Changelog: 2026-07-17

New #

Added support for new HTTP uptime assertions:

Header does not exist

Header does not contain (now also passes when the header is absent)

Improvements #

Redesigned the Oh Dear homepage and made significant performance improvements across the marketing site.

Improved the monthly uptime report email with a refreshed design and clearer presentation.

Security #

Strengthened SSRF protections by preventing monitors from being created with private or reserved IP addresses.

Extended SSRF validation to redirects, crawler requests, and sitemap fetches.

Fixes #

Fixed a server error when a scheduled task had no timezone configured by falling back to UTC.

Fixed cross-tenant write and delete operations on shared resources.

Fixed API validation to handle invalid monitor types gracefully.

Fixed Slack "Check again" actions that could leave downtime alerts stuck in a running state.