The logs ticker can display Markdown formatted logs such as bold, italics, links, and code blocks. DISPLAY RAW disables markdown rendering.
Sequence begin/complete logs do just what it sounds like: sends a log indicating the start and end of a sequence. Sequence step logs will send logs for sequences steps that may not otherwise generate a log. That feature was implemented probably 8 years ago though and there may be discrepancies in how it is applied across all steps.