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Oh Dear

Changelog for July 17th, 2026

New HTTP uptime header assertions, redesigned homepage, stronger SSRF protection, and improved uptime reports

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.

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