How to create a dashboard cloudWatch that monitor the total number of ongoing instances of the specific step function

Question

I need to create a dashboard that shows the total number of ongoing instances of the specific step function. But the step function service supports only these fields related to the execution: `ExecutionThrottled, ExecutionsAborted, ExecutionsFailed, ExecutionsStarted, ExecutionsSucceeded, ExecutionsTimedOut`. (https://docs.aws.amazon.com/step-functions/latest/dg/procedure-cw-metrics.html)

I thought the ongoing executions is calculated like this

```
ExecutionsRunning = ExecutionsStarted - ExecutionsSucceeded - ExecutionsFailed - ExecutionsAborted - ExecutionsTimedOut
```
But it seems incorrect. Does anyone have other ideas? Thanks!

Accepted Answer

Hi, can you extend the code of those StepFunctions?
 If yes, 1 way to achieve your goal is to define your own CW metric. You do +1 to it when you start a new execution of your Step Function and -1 when execution terminates (either normally or not: timeout, failed, etc.)

How to create a dashboard cloudWatch that monitor the total number of ongoing instances of the specific step function

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