When trying to launch a tryjob, e.g. cros tryjob meowth-release-tryjob
it's failing (most of the time, 100%?) with the following error message:
Submitting tryjob...
08:27:15: ERROR: cros tryjob failed before completing.
08:27:15: ERROR: Got a 503 response from buildbucket with url: https://cr-buildbucket.appspot.com/_ah/api/buildbucket/v1/builds

followed with a long JSON stuff (see below) containing HTML containing some messaging about over-quota.

content: {
 "error": {
  "errors": [
   {
    "domain": "global",
    "reason": "backendError",
    "message": "\n\u003chtml\u003e\u003chead\u003e\n\u003cmeta http-equiv=\"content-type\" content=\"text/html;charset=utf-8\"\u003e\n\u003ctitle\u003e503 Over Quota\u003c/title\u003e\n\u003cstyle\u003e\u003c!--\nbody {font-family: arial,sans-serif}\ndiv.nav {margin-top: 1ex}\ndiv.nav A {font-size: 10pt; font-family: arial,sans-serif}\nspan.nav {font-size: 10pt; font-family: arial,sans-serif; font-weight: bold}\ndiv.nav A,span.big {font-size: 12pt; color: #0000cc}\ndiv.nav A {font-size: 10pt; color: black}\nA.l:link {color: #6f6f6f}\nA.u:link {color: green}\n//--\u003e\u003c/style\u003e\n\n\u003c/head\u003e\n\u003cbody text=#000000 bgcolor=#ffffff\u003e\n\u003ctable border=0 cellpadding=2 cellspacing=0 width=100%\u003e\n\u003ctr\u003e\u003ctd bgcolor=#3366cc\u003e\u003cfont face=arial,sans-serif color=#ffffff\u003e\u003cb\u003eError\u003c/b\u003e\u003c/td\u003e\u003c/tr\u003e\n\u003ctr\u003e\u003ctd\u003e \u003c/td\u003e\u003c/tr\u003e\u003c/table\u003e\n\u003cblockquote\u003e\n\u003cH1\u003eOver Quota\u003c/H1\u003e\nThis application is temporarily over its serving quota.  Please try again later.\n\n\u003cp\u003e\n\u003c/blockquote\u003e\n\u003ctable width=100% cellpadding=0 cellspacing=0\u003e\u003ctr\u003e\u003ctd bgcolor=#3366cc\u003e\u003cimg alt=\"\" width=1 height=4\u003e\u003c/td\u003e\u003c/tr\u003e\u003c/table\u003e\n\u003c/body\u003e\u003c/html\u003e\n",
    "debugInfo": "Lily SPI request failed: status=503 URL='https://13708-4184003-dot-cr-buildbucket.appspot.com/_ah/spi/BuildBucketApi.put' error='\n\u003chtml\u003e\u003chead\u003e\n\u003cmeta http-equiv=\"content-type\" content=\"text/html;charset=utf-8\"\u003e\n\u003ctitle\u003e503 Over Quota\u003c/title\u003e\n\u003cstyle\u003e\u003c!--\nbody {font-family: arial,sans-serif}\ndiv.nav {margin-top: 1ex}\ndiv.nav A {font-size: 10pt; font-family: arial,sans-serif}\nspan.nav {font-size: 10pt; font-family: arial,sans-serif; font-weight: bold}\ndiv.nav A,span.big {font-size: 12pt; color: #0000cc}\ndiv.nav A {font-size: 10pt; color: black}\nA.l:link {color: #6f6f6f}\nA.u:link {color: green}\n//--\u003e\u003c/style\u003e\n\n\u003c/head\u003e\n\u003cbody text=#000000 bgcolor=#ffffff\u003e\n\u003ctable border=0 cellpadding=2 cellspacing=0 width=100%\u003e\n\u003ctr\u003e\u003ctd bgcolor=#3366cc\u003e\u003cfont face=arial,sans-serif color=#ffffff\u003e\u003cb\u003eError\u003c/b\u003e\u003c/td\u003e\u003c/tr\u003e\n\u003ctr\u003e\u003ctd\u003e \u003c/td\u003e\u003c/tr\u003e\u003c/table\u003e\n\u003cblockquote\u003e\n\u003cH1\u003eOver Quota\u003c/H1\u003e\nThis application is temporarily over its serving quota.  Please try again later.\n\n\u003cp\u003e\n\u003c/blockquote\u003e\n\u003ctable width=100% cellpadding=0 cellspacing=0\u003e\u003ctr\u003e\u003ctd bgcolor=#3366cc\u003e\u003cimg alt=\"\" width=1 height=4\u003e\u003c/td\u003e\u003c/tr\u003e\u003c/table\u003e\n\u003c/body\u003e\u003c/html\u003e\n'\ncom.google.api.server.core.Fault: ImmutableErrorDefinition{base=BACKEND_ERROR, category=BACKEND_ERROR, cause=null, debugInfo=Lily SPI request failed: status=503 URL='https://13708-4184003-dot-cr-buildbucket.appspot.com/_ah/spi/BuildBucketApi.put' error='\n\u003chtml\u003e\u003chead\u003e\n\u003cmeta http-equiv=\"content-type\" content=\"text/html;charset=utf-8\"\u003e\n\u003ctitle\u003e503 Over Quota\u003c/title\u003e\n\u003cstyle\u003e\u003c!--\nbody {font-family: arial,sans-serif}\ndiv.nav {margin-top: 1ex}\ndiv.nav A {font-size: 10pt; font-family: arial,sans-serif}\nspan.nav {font-size: 10pt; font-family: arial,sans-serif; font-weight: bold}\ndiv.nav A,span.big {font-size: 12pt; color: #0000cc}\ndiv.nav A {font-size: 10pt; color: black}\nA.l:link {color: #6f6f6f}\nA.u:link {color: green}\n//--\u003e\u003c/style\u003e\n\n\u003c/head\u003e\n\u003cbody text=#000000 bgcolor=#ffffff\u003e\n\u003ctable border=0 cellpadding=2 cellspacing=0 width=100%\u003e\n\u003ctr\u003e\u003ctd bgcolor=#3366cc\u003e\u003cfont face=arial,sans-serif color=#ffffff\u003e\u003cb\u003eError\u003c/b\u003e\u003c/td\u003e\u003c/tr\u003e\n\u003ctr\u003e\u003ctd\u003e \u003c/td\u003e\u003c/tr\u003e\u003c/table\u003e\n\u003cblockquote\u003e\n\u003cH1\u003eOver Quota\u003c/H1\u003e\nThis application is temporarily over its serving quota.  Please try again later.\n\n\u003cp\u003e\n\u003c/blockquote\u003e\n\u003ctable width=100% cellpadding=0 cellspacing=0\u003e\u003ctr\u003e\u003ctd bgcolor=#3366cc\u003e\u003cimg alt=\"\" width=1 height=4\u003e\u003c/td\u003e\u003c/tr\u003e\u003c/table\u003e\n\u003c/body\u003e\u003c/html\u003e\n', domain=global, extendedHelp=null, httpHeaders={}, httpStatus=serviceUnavailable, internalReason=Reason{arguments={}, cause=null, code=lilySpiBackendError, createdByBackend=false, debugMessage=null, errorProtoCode=null, errorProtoDomain=null, filteredMessage=null, location=null, message=null, unnamedArguments=[]}, location=null, message=\n\u003chtml\u003e\u003chead\u003e\n\u003cmeta http-equiv=\"content-type\" content=\"text/html;charset=utf-8\"\u003e\n\u003ctitle\u003e503 Over Quota\u003c/title\u003e\n\u003cstyle\u003e\u003c!--\nbody {font-family: arial,sans-serif}\ndiv.nav {margin-top: 1ex}\ndiv.nav A {font-size: 10pt; font-family: arial,sans-serif}\nspan.nav {font-size: 10pt; font-family: arial,sans-serif; font-weight: bold}\ndiv.nav A,span.big {font-size: 12pt; color: #0000cc}\ndiv.nav A {font-size: 10pt; color: black}\nA.l:link {color: #6f6f6f}\nA.u:link {color: green}\n//--\u003e\u003c/style\u003e\n\n\u003c/head\u003e\n\u003cbody text=#000000 bgcolor=#ffffff\u003e\n\u003ctable border=0 cellpadding=2 cellspacing=0 width=100%\u003e\n\u003ctr\u003e\u003ctd bgcolor=#3366cc\u003e\u003cfont face=arial,sans-serif color=#ffffff\u003e\u003cb\u003eError\u003c/b\u003e\u003c/td\u003e\u003c/tr\u003e\n\u003ctr\u003e\u003ctd\u003e \u003c/td\u003e\u003c/tr\u003e\u003c/table\u003e\n\u003cblockquote\u003e\n\u003cH1\u003eOver Quota\u003c/H1\u003e\nThis application is temporarily over its serving quota.  Please try again later.\n\n\u003cp\u003e\n\u003c/blockquote\u003e\n\u003ctable width=100% cellpadding=0 cellspacing=0\u003e\u003ctr\u003e\u003ctd bgcolor=#3366cc\u003e\u003cimg alt=\"\" width=1 height=4\u003e\u003c/td\u003e\u003c/tr\u003e\u003c/table\u003e\n\u003c/body\u003e\u003c/html\u003e\n, reason=backendError, rpcCode=-32099} \n\u003chtml\u003e\u003chead\u003e\n\u003cmeta http-equiv=\"content-type\" content=\"text/html;charset=utf-8\"\u003e\n\u003ctitle\u003e503 Over Quota\u003c/title\u003e\n\u003cstyle\u003e\u003c!--\nbody {font-family: arial,sans-serif}\ndiv.nav {margin-top: 1ex}\ndiv.nav A {font-size: 10pt; font-family: arial,sans-serif}\nspan.nav {font-size: 10pt; font-family: arial,sans-serif; font-weight: bold}\ndiv.nav A,span.big {font-size: 12pt; color: #0000cc}\ndiv.nav A {font-size: 10pt; color: black}\nA.l:link {color: #6f6f6f}\nA.u:link {color: green}\n//--\u003e\u003c/style\u003e\n\n\u003c/head\u003e\n\u003cbody text=#000000 bgcolor=#ffffff\u003e\n\u003ctable border=0 cellpadding=2 cellspacing=0 width=100%\u003e\n\u003ctr\u003e\u003ctd bgcolor=#3366cc\u003e\u003cfont face=arial,sans-serif color=#ffffff\u003e\u003cb\u003eError\u003c/b\u003e\u003c/td\u003e\u003c/tr\u003e\n\u003ctr\u003e\u003ctd\u003e \u003c/td\u003e\u003c/tr\u003e\u003c/table\u003e\n\u003cblockquote\u003e\n\u003cH1\u003eOver Quota\u003c/H1\u003e\nThis application is temporarily over its serving quota.  Please try again later.\n\n\u003cp\u003e\n\u003c/blockquote\u003e\n\u003ctable width=100% cellpadding=0 cellspacing=0\u003e\u003ctr\u003e\u003ctd bgcolor=#3366cc\u003e\u003cimg alt=\"\" width=1 height=4\u003e\u003c/td\u003e\u003c/tr\u003e\u003c/table\u003e\n\u003c/body\u003e\u003c/html\u003e\n: Lily SPI request failed: status=503 URL='https://13708-4184003-dot-cr-buildbucket.appspot.com/_ah/spi/BuildBucketApi.put' error='\n\u003chtml\u003e\u003chead\u003e\n\u003cmeta http-equiv=\"content-type\" content=\"text/html;charset=utf-8\"\u003e\n\u003ctitle\u003e503 Over Quota\u003c/title\u003e\n\u003cstyle\u003e\u003c!--\nbody {font-family: arial,sans-serif}\ndiv.nav {margin-top: 1ex}\ndiv.nav A {font-size: 10pt; font-family: arial,sans-serif}\nspan.nav {font-size: 10pt; font-family: arial,sans-serif; font-weight: bold}\ndiv.nav A,span.big {font-size: 12pt; color: #0000cc}\ndiv.nav A {font-size: 10pt; color: black}\nA.l:link {color: #6f6f6f}\nA.u:link {color: green}\n//--\u003e\u003c/style\u003e\n\n\u003c/head\u003e\n\u003cbody text=#000000 bgcolor=#ffffff\u003e\n\u003ctable border=0 cellpadding=2 cellspacing=0 width=100%\u003e\n\u003ctr\u003e\u003ctd bgcolor=#3366cc\u003e\u003cfont face=arial,sans-serif color=#ffffff\u003e\u003cb\u003eError\u003c/b\u003e\u003c/td\u003e\u003c/tr\u003e\n\u003ctr\u003e\u003ctd\u003e \u003c/td\u003e\u003c/tr\u003e\u003c/table\u003e\n\u003cblockquote\u003e\n\u003cH1\u003eOver Quota\u003c/H1\u003e\nThis application is temporarily over its serving quota.  Please try again later.\n\n\u003cp\u003e\n\u003c/blockquote\u003e\n\u003ctable width=100% cellpadding=0 cellspacing=0\u003e\u003ctr\u003e\u003ctd bgcolor=#3366cc\u003e\u003cimg alt=\"\" width=1 height=4\u003e\u003c/td\u003e\u003c/tr\u003e\u003c/table\u003e\n\u003c/body\u003e\u003c/html\u003e\n'\n\tat com.google.api.server.rest.adapter.lily.LilyErrorConverter.createFault(LilyErrorConverter.java:117)\n\tat com.google.api.server.rest.adapter.lily.LilyHandler$Transformer.apply(LilyHandler.java:211)\n\tat com.google.api.server.rest.adapter.lily.LilyHandler$Transformer.apply(LilyHandler.java:175)\n\tat com.google.common.util.concurrent.AbstractTransformFuture$TransformFuture.doTransform(AbstractTransformFuture.java:241)\n\tat com.google.common.util.concurrent.AbstractTransformFuture$TransformFuture.doTransform(AbstractTransformFuture.java:231)\n\tat com.google.common.util.concurrent.AbstractTransformFuture.run(AbstractTransformFuture.java:122)\n\tat com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:401)\n\tat com.google.common.util.concurrent.AbstractFuture.executeListener(AbstractFuture.java:1019)\n\tat com.google.common.util.concurrent.AbstractFuture.addListener(AbstractFuture.java:675)\n\tat com.google.common.util.concurrent.AbstractFuture$TrustedFuture.addListener(AbstractFuture.java:107)\n\tat com.google.common.util.concurrent.AbstractTransformFuture.create(AbstractTransformFuture.java:51)\n\tat com.google.common.util.concurrent.Futures.transform(Futures.java:761)\n\tat com.google.api.server.rest.adapter.lily.LilyHandler$LilyCallHandler$1.callInContext(LilyHandler.java:404)\n\tat com.google.api.server.rest.adapter.lily.LilyHandler$LilyCallHandler$1.callInContext(LilyHandler.java:370)\n\tat com.google.tracing.TraceContext$TraceContextCallable$1.call(TraceContext.java:793)\n\tat com.google.tracing.TraceContext$AbstractTraceContextCallback.callInInheritedContextNoUnref(TraceContext.java:339)\n\tat com.google.tracing.TraceContext$AbstractTraceContextCallback.callInInheritedContext(TraceContext.java:328)\n\tat com.google.tracing.TraceContext$TraceContextCallable.call(TraceContext.java:790)\n\tat com.google.common.util.concurrent.TrustedListenableFutureTask$TrustedFutureInterruptibleTask.runInterruptibly(TrustedListenableFutureTask.java:130)\n\tat com.google.common.util.concurrent.InterruptibleTask.run(InterruptibleTask.java:57)\n\tat com.google.common.util.concurrent.TrustedListenableFutureTask.run(TrustedListenableFutureTask.java:83)\n\tat com.google.api.server.thread.ThreadTrackers$ThreadTrackingRunnable.run(ThreadTrackers.java:126)\n\tat com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:454)\n\tat com.google.api.server.server.CommonModule$ContextCarryingExecutorService$1.runInContext(CommonModule.java:846)\n\tat com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:461)\n\tat com.google.tracing.CurrentContext.runInContext(CurrentContext.java:351)\n\tat com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:320)\n\tat com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:312)\n\tat com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:458)\n\tat java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)\n\tat java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)\n\tat java.lang.Thread.run(Thread.java:745)\n"
   }
  ],
  "code": 503,
  "message": "\n\u003chtml\u003e\u003chead\u003e\n\u003cmeta http-equiv=\"content-type\" content=\"text/html;charset=utf-8\"\u003e\n\u003ctitle\u003e503 Over Quota\u003c/title\u003e\n\u003cstyle\u003e\u003c!--\nbody {font-family: arial,sans-serif}\ndiv.nav {margin-top: 1ex}\ndiv.nav A {font-size: 10pt; font-family: arial,sans-serif}\nspan.nav {font-size: 10pt; font-family: arial,sans-serif; font-weight: bold}\ndiv.nav A,span.big {font-size: 12pt; color: #0000cc}\ndiv.nav A {font-size: 10pt; color: black}\nA.l:link {color: #6f6f6f}\nA.u:link {color: green}\n//--\u003e\u003c/style\u003e\n\n\u003c/head\u003e\n\u003cbody text=#000000 bgcolor=#ffffff\u003e\n\u003ctable border=0 cellpadding=2 cellspacing=0 width=100%\u003e\n\u003ctr\u003e\u003ctd bgcolor=#3366cc\u003e\u003cfont face=arial,sans-serif color=#ffffff\u003e\u003cb\u003eError\u003c/b\u003e\u003c/td\u003e\u003c/tr\u003e\n\u003ctr\u003e\u003ctd\u003e \u003c/td\u003e\u003c/tr\u003e\u003c/table\u003e\n\u003cblockquote\u003e\n\u003cH1\u003eOver Quota\u003c/H1\u003e\nThis application is temporarily over its serving quota.  Please try again later.\n\n\u003cp\u003e\n\u003c/blockquote\u003e\n\u003ctable width=100% cellpadding=0 cellspacing=0\u003e\u003ctr\u003e\u003ctd bgcolor=#3366cc\u003e\u003cimg alt=\"\" width=1 height=4\u003e\u003c/td\u003e\u003c/tr\u003e\u003c/table\u003e\n\u003c/body\u003e\u003c/html\u003e\n"
 }
}