Jira and Bitbucket Server integration work by looking through your commit logs for comments that start with or contain any issue keys. See the following screenshot:
![](http://images-20200215.ebookreading.net/4/3/3/9781838558123/9781838558123__jira-8-administration__9781838558123__assets__59b5c9da-63b9-44e4-99df-b21a05c83d15.png)
If the commit comment contains an issue key, the commits will be displayed in the Development issue panel of the issue.