Some apps have a history log which records what each user or team does throughout the time they use the app.
Does Jira have such a log file, and if yes can I access it using the REST API?
Yes, you can access by adding expand=changelog to your rest query.
/rest/api/2/issue/HT-10?expand=changelog
There is not standard rest API in Jira for activies/log but Jira provide stream API as a part of developer sdk for it.
You can find documentation related to this here - https://developer.atlassian.com/server/framework/atlassian-sdk/adding-activities-to-a-third-party-feed-with-the-rest-api/
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