The 2026-05-02 change that added the Brevo defensive-unblock step
to the email-roundtrip-monitor cron contained an apostrophe in a
Python comment ("wasn't"). The whole script is wrapped in shell
single quotes (python3 -c '...'), so the apostrophe terminated
the shell string. Python only parsed up to the apostrophe and
raised IndentationError on the now-bodyless try: block; everything
after was handed to /bin/sh which complained about "try::" and
unmatched parens. Result: every probe run since 2026-05-02 00:41 UTC
crashed before it could push, and the "Email Roundtrip E2E" Uptime
Kuma push monitor went DOWN with "No heartbeat in the time window".
Fix: rewrite the comment without an apostrophe and add a banner
warning so the next person editing this heredoc does not regress.
Validated: shell parses (bash -n), Python compiles (py_compile)
with the wrapping single quotes intact.
6e77d1870e