Max session/load warnings

The POPular servers will log warnings when certain load and session limits are reached.

The session and load limit can be configured through the maxsession and maxlocalload config variables. Both are integers.

When 90% of the session or load limit is reached, POPular will switch from state 'OK' to state 'WARN', when 100% of the session or load limit is reached, POPular will switch to state 'MAX'. When the session count or load falls below 90% in state 'MAX', it will go to state 'WARN'. When the session count or load falls below 80% in state 'WARN', it will go to state 'OK'.

Each change of state is logged. For session state changes a message number 0x0170 ('session_state') is logged, for load state changes a message number 0x0172 ('load_state') is logged. The message contains the name of the new state.

As long as there are session slots available, new connections will be accepted regardless of the session state.

If the load state is 'MAX', no new connections will be accepted until the state drops back to 'WARN'.