prometheus/prometheus 2.20.0 / 2020-07-22

  • This release changes WAL compression from opt-in to default. WAL compression will prevent a downgrade to v2.10 or earlier without deleting the WAL. Disable WAL compression explicitly by setting the command line flag --no-storage.tsdb.wal-compression if you require downgrading to v2.10 or earlier.

    • [CHANGE] promtool: Changed rule numbering from 0-based to 1-based when reporting rule errors. #7495
    • [CHANGE] Remote read: Added prometheus_remote_storage_read_queries_total counter and prometheus_remote_storage_read_request_duration_seconds histogram, removed prometheus_remote_storage_remote_read_queries_total counter.
    • [CHANGE] Remote write: Added buckets for longer durations to prometheus_remote_storage_sent_batch_duration_seconds histogram.
    • [CHANGE] TSDB: WAL compression is enabled by default. #7410
    • [FEATURE] PromQL: Added group() aggregator. #7480
    • [FEATURE] SD: Added Docker Swarm SD. #7420
    • [FEATURE] SD: Added DigitalOcean SD. #7407
    • [FEATURE] SD: Added Openstack config option to query alternative endpoints. #7494
    • [ENHANCEMENT] Configuration: Exit early on invalid config file and signal it with exit code 2. #7399
    • [ENHANCEMENT] PromQL: without is now a valid metric identifier. #7533
    • [ENHANCEMENT] PromQL: Optimized regex label matching for literals within the pattern or as prefix/suffix. #7453 #7503
    • [ENHANCEMENT] promtool: Added time range parameters for labels API in promtool. #7463
    • [ENHANCEMENT] Remote write: Include samples waiting in channel in pending samples metric. Log number of dropped samples on hard shutdown. #7335
    • [ENHANCEMENT] Scrape: Ingest synthetic scrape report metrics atomically with the corresponding scraped metrics. #7562
    • [ENHANCEMENT] SD: Reduce timeouts for Openstack SD. #7507
    • [ENHANCEMENT] SD: Use 10m timeout for Consul watches. #7423
    • [ENHANCEMENT] SD: Added AMI meta label for EC2 SD. #7386
    • [ENHANCEMENT] TSDB: Increment WAL corruption metric also on WAL corruption during checkpointing. #7491
    • [ENHANCEMENT] TSDB: Improved query performance for high-cardinality labels. #7448
    • [ENHANCEMENT] UI: Display dates as well as timestamps in status page. #7544
    • [ENHANCEMENT] UI: Improved scrolling when following hash-fragment links. #7456
    • [ENHANCEMENT] UI: React UI renders numbers in alerts in a more human-readable way. #7426
    • [BUGFIX] API: Fixed error status code in the query API. #7435
    • [BUGFIX] PromQL: Fixed avg and avg_over_time for NaN, Inf, and float64 overflows. #7346
    • [BUGFIX] PromQL: Fixed off-by-one error in histogram_quantile. #7393
    • [BUGFIX] promtool: Support extended durations in rules unit tests. #6297
    • [BUGFIX] Scrape: Fix undercounting for scrape_samples_post_metric_relabeling in case of errors. #7342
    • [BUGFIX] TSDB: Don’t panic on WAL corruptions. #7550
    • [BUGFIX] TSDB: Avoid leaving behind empty files in chunks_head, causing startup failures. #7573
    • [BUGFIX] TSDB: Fixed race between compact (gc, populate) and head append causing unknown symbol error. #7560
    • [BUGFIX] TSDB: Fixed unknown symbol error during head compaction. #7526
    • [BUGFIX] TSDB: Fixed panic during TSDB metric registration. #7501
    • [BUGFIX] TSDB: Fixed --limit command line flag in tsdb tool. #7430

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