In reply to Leonid Batkhan.

Thanks Leonid, also for your feedback below on HTML comment workarounds, I thought that it would interpret comments 'as-is' and not as HTML but you learn something new every day. :-)
Using the OK or ERROR before the .log is useful as it preserves the 'log' type. Because the timestamp I use is always numeric e.g. 20200821 (for 21aug21), it sorts in runtime order, then program order, so it's easier to see progress of large batches, but the reverse as you point out allows sorting by program name.