Given a number of application logs sharing the same HeaderLine and EndLine regular expressions we are trying out a xm_multiline with im_file config using wild cards. 

<Extension multi>
  Module      xm_multiline
    HeaderLine /^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2},\d{3} @ batch_task\._init_logger : \[INFO\]\+ /
    EndLine /^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2},\d{3} @ run_batch\.<module> : \[INFO\]- /
</Extension>

<Input inPython>
    Module    im_file
    File "C:\\data\\server1\\*.log"
    InputType multi
    Exec $FileName = file_name();
</Input>

It works consistently without wildcards pointed at one file.
It works intermittently with wildcards pointed at multiple files being written to concurrenlty.

I'm wondering if this is a supported use case. i.e. multiline events from wildcarded files being written to concurrenlty. Or should we be specifiying each input file individually?

thanks,

Rob