content.html stripped for large events

Hi, I've been debugging an issue today where our alerts (generic webhook) simply contained our "plain" fallback which is intended for clients that do not render HTML. If we replace the "plain" content with more about our alerts, we will just lose the html rendering sooner.

Turns out, it is because the html is stripped when the event size limit is exceeded.

Some short-term solutions:

• Warning in the log (not great for end users).
• Replace "html" with an error message if we have the event size budget. Otherwise, log the error.
• Replace "html" and "plain" with an error message.

Only long term solution I can think of is if the transformation scripts API supported multiple events per call.

If you let me know you are happy with any of the short-term solutions, I'll submit the PR.

Thanks for hookshot 👍

Start with src/Connections/GenericHook.ts around line 699 and review the Matrix event size limits linked in the issue. First confirm which short-term behavior maintainers want, since the issue lists several alternatives without a decision. Done should mean oversized events no longer silently lose their HTML content, with the selected fallback or logging behavior verified.