[
   {eRum, [

        %% 是否开启颜色
        {colored, false},
        %% 颜色码配置
        {colors, [
           {debug, "\e[0;38m"},
           {info, "\e[1;37m"},
           {notice, "\e[1;36m"},
           {warning, "\e[1;33m"},
           {error, "\e[1;31m"},
           {critical, "\e[1;35m"},
           {alert, "\e[1;44m"},
           {emergency, "\e[1;41m"}
        ]},

        %% crash log cfg
        %% 有效值 string | false
        %% 为 false 的时候 没有 crash logger.
        {crash_log, "log/crash.log"},

        %% Maximum size in bytes of events in the crash log - defaults to 65536
        {crash_log_msg_size, 65536},

        %% Maximum size of the crash log in bytes, before its rotated, set to 0 to disable rotation - default is 0
        {crash_log_size, 10485760},

        %% What time to rotate the crash log - default is no time rotation. See the README for a description of this format.
        {crash_log_date, "$D0"},

        %% Number of rotated crash logs to keep, 0 means keep only the current one - default is 0
        {crash_log_count, 5},

        %% Crash Log Rotator Module - default is lager_rotator_default
        {crash_log_rotator, lager_rotator_default},

        %% Whether to redirect error_logger messages into the default lager_event sink - defaults to true
        {error_logger_redirect, true},

        %% How many messages per second to allow from error_logger before we start dropping them
        {error_logger_hwm, 50},

        %% How big the gen_event mailbox can get before it is
        %% switched into sync mode.  This value only applies to
        %% the default sink; extra sinks can supply their own.
        {async_threshold, 20},

        %% Switch back to async mode, when gen_event mailbox size
        %% decrease from `async_threshold' to async_threshold -
        %% async_threshold_window. This value only applies to the
        %% default sink; extra sinks can supply their own.
        {async_threshold_window, 5}
   ]}
].