2.47.0-rc.0 / 2023-08-25

[bboreham]

This release adds an experimental OpenTelemetry (OTLP) Ingestion feature, and also new setting keep_dropped_targets to limit the amount of dropped targets held in memory. This defaults to 0 meaning 'no limit', so we encourage users with large Prometheus to try setting a limit such as 100.

• [FEATURE] Web: Add OpenTelemetry (OTLP) Ingestion endpoint. Add OTLP Ingestion endpoint #12571 Add initial OTLP ingestion docs #12643
• [FEATURE] Scraping: Optionally limit detail on dropped targets, to save memory. scraping: optionally limit detail on dropped targets, to save memory #12647
• [ENHANCEMENT] TSDB: Write head chunks to disk in the background to reduce blocking. Use a linked list for memSeries.headChunk #11818
• [ENHANCEMENT] PromQL: Speed up aggregate and function queries. promql engine: check unique labels using existing map #12682
• [ENHANCEMENT] PromQL: More efficient evaluation of query with timestamp(). Don't recreate iterator for each series on each timestep when evaluating a query with timestamp() #12579
• [ENHANCEMENT] API: Faster streaming of Labels to JSON. Faster streaming of Labels to JSON #12598
• [ENHANCEMENT] Agent: Memory pooling optimisation. Use zeropool when replaying agent's DB WAL #12651
• [ENHANCEMENT] TSDB: Prevent storage space leaks due to terminated snapshots on shutdown. Cleanup temporary chunk snapshot dirs #12664
• [ENHANCEMENT] Histograms: Refactoring and optimisations. Hide histogram chunk append and reset header internals #12352 histogram: Identify native histograms even without observations #12584 enhance FloatHistogram CopyToSchema method #12596 enhance float histogram add and sub method #12711 Add a chunk size limit in bytes #12054
• [ENHANCEMENT] Histograms: Add histogram_stdvar and histogram_stddev functions. Add histogram_stdvar and histogram_stddev functions #12614
• [ENHANCEMENT] Remote-write: add http.resend_count tracing attribute. remote-write: add http.resend_count tracing attribute #12676
• [ENHANCEMENT] TSDB: Support native histograms in snapshot on shutdown. Remove native histograms / memory snapshot restriction #12722
• [BUGFIX] TSDB/Agent: ensure that new series get written to WAL on rollback. tsdb/agent: ensure that new series get written to WAL on rollback #12592
• [BUGFIX] Scraping: fix infinite loop on exemplar in protobuf format. textparse: fix infinite loop during exemplar parsing #12737

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This discussion was created from the release 2.47.0-rc.0 / 2023-08-25.