the"err_lager_hwm" parameter only work when erlang process crash

[liuqing121]

In production,If I want to limit the error log or info log num,I must use the parameter "high_water_mark",otherwise ,the log num can not be limit. for emample,the right configuration is :
{lager,[
{handlers,[
{lager_file_backend, [{file, "error.log"}, {level, error}, {count, 5}, {size, 10485760},{high_water_mark,50},{flush_queue,true}]},
{lager_file_backend, [{file, "info.log"}, {level, info}, {count, 5}, {size, 10485760},{high_water_mark,50},{flush_queue,true}]}
]},
{error_logger_hwm,50}
]}
the wrong configuration is:
{lager,[
{handlers,[
{lager_file_backend, [{file, "error.log"}, {level, error}, {count, 5}, {size, 10485760},{flush_queue,true}]},
{lager_file_backend, [{file, "info.log"}, {level, info}, {count, 5}, {size, 10485760},{flush_queue,true}]}
]},
{error_logger_hwm,50}
]}