Here is the most recent purple build:

https://uberchromegw.corp.google.com/i/chromium.perf/builders/Android%20Nexus5X%20Perf/builds/898

build73-b1 was down and subsequently all its devices were down.

The host was brought back up a little while ago.  Devices are back too.

swarming.py bots -S https://chromium-swarm.appspot.com -d pool "Chrome-perf" |grep build73-b1
build73-b1--device1
  {"android_devices": ["1"], "device_os": ["M", "MMB29Q"], "device_type": ["bullhead"], "id": ["build73-b1--device1"], "os": ["Android"], "pool": ["Chrome-perf"], "python": ["2.7.12"], "temp_band": ["<30"]}
build73-b1--device2
  {"android_devices": ["1"], "device_os": ["M", "MMB29Q"], "device_type": ["bullhead"], "id": ["build73-b1--device2"], "os": ["Android"], "pool": ["Chrome-perf"], "python": ["2.7.12"], "temp_band": ["<30"]}
build73-b1--device3
  {"android_devices": ["1"], "device_os": ["M", "MMB29Q"], "device_type": ["bullhead"], "id": ["build73-b1--device3"], "os": ["Android"], "pool": ["Chrome-perf"], "python": ["2.7.12"], "temp_band": ["<30"]}
build73-b1--device4
  {"android_devices": ["1"], "device_os": ["M", "MMB29Q"], "device_type": ["bullhead"], "id": ["build73-b1--device4"], "os": ["Android"], "pool": ["Chrome-perf"], "python": ["2.7.12"], "temp_band": ["<30"]}
build73-b1--device5
  {"android_devices": ["1"], "device_os": ["M", "MMB29Q"], "device_type": ["bullhead"], "id": ["build73-b1--device5"], "os": ["Android"], "pool": ["Chrome-perf"], "python": ["2.7.12"], "temp_band": ["<30"]}
build73-b1--device6
  {"android_devices": ["1"], "device_os": ["M", "MMB29Q"], "device_type": ["bullhead"], "id": ["build73-b1--device6"], "os": ["Android"], "pool": ["Chrome-perf"], "python": ["2.7.12"], "temp_band": ["<30"]}
build73-b1--device7
  {"android_devices": ["1"], "device_os": ["M", "MMB29Q"], "device_type": ["bullhead"], "id": ["build73-b1--device7"], "os": ["Android"], "pool": ["Chrome-perf"], "python": ["2.7.12"], "temp_band": ["<30"]}