Logging options
Tracking |  | Logs at creation, invocation begin and end.
Timing |  | Logs after each single activity execution (ie, not after activities defining a group_method_id) its execution time.
Tracing options
Creation tracing |  | Controls wether activities should contain a stack trace from their creation. It helps finding out where an activity comes from. Those traces are logged and mailed when an activity fails (as part of regular activity failure mails).

Activities Maintenance
Recreate activity tables, preserving existing messages. |
Recreate activity tables, throwing away all contained messages. |