Simple Groupware has a built-in monitoring system which takes care of system problems. For example every time an (un)successful login occurs, an event is generated and displayed in the events module.
Also slow pages, slow queries, query errors or PHP errors are monitored. For better reconstructing errors, a stack trace is included in the details view.
If a quota is reached somewhere, this also results in a new event.

You can find all messages within the events module which is located at:
"Workspace / System / Events"

Note: A query is classified as a slow query if it takes more than 0.5 seconds. A slow page takes more than 2 seconds to come up.

All errors are written to "<sgs-dir>/simple_cache/debug/error.txt" first. Then the system writes the messages to the database and removes them from the text file. In case the database is not available, the messages remain in "error.txt". If the size of this file exceeds 2 MB, the system stops with the message "Can't process the error logfile, too large". Then, it is recommended to check the file manually and move it to another location in your system.