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August 4, 2019 11:58
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Publish AWS Step Function per-activity backlog as Cloudwatch metric
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public void metricPendingActivities() { | |
AWSStepFunctions client = AWSStepFunctionsClientBuilder.defaultClient(); | |
ListStateMachinesRequest lsmr = new ListStateMachinesRequest(); | |
//TODO: paging | |
ListStateMachinesResult machinesResult = client.listStateMachines(lsmr); | |
Map<String, Long> counts = machinesResult.getStateMachines() | |
.stream() | |
.map(m -> { | |
ListExecutionsRequest executionsReq = new ListExecutionsRequest() | |
.withMaxResults(100) | |
.withStateMachineArn(m.getStateMachineArn()) | |
.withStatusFilter(ExecutionStatus.RUNNING); | |
ListExecutionsResult res = client.listExecutions(executionsReq); | |
return res.getExecutions(); | |
}) | |
.flatMap(l -> l.stream()) | |
.map(e -> { | |
GetExecutionHistoryRequest req = new GetExecutionHistoryRequest() | |
.withExecutionArn(e.getExecutionArn()) | |
.withReverseOrder(true); | |
GetExecutionHistoryResult res = client.getExecutionHistory(req); | |
return res.getEvents(); | |
}) | |
.map(h -> h.get(0)) | |
.filter(h -> h.getActivityScheduledEventDetails() != null) | |
.map(h -> h.getActivityScheduledEventDetails()) | |
.collect(Collectors.groupingBy( | |
ActivityScheduledEventDetails::getResource, | |
Collectors.counting())); | |
ListActivitiesRequest actr = new ListActivitiesRequest(); | |
client.listActivities(actr).getActivities().forEach(a -> { | |
if(!counts.containsKey(a.getActivityArn())) | |
counts.put(a.getActivityArn(), 0L); | |
}); | |
AmazonCloudWatch cw = AmazonCloudWatchClientBuilder.defaultClient(); | |
counts.entrySet().forEach(e -> { | |
PutMetricDataRequest req = new PutMetricDataRequest() | |
.withNamespace("MyCompany/Custom") | |
.withMetricData(new MetricDatum() | |
.withMetricName("PendingTasks") | |
.withValue(e.getValue().doubleValue()) | |
.withDimensions(new Dimension() | |
.withName("ActivityArn") | |
.withValue(e.getKey()))); | |
cw.putMetricData(req); | |
}); | |
} |
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This won't work for machines with parallel branches however