Thank you, thank you, thank you! Here was my command for our MSDB log file going out of control. After determining that our Simple recovery model database was acting like a full rcovery db:

SELECT name, log_reuse_wait_desc FROM sys.databases

log_reuse_wait_desc = Replication

I forced removal of the replication (must have been caused during a restore at some point).

EXEC sp_removedbreplication msdb

Reran the following:

SELECT name, log_reuse_wait_desc FROM sys.databases

Forced to Simple Recovery (just to make sure):

ALTER DATABASE msdb SET RECOVERY SIMPLE

Ran standard shrink commands (found all over google or our favorite search engine 😉 )

backup log msdb with truncate_only

dbcc shrinkfile(MSDBLog)

Chicka chicka boom boom...now there's enough room!