The way this would be done natively within JIRA would be via a Postfunction, however, there is not a post function in JIRA to add a watcher or update that particular field. In light of this you would need to use an add-on like ScriptRunner or Bob Swift's Update on Transition for JIRA.
Hey Atlassian community, I help lead engineering at Sentry, an open-source error-tracking and monitoring tool that integrates with Jira. We started using Jira Software Cloud internally last year, a...
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