It probably means that your log file is about to autogrow, or that it will need to be grown.
It probably also means that log backups aren't being done the way they should.
It might mean the database is in the wrong recovery mode.
It literally means that 90% of the allocated space for the log file is in use and only 10% remains for new transactions. What you need to do about that depends on what the database is for, how it's used, and what expectations are for growth and use in the future.
- Gus "GSquared", RSVP, OODA, MAP, NMVP, FAQ, SAT, SQL, DNA, RNA, UOI, IOU, AM, PM, AD, BC, BCE, USA, UN, CF, ROFL, LOL, ETC
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