## Compat Logging

The Icinga 1.x log format is considered being the `Compat Log`
in Icinga 2 provided with the `CompatLogger` object.

These logs are not only used for informal representation in
external web interfaces parsing the logs, but also to generate
sla reports and trends in Icinga 1.x Classic UI.

The `CompatLogger` object can be enabled with

    # icinga2-enable-feature compatlog
    
By default, the Icinga 1.x log file called `icinga.log` is located
in `/var/log/icinga2/compat`. Rotated log files are moved into
`var/log/icinga2/compat/archives`.

The format cannot be changed without breaking compatibility to
existing log parsers.

    # tail -f /var/log/icinga2/compat/icinga.log

    [1382115688] LOG ROTATION: HOURLY
    [1382115688] LOG VERSION: 2.0
    [1382115688] HOST STATE: CURRENT;localhost;UP;HARD;1;
    [1382115688] SERVICE STATE: CURRENT;localhost;disk;WARNING;HARD;1;
    [1382115688] SERVICE STATE: CURRENT;localhost;http;OK;HARD;1;
    [1382115688] SERVICE STATE: CURRENT;localhost;load;OK;HARD;1;
    [1382115688] SERVICE STATE: CURRENT;localhost;ping4;OK;HARD;1;
    [1382115688] SERVICE STATE: CURRENT;localhost;ping6;OK;HARD;1;
    [1382115688] SERVICE STATE: CURRENT;localhost;processes;WARNING;HARD;1;
    [1382115688] SERVICE STATE: CURRENT;localhost;ssh;OK;HARD;1;
    [1382115688] SERVICE STATE: CURRENT;localhost;users;OK;HARD;1;
    [1382115706] EXTERNAL COMMAND: SCHEDULE_FORCED_SVC_CHECK;localhost;disk;1382115705
    [1382115706] EXTERNAL COMMAND: SCHEDULE_FORCED_SVC_CHECK;localhost;http;1382115705
    [1382115706] EXTERNAL COMMAND: SCHEDULE_FORCED_SVC_CHECK;localhost;load;1382115705
    [1382115706] EXTERNAL COMMAND: SCHEDULE_FORCED_SVC_CHECK;localhost;ping4;1382115705
    [1382115706] EXTERNAL COMMAND: SCHEDULE_FORCED_SVC_CHECK;localhost;ping6;1382115705
    [1382115706] EXTERNAL COMMAND: SCHEDULE_FORCED_SVC_CHECK;localhost;processes;1382115705
    [1382115706] EXTERNAL COMMAND: SCHEDULE_FORCED_SVC_CHECK;localhost;ssh;1382115705
    [1382115706] EXTERNAL COMMAND: SCHEDULE_FORCED_SVC_CHECK;localhost;users;1382115705
    [1382115731] EXTERNAL COMMAND: PROCESS_SERVICE_CHECK_RESULT;localhost;ping6;2;critical test|
    [1382115731] SERVICE ALERT: localhost;ping6;CRITICAL;SOFT;2;critical test