# Healthchecks v3.12

- Product: Healthchecks (https://whatsnew.fyi/product/healthchecks)
- Vendor: Pēteris Caune
- Date: 2025-11-26
- Version: v3.12
- Original notes: https://github.com/healthchecks/healthchecks/releases/tag/v3.12
- Permalink: https://whatsnew.fyi/product/healthchecks/releases/v3.12

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'.

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- **added** — Add rate limiting and a default ntfy.sh token support for ntfy notifications
- **changed** — Sort checks in daily/weekly/monthly reports by downtime duration, then by name
- **changed** — Generate lower-case ping keys to work around broken email providers
- **added** — After creating a ping key show a dialog displaying the new ping key
- **added** — Add a tooltip with timestamp in the checks table, Last Ping column
- **changed** — Update the Zulip transport to allow addressing users by User ID
- **added** — Add hc_check_grace and hc_check_paused Prometheus metrics
- **changed** — Update Docker base image to python:3.13.9-slim-trixie
- **fixed** — Fix cron schedule formatting in Discord notifications
- **fixed** — Fix cron schedule formatting in Rocket.Chat notifications in mobile app

###### Improvements
- Add rate limiting and a default ntfy.sh token support for ntfy notifications
- Sort checks in daily/weekly/monthly reports by downtime duration, then by name (#1095)
- Generate lower-case ping keys to work around broken email providers (#1218)
- After creating a ping key show a dialog displaying the new ping key (#1222)
- Add a tooltip with timestamp in the checks table, "Last Ping" column (#1040)
- Update the Zulip transport to allow addressing users by User ID (#771)
- Add hc_check_grace and hc_check_paused Prometheus metrics (#897, #915)
- Update Docker base image to python:3.13.9-slim-trixie (#1233)

###### Bug Fixes
- Fix cron schedule formatting in Discord notifications
- Fix cron schedule formatting in Rocket.Chat notifications (in mobile app)