v0.14.0

[0.14.0] - 2026-08-30

Upgrade notes

A timestamp field with format auto now reads HTTP-dates

Interpret the value as → a timestamp with format auto previously accepted a
number (epoch seconds or milliseconds) or an ISO 8601 string, and reported
anything else as Not a valid timestamp (UNKNOWN). It now also accepts an
HTTP-date — Wed, 21 Oct 2015 07:28:00 GMT — because that is what
Last-Modified, Expires and a date-form Retry-After contain, and those only
became reachable in this release (see the @header. paths below).

Effect: a field that was stuck at UNKNOWN because its value was an HTTP-date
now resolves to a real age. If that field has upper levels configured, it can go
WARN or CRIT on the next check where it previously sat UNKNOWN. This only affects
fields explicitly configured as timestamps whose value is an HTTP-date; the
explicit ISO 8601 format is unchanged and stays strict.

Features

• Give piggyback hosts host labels from their own element (#165) (07b7799)
• Pick response headers instead of typing '@Header.' paths (#162) (3c904b6)
• Compute a ratio from a second path with the 'other' variable (#160) (c294cdf)
• Read a value from a response header with an '@Header.' path (#159) (bbd8828)

Fixes

• Do not crash the rule form when a required field is emptied (#163) (2928cc4)

Other

• The 0.14.0 forum announcement and its upgrade note (#166) (d5c16db)
• Deps: Bump ruff from 0.16.3 to 0.16.4 (#154) (a0d3da8)
• Use Checkmk's own click-outside and key-shortcut helpers (#158) (c3f2d44)
• Bump the actions group with 2 updates (#155) (deddc2d)
• Deps: Bump mypy from 2.3.0 to 2.3.1 (#153) (e628584)
• Collapse duplicated logic, no behaviour change (#157) (7fa1e91)
• Bump the actions group with 2 updates (#152) (37aa37e)
• Deps: Bump ruff from 0.16.1 to 0.16.3 (#151) (b0aaa34)
• Refresh the Exchange listing, four releases behind (#150) (f9aac06)
• Add the 0.13.0 forum announcement (#149) (c9613a8)