10',
     'bits': '64',
     'recipe': 'chromium',
     'build_config': 'Debug',
     # This bot uses recipe-side triggers.
     'triggered_by': 'none',
-    # This bot only triggers and collects Swarming results and doesn't
-    # need to be auto-rebooted.
-    'auto_reboot': False,
+    # All bots on these waterfalls are auto-rebooted between runs for stability.
   },
   {
     'master': 'ChromiumGPU',
     'hostname': 'vm77-m1',
     'builder': 'Mac Retina Release',
     'os': 'mac',
     'version': '10.9',
     'bits': '64',
     'recipe': 'chromium',
     'build_config': 'Release',
     # This bot uses recipe-side triggers.
     'triggered_by': 'none',
-    # This bot only triggers and collects Swarming results and doesn't
-    # need to be auto-rebooted.
-    'auto_reboot': False,
+    # All bots on these waterfalls are auto-rebooted between runs for stability.
     'gatekeeper_categories': 'testers',
   },
   {
     'master': 'ChromiumGPU',
     'hostname': 'vm78-m1',
     'builder': 'Mac Retina Debug',
     'os': 'mac',
     'version': '10.9',
     'recipe': 'chromium',
     'build_config': 'Debug',
     'bits': '64',
     # This bot uses recipe-side triggers.
     'triggered_by': 'none',
-    # This bot only triggers and collects Swarming results and doesn't
-    # need to be auto-rebooted.
-    'auto_reboot': False,
+    # All bots on these waterfalls are auto-rebooted between runs for stability.
   },
   {
     'master': 'ChromiumGPU',
     'hostname': 'vm79-m1',
     'builder': 'Mac 10.10 Retina Release (AMD)',
     'os': 'mac',
     'version': '10.10',
     'bits': '64',
     'recipe': 'chromium',
     'build_config': 'Release',
     # This bot uses recipe-side triggers.
     'triggered_by': 'none',
-    # This bot only triggers and collects Swarming results and doesn't
-    # need to be auto-rebooted.
-    'auto_reboot': False,
+    # All bots on these waterfalls are auto-rebooted between runs for stability.
   },
   {
     'master': 'ChromiumGPU',
     # TODO(kbr): consider switching this to a VM and putting this Mac
     # Mini in the swarming pool. Or is the Mini less expensive than a
     # Mac VM?
     'hostname': 'build180-m1',
     'builder': 'Mac 10.10 Retina Debug (AMD)',
     'os': 'mac',
     'version': '10.10',
     'bits': '64',
     'recipe': 'chromium',
     'build_config': 'Debug',
     # This bot uses recipe-side triggers.
     'triggered_by': 'none',
-    # This bot only triggers and collects Swarming results and doesn't
-    # need to be auto-rebooted.
-    'auto_reboot': False,
+    # All bots on these waterfalls are auto-rebooted between runs for stability.
   },
   {
     'master': 'ChromiumGPU',
     'hostname': 'slave62-c1',
     'builder': 'GPU Linux Builder',
     'os': 'linux',
     'version': 'precise',
     'bits': '64',
     'recipe': 'chromium',
     'build_config': 'Release',
     'gatekeeper_categories': 'compile',
-    # This bot only does builds and it seems sub-optimal to reboot in between.
-    'auto_reboot': False,
+    # All bots on these waterfalls are auto-rebooted between runs for stability.
   },
   {
     'master': 'ChromiumGPU',
     'hostname': 'slave63-c1',
     'builder': 'GPU Linux Builder (dbg)',
     'os': 'linux',
     'version': 'precise',
     'bits': '64',
     'recipe': 'chromium',
     'build_config': 'Debug',
-    # This bot only does builds and it seems sub-optimal to reboot in between.
-    'auto_reboot': False,
+    # All bots on these waterfalls are auto-rebooted between runs for stability.
   },
   {
     'master': 'ChromiumGPU',
     'hostname': 'slave65-c1',
     'subdir': '0',
     'builder': 'Linux Release (NVIDIA)',
     'os': 'linux',
     'version': 'precise',
     'bits': '64',
     'recipe': 'chromium',
     'build_config': 'Release',
     # This bot uses recipe-side triggers.
     'triggered_by': 'none',
-    # This bot only triggers and collects Swarming results and doesn't
-    # need to be auto-rebooted.
+    # This physical host is shared between multiple builders and can't
+    # be auto-rebooted.
     'auto_reboot': False,
     'gatekeeper_categories': 'testers',
   },
   {
     'master': 'ChromiumGPU',
     'hostname': 'slave65-c1',
     'subdir': '1',
     'builder': 'Linux Debug (NVIDIA)',
     'os': 'linux',
     'version': 'precise',
     'bits': '64',
     'recipe': 'chromium',
     'build_config': 'Debug',
     # This bot uses recipe-side triggers.
     'triggered_by': 'none',
-    # This bot only triggers and collects Swarming results and doesn't
-    # need to be auto-rebooted.
+    # This physical host is shared between multiple builders and can't
+    # be auto-rebooted.
     'auto_reboot': False,
   },
   {
     'master': 'ChromiumGPU',
     'hostname': 'build59-b1',
     'builder': 'Android Debug (Nexus 5)',
     'os': 'linux',
     'version': 'precise',
     'bits': '64',
   },
   {
     'master': 'ChromiumGPU',
     'hostname': 'build60-b1',
     'builder': 'Android Debug (Nexus 6)',
     'os': 'linux',
     'version': 'precise',
     'bits': '64',
   },
   {
     'master': 'ChromiumGPU',
     'hostname': 'build61-b1',
     'builder': 'Android Debug (Nexus 9)',
     'os': 'linux',
     'version': 'precise',
     'bits': '64',
   },
 ]