# Healthchecks: what changed from 3 to 4

- Product: Healthchecks (https://whatsnew.fyi/product/healthchecks)
- Vendor: Pēteris Caune
- Range: changelog entries numbered after v3.13 up to and including v4.4, stable releases only
- Entries below: 6 releases (newest first)
- Resolved: 3 is v3.13 and 4 is v4.4, the newest stable release of each major we track
- Carrying security changes: 1 · CVEs mentioned: 0 · Mentioning breaking changes: 0 · Removing or deprecating something: 2
- Page: https://whatsnew.fyi/product/healthchecks/compare/3...4

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

## What changed (47 changes, grouped by kind)

### Added

#### v4.3 (2026-07-14)

- Add a note about unset ping key in the check details page
- Let users specify alert priorities in the "Add Gotify" form
- Add ability to edit existing Gotify integrations
- Implement Markdown formatting in Ntfy notifications
- Add rate-limiting by email in the /accounts/signup view

#### v4.1 (2026-03-20)

- Add a one-line summary at the top of monthly/weekly/daily reports

#### v4.0 (2026-01-22)

- Add data migration to update legacy timezones to current canonical timezones

### Changed

#### v4.4 (2026-08-31)

- Send flapping notices to all team members instead of just the owner
- Upgrade to Django 6.1

#### v4.3 (2026-07-14)

- Send "Monthly Phone/SMS/WA Limit Reached" notice to all team members instead of just owner
- Include notification text in the "Monthly Phone/SMS/WA Limit Reached" notice
- Switch from Selectize to Tom Select for dropdown controls
- Update alert templates to report downtime duration
- 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

#### v4.2 (2026-04-28)

- Update the email alert template to cut the beginning of the last ping body
- Update the email integration to attach email pings as .eml attachments

#### v4.0 (2026-01-22)

- Upgrade to Django 6.0
- Update the Matrix integration to use Matrix v3 API
- Update email alert template to use user's preferred time zone
- Update the web UI to use user's preferred timezone instead of browser's timezone
- Switch to using multicolor icon font for integration icons

### Fixed

#### v4.4 (2026-08-31)

- 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

#### v4.3 (2026-07-14)

- 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

#### v4.2 (2026-04-28)

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

#### v4.1.1 (2026-03-25)

- Fix sendalerts to avoid crashing on a timed out db connection
- Fix the update_timeout view to also kick off nags

#### v4.1 (2026-03-20)

- Fix a formatting issue in Matrix notification template
- 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 instead of months
- Fix incorrect Bearer token handling in the Prometheus metrics endpoint
- Fix the Clone function to copy the filter_http_body and filter_default_fail fields
- Fix the ping handler to reject uppercase letters in slug values

#### v4.0 (2026-01-22)

- Fix the text version of email report for recently created checks
- 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

### Removed

#### v4.1 (2026-03-20)

- Remove team size limits so users on all plans can now invite many team members

#### v4.0 (2026-01-22)

- Drop support for Python 3.11 and below; minimum required Python version is now 3.12

### Security

#### v4.4 (2026-08-31)

- Fix the email verification link to depend on the email address

## Release notes

### v4.4

- Date: 2026-08-31
- Version: v4.4
- Original notes: https://github.com/healthchecks/healthchecks/releases/tag/v4.4
- Permalink: https://whatsnew.fyi/product/healthchecks/releases/v4.4

- **changed** — Send flapping notices to all team members instead of just the owner
- **changed** — Upgrade to Django 6.1
- **fixed** — Fix the email integration to sanitize long lines in .eml attachments
- **fixed** — Fix race conditions when concurrent requests update the same check
- **fixed** — Fix bounce signing code to produce shorter signatures
- **security** — Fix the email verification link to depend on the email address

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

### v4.3

- Date: 2026-07-14
- Version: v4.3
- Original notes: https://github.com/healthchecks/healthchecks/releases/tag/v4.3
- Permalink: https://whatsnew.fyi/product/healthchecks/releases/v4.3

- **changed** — Send "Monthly Phone/SMS/WA Limit Reached" notice to all team members instead of just owner
- **changed** — Include notification text in the "Monthly Phone/SMS/WA Limit Reached" notice
- **added** — Add a note about unset ping key in the check details page
- **added** — Let users specify alert priorities in the "Add Gotify" form
- **added** — Add ability to edit existing Gotify integrations
- **changed** — Switch from Selectize to Tom Select for dropdown controls
- **added** — Implement Markdown formatting in Ntfy notifications
- **changed** — Update alert templates to report downtime duration
- **changed** — Switch to Argon2 as the default hasher for passwords and login tokens
- **changed** — Optimize DB queries for team membership lookups and for the "Get Pings" API call
- **fixed** — Fix WebhookValidator to handle input that contains square brackets
- **fixed** — Update Check.rename_and_delete() to better handle race conditions
- **fixed** — Enforce check limit (times two) when pinging by slug
- **fixed** — Fix the "Edit Ntfy" form to preserve selected priorities when the form reloads
- **fixed** — Fix the parsing of inbound emails with UTF8 body
- **added** — Add rate-limiting by email in the /accounts/signup view

###### 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

### v4.2

- Date: 2026-04-28
- Version: v4.2
- Original notes: https://github.com/healthchecks/healthchecks/releases/tag/v4.2
- Permalink: https://whatsnew.fyi/product/healthchecks/releases/v4.2

- **changed** — Update the email alert template to cut the beginning of the last ping body
- **changed** — Update the email integration to attach email pings as .eml attachments
- **fixed** — Fix the email integration to handle deep attachment stacks in last ping body
- **fixed** — Fix check name and tag escaping in the Shell integration

###### 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

### v4.1.1

- Date: 2026-03-25
- Version: v4.1.1
- Original notes: https://github.com/healthchecks/healthchecks/releases/tag/v4.1.1
- Permalink: https://whatsnew.fyi/product/healthchecks/releases/v4.1.1

- **fixed** — Fix sendalerts to avoid crashing on a timed out db connection
- **fixed** — Fix the update_timeout view to also kick off nags

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

### v4.1

- Date: 2026-03-20
- Version: v4.1
- Original notes: https://github.com/healthchecks/healthchecks/releases/tag/v4.1
- Permalink: https://whatsnew.fyi/product/healthchecks/releases/v4.1

- **removed** — Remove team size limits so users on all plans can now invite many team members
- **added** — Add a one-line summary at the top of monthly/weekly/daily reports
- **fixed** — Fix a formatting issue in Matrix notification template
- **fixed** — Fix emails to never use non-breaking spaces in plain text emails
- **fixed** — Fix the Change Email form to warn the user about TOTP 2FA
- **fixed** — Fix daily reports to show downtime stats for the previous 2 days instead of months
- **fixed** — Fix incorrect Bearer token handling in the Prometheus metrics endpoint
- **fixed** — Fix the Clone function to copy the filter_http_body and filter_default_fail fields
- **fixed** — Fix the ping handler to reject uppercase letters in slug values

###### 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)

### v4.0

- Date: 2026-01-22
- Version: v4.0
- Original notes: https://github.com/healthchecks/healthchecks/releases/tag/v4.0
- Permalink: https://whatsnew.fyi/product/healthchecks/releases/v4.0

- **removed** — Drop support for Python 3.11 and below; minimum required Python version is now 3.12
- **changed** — Upgrade to Django 6.0
- **changed** — Update the Matrix integration to use Matrix v3 API
- **changed** — Update email alert template to use user's preferred time zone
- **changed** — Update the web UI to use user's preferred timezone instead of browser's timezone
- **added** — Add data migration to update legacy timezones to current canonical timezones
- **changed** — Switch to using multicolor icon font for integration icons
- **fixed** — Fix the text version of email report for recently created checks
- **fixed** — Fix prepare_durations() to assert ping ordering by id not by created date
- **fixed** — Fix the Pause API call and UI action to no-op if the check is already paused

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