How can I verify if the high number of API calls originate from the SFJC connector?
The API calls number has gone up significantly and you want to verify if the API calls are related to the Salesforce JIRA connector application.
In Salesforce, check who is the integration user that the connector is using to access Salesforce from Jira.
Go to Setup > Connected Apps OAuth Usage > User Count and click on the number.
This will take you to the Connected Apps User's Usage page and show you the user.
Perform the following report on Salesforce Classic to list all the users with the total number of API calls:
If a dedicated Salesforce user is used as an integration user, you can verify by observing the call count in the report.