What changed in Healthchecks from 3 to 4

Important: this Healthchecks release is using Django 6.1, which has dropped support for PostgreSQL < 15, MySQL < 8.4, MariaDB < 10.11.

Improvements

• Send flapping notices to all team members (not just the owner)
• Upgrade to Django 6.1

Bug Fixes

• Fix the email integration to sanitize long lines in .eml attachments
• Fix race conditions when concurrent requests update the same check
• Fix bounce signing code to produce shorter signatures
• Security: fix the email verification link to depend on the email address

Improvements

• Send "Monthly Phone/SMS/WA Limit Reached" notice to all team members (not just owner)
• Include notification text in the "Monthly Phone/SMS/WA Limit Reached" notice
• Add a note about unset ping key in the check details page (#1295)
• In the "Add Gotify" form, let users specify alert priorities (#990, @BeyondMagic)
• Add ability to edit existing Gotify integrations
• Switch from Selectize to Tom Select for dropdown controls
• Implement Markdown formatting in Ntfy notifications
• Update alert templates to report downtime duration (#1309)
• Switch to Argon2 as the default hasher for passwords and login tokens
• Optimize DB queries for team membership lookups and for the "Get Pings" API call

Bug Fixes

• Fix WebhookValidator to handle input that contains square brackets
• Update Check.rename_and_delete() to better handle race conditions
• Enforce check limit (times two) when pinging by slug
• Fix the "Edit Ntfy" form to preserve selected priorities when the form reloads
• Fix the parsing of inbound emails with UTF8 body (#1311)
• Add rate-limiting by email in the /accounts/signup view

Improvements

• Update the email alert template to cut the beginning of the last ping body (#939)
• Update the email integration to attach email pings as .eml attachments

Bug Fixes

• Fix the email integration to handle deep attachment stacks in last ping body
• Fix check name and tag escaping in the Shell integration

Bug Fixes

• Fix sendalerts to avoid crashing on a timed out db connection (#1267)
• Fix the update_timeout view to also kick off nags

Improvements

• Remove team size limits: users on all plans can now invite many team members
• Add a one-line summary at the top of monthly/weekly/daily reports

Bug Fixes

• Fix a formatting issue in Matrix notification template (#1264, @neoscaler)
• Fix emails to never use non-breaking spaces in plain text emails
• Fix the "Change Email" form to warn the user about TOTP 2FA
• Fix daily reports to show downtime stats for the previous 2 days (not months)
• Fix incorrect Bearer token handling in the Prometheus metrics endpoint
• Fix the "Clone" function to copy the filter_http_body, filter_default_fail fields
• Fix the ping handler to reject uppercase letters in slug values (#1271)

This release drops support of Python 3.11 and below. The minimum required Python version is 3.12.

Improvements

• Upgrade to Django 6.0
• Update the Matrix integration to use Matrix v3 API (#1244)
• Update email alert template to use user's preferred time zone (#1230)
• Update the web UI to use user's preferred timezone instead of browser's timezone
• Add data migration to update legacy timezones to current canonical timezones (#1250)
• Switch to using multicolor icon font for integration icons

Bug Fixes

• Fix the text version of email report for recently created checks (#1236, @adelton)
• Fix prepare_durations() to assert ping ordering by id not by created date
• Fix the "Pause" API call and UI action to no-op if the check is already paused