## <a id="compat-logging"></a> 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 informational representation in
external web interfaces parsing the logs, but also to generate
SLA reports and trends in Icinga 1.x Classic UI. Futhermore the
`Livestatus` feature uses these logs for answering queries to
historical tables.

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