LoginSign Up
← Back to all sparks
Prometheus logo

Prometheus

DEVOPS
Velocity5.0

Monitoring system

prometheus.io ↗

Prometheus 3.14 ships the release candidate unchanged, duration expressions now on by default

monitoringpromqltsdbservice-discoveryperformance
◆Current state
3.14.0 is byte-identical to the 3.14.0-rc.0 body published a week earlier, so the stable cut carries exactly what the candidate previewed: PromQL duration expressions enabled by default with the feature flag retired, first_over_time promoted to stable, Oracle Cloud service discovery added, and a set of start-timestamp experiments still behind flags. The performance work is the substantive half, with regex matchers on literal alternations, native histogram scrape parsing down roughly 49% in allocations, and a recursion-free text parser that closes a stack-overflow path on hostile exposition.
◆Where it's heading
The project is spending its feature budget on start timestamps, appearing across PromQL, TSDB encoding, and remote write V2 in the same release but held behind use-start-timestamps and histograms-st-encoding. Everything else follows the established rhythm of promoting one experimental function per cycle and adding a cloud discovery source. The API deprecations are being staged carefully, warning now and rejecting at the next major.
◆Prediction
Start timestamps are the obvious candidate to lose their feature flags once the encoding and remote-write halves have run together, and the stats parameter values now warned on will be rejected in the next major.

◆Recent moves

  1. 23h ago

    Prometheus 3.14: duration expressions on by default, OCI discovery, faster histogram parsing

    The stable cut of 3.14, shipping the release candidate's contents unchanged. It graduates duration expressions and first_over_time out of feature flags, adds Oracle Cloud service discovery, and lands the parsing and regex performance work — incremental against the start-timestamp groundwork still behind flags.

    View source ↗
  2. 7d ago

    3.14 release candidate: duration expressions on by default, first_over_time stable

    The candidate whose body 3.14.0 reproduces verbatim, previewing duration expressions on by default and first_over_time promoted to stable.

    View source ↗
  3. 19d ago

    3.13.2: CVE dependency bumps and a SIGBUS fix on full disks

    A patch on the 3.13 line clearing CVE dependency bumps and a SIGBUS on full disks — maintenance between feature cuts.

    View source ↗
  4. 1mo ago

    3.13.1 LTS: head-chunk cache returned samples from the wrong chunk

    An LTS patch fixing a head-chunk cache that returned samples from the wrong chunk, the kind of correctness bug that argues for staying current on the LTS line.

    View source ↗
  5. 1mo ago

    3.5.5: sanitize-html bump for CVE-2026-53606

    A dependency bump on the older 3.5 LTS for a sanitize-html CVE, with no functional change.

    View source ↗
  6. 1mo ago

    3.13.0-rc.0: release candidate for the 3.13 LTS

    The first candidate for the 3.13 LTS, carried here only as trajectory context for the release rhythm.

    View source ↗