Compress Rotated Logs

/srv/lab/logs/pulse holds the active log pulse.log and older rotated copies named pulse.log.1, pulse.log.2 and so on. They take most of the disk.

Task

• Compress every rotated copy with gzip, so pulse.log.N becomes pulse.log.N.gz. No uncompressed rotated copies remain.
• The compressed files must contain exactly the original data.
• Do not touch the active pulse.log (the service still writes to it), nor the copies that are already compressed.