This is a question for your DBAs, it's nothing to do with Jira.
The .mdf is easiest to think of as the current database, the .ldf is a record of activity.
Jira doesn't care what the database is doing in the background, it's irrelevant to it, it simply needs a database to use as a store. Technically, you could just dump the .ldf completely, and Jira wouldn't notice.
A permanently growing .ldf file suggests someone has not thought about backups of the database yet, and it's something you should have a proper look at soon.
https://www.papercut.com/kb/Main/LogFileSizeOnSqlServer is a nice explanation, good enough to get me started when I first ran into this.
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