Log Message:
prometheus: update to 2.48.1.

# Changelog

## 2.48.1 / 2023-12-08

* [BUGFIX] TSDB: Make the wlog watcher read segments synchronously when not \ 
tailing. #13224
* [BUGFIX] Agent: Participate in notify calls (fixes slow down in remote write \ 
handling introduced in 2.45). #13223

## 2.48.0 / 2023-11-16

* [CHANGE] Remote-write: respect Retry-After header on 5xx errors. #12677
* [FEATURE] Alerting: Add AWS SigV4 authentication support for Alertmanager \ 
endpoints. #12774
* [FEATURE] Promtool: Add support for histograms in the TSDB dump command. #12775
* [FEATURE] PromQL: Add warnings (and annotations) to PromQL query results. \ 
#12152 #12982 #12988 #13012
* [FEATURE] Remote-write: Add Azure AD OAuth authentication support for remote \ 
write requests. #12572
* [ENHANCEMENT] Remote-write: Add a header to count retried remote write \ 
requests. #12729
* [ENHANCEMENT] TSDB: Improve query performance by re-using iterator when moving \ 
between series. #12757
* [ENHANCEMENT] UI: Move /targets page discovered labels to expandable section #12824
* [ENHANCEMENT] TSDB: Optimize WBL loading by not sending empty buffers over \ 
channel. #12808
* [ENHANCEMENT] TSDB: Reply WBL mmap markers concurrently. #12801
* [ENHANCEMENT] Promtool: Add support for specifying series matchers in the TSDB \ 
analyze command. #12842
* [ENHANCEMENT] PromQL: Prevent Prometheus from overallocating memory on \ 
subquery with large amount of steps. #12734
* [ENHANCEMENT] PromQL: Add warning when monotonicity is forced in the input to \ 
histogram_quantile. #12931
* [ENHANCEMENT] Scraping: Optimize sample appending by reducing garbage. #12939
* [ENHANCEMENT] Storage: Reduce memory allocations in queries that merge series \ 
sets. #12938
* [ENHANCEMENT] UI: Show group interval in rules display. #12943
* [ENHANCEMENT] Scraping: Save memory when scraping by delaying creation of \ 
buffer. #12953
* [ENHANCEMENT] Agent: Allow ingestion of out-of-order samples. #12897
* [ENHANCEMENT] Promtool: Improve support for native histograms in TSDB analyze \ 
command. #12869
* [ENHANCEMENT] Scraping: Add configuration option for tracking staleness of \ 
scraped timestamps. #13060
* [BUGFIX] SD: Ensure that discovery managers are properly canceled. #10569
* [BUGFIX] TSDB: Fix PostingsForMatchers race with creating new series. #12558
* [BUGFIX] TSDB: Fix handling of explicit counter reset header in histograms. #12772
* [BUGFIX] SD: Validate HTTP client configuration in HTTP, EC2, Azure, Uyuni, \ 
PuppetDB, and Lightsail SDs. #12762 #12811 #12812 #12815 #12814 #12816
* [BUGFIX] TSDB: Fix counter reset edgecases causing native histogram panics. #12838
* [BUGFIX] TSDB: Fix duplicate sample detection at chunk size limit. #12874
* [BUGFIX] Promtool: Fix errors not being reported in check rules command. #12715
* [BUGFIX] TSDB: Avoid panics reported in logs when head initialization takes a \ 
long time. #12876
* [BUGFIX] TSDB: Ensure that WBL is repaired when possible. #12406
* [BUGFIX] Storage: Fix crash caused by incorrect mixed samples handling. #13055
* [BUGFIX] TSDB: Fix compactor failures by adding min time to histogram chunks. \ 
#13062

## 2.47.1 / 2023-10-04

* [BUGFIX] Fix duplicate sample detection at chunk size limit #12874

## 2.47.0 / 2023-09-06

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. #12571 #12643
* [FEATURE] Scraping: Optionally limit detail on dropped targets, to save \ 
memory. #12647
* [ENHANCEMENT] TSDB: Write head chunks to disk in the background to reduce \ 
blocking. #11818
* [ENHANCEMENT] PromQL: Speed up aggregate and function queries. #12682
* [ENHANCEMENT] PromQL: More efficient evaluation of query with `timestamp()`. #12579
* [ENHANCEMENT] API: Faster streaming of Labels to JSON. #12598
* [ENHANCEMENT] Agent: Memory pooling optimisation. #12651
* [ENHANCEMENT] TSDB: Prevent storage space leaks due to terminated snapshots on \ 
shutdown. #12664
* [ENHANCEMENT] Histograms: Refactoring and optimisations. #12352 #12584 #12596 \ 
#12711 #12054
* [ENHANCEMENT] Histograms: Add `histogram_stdvar` and `histogram_stddev` \ 
functions. #12614
* [ENHANCEMENT] Remote-write: add http.resend_count tracing attribute. #12676
* [ENHANCEMENT] TSDB: Support native histograms in snapshot on shutdown. #12722
* [BUGFIX] TSDB/Agent: ensure that new series get written to WAL on rollback. #12592
* [BUGFIX] Scraping: fix infinite loop on exemplar in protobuf format. #12737

## 2.46.0 / 2023-07-25

* [FEATURE] Promtool: Add PromQL format and label matcher set/delete commands to \ 
promtool. #11411
* [FEATURE] Promtool: Add push metrics command. #12299
* [ENHANCEMENT] Promtool: Read from stdin if no filenames are provided in check \ 
rules. #12225
* [ENHANCEMENT] Hetzner SD: Support larger ID's that will be used by Hetzner in \ 
September. #12569
* [ENHANCEMENT] Kubernetes SD: Add more labels for endpointslice and endpoints \ 
role. #10914
* [ENHANCEMENT] Kubernetes SD: Do not add pods to target group if the PodIP \ 
status is not set. #11642
* [ENHANCEMENT] OpenStack SD: Include instance image ID in labels. #12502
* [ENHANCEMENT] Remote Write receiver: Validate the metric names and labels. #11688
* [ENHANCEMENT] Web: Initialize `prometheus_http_requests_total` metrics with \ 
`code` label set to `200`. #12472
* [ENHANCEMENT] TSDB: Add Zstandard compression option for wlog. #11666
* [ENHANCEMENT] TSDB: Support native histograms in snapshot on shutdown. #12258
* [ENHANCEMENT] Labels: Avoid compiling regexes that are literal. #12434
* [BUGFIX] Histograms: Fix parsing of float histograms without zero bucket. #12577
* [BUGFIX] Histograms: Fix scraping native and classic histograms missing some \ 
histograms. #12554
* [BUGFIX] Histograms: Enable ingestion of multiple exemplars per sample. 12557
* [BUGFIX] File SD: Fix path handling in File-SD watcher to allow directory \ 
monitoring on Windows. #12488
* [BUGFIX] Linode SD: Cast `InstanceSpec` values to `int64` to avoid overflows \ 
on 386 architecture. #12568
* [BUGFIX] PromQL Engine: Include query parsing in active-query tracking. #12418
* [BUGFIX] TSDB: Handle TOC parsing failures. #10623

## 2.45.0 / 2023-06-23

This release is a LTS (Long-Term Support) release of Prometheus and will
receive security, documentation and bugfix patches for at least 12 months.
Please read more about our LTS release cycle at
<https://prometheus.io/docs/introduction/release-cycle/>.

* [FEATURE] API: New limit parameter to limit the number of items returned by \ 
`/api/v1/status/tsdb` endpoint. #12336
* [FEATURE] Config: Add limits to global config. #12126
* [FEATURE] Consul SD: Added support for `path_prefix`. #12372
* [FEATURE] Native histograms: Add option to scrape both classic and native \ 
histograms. #12350
* [FEATURE] Native histograms: Added support for two more arithmetic operators \ 
`avg_over_time` and `sum_over_time`. #12262
* [FEATURE] Promtool: When providing the block id, only one block will be loaded \ 
and analyzed. #12031
* [FEATURE] Remote-write: New Azure ad configuration to support remote writing \ 
directly to Azure Monitor workspace. #11944
* [FEATURE] TSDB: Samples per chunk are now configurable with flag \ 
`storage.tsdb.samples-per-chunk`. By default set to its former value 120. #12055
* [ENHANCEMENT] Native histograms: bucket size can now be limited to avoid \ 
scrape fails. #12254
* [ENHANCEMENT] TSDB: Dropped series are now deleted from the WAL sooner. #12297
* [BUGFIX] Native histograms: ChunkSeries iterator now checks if a new sample \ 
can be appended to the open chunk. #12185
* [BUGFIX] Native histograms: Fix Histogram Appender `Appendable()` segfault. #12357
* [BUGFIX] Native histograms: Fix setting reset header to gauge histograms in \ 
seriesToChunkEncoder. #12329
* [BUGFIX] TSDB: Tombstone intervals are not modified after Get() call. #12245
* [BUGFIX] TSDB: Use path/filepath to set the WAL directory. #12349

## 2.44.0 / 2023-05-13

This version is built with Go tag `stringlabels`, to use the smaller data
structure for Labels that was optional in the previous release. For more
details about this code change see #10991.

* [CHANGE] Remote-write: Raise default samples per send to 2,000. #12203
* [FEATURE] Remote-read: Handle native histograms. #12085, #12192
* [FEATURE] Promtool: Health and readiness check of prometheus server in CLI. #12096
* [FEATURE] PromQL: Add `query_samples_total` metric, the total number of \ 
samples loaded by all queries. #12251
* [ENHANCEMENT] Storage: Optimise buffer used to iterate through samples. #12326
* [ENHANCEMENT] Scrape: Reduce memory allocations on target labels. #12084
* [ENHANCEMENT] PromQL: Use faster heap method for `topk()` / `bottomk()`. #12190
* [ENHANCEMENT] Rules API: Allow filtering by rule name. #12270
* [ENHANCEMENT] Native Histograms: Various fixes and improvements. #11687, \ 
#12264, #12272
* [ENHANCEMENT] UI: Search of scraping pools is now case-insensitive. #12207
* [ENHANCEMENT] TSDB: Add an affirmative log message for successful WAL repair. \ 
#12135
* [BUGFIX] TSDB: Block compaction failed when shutting down. #12179
* [BUGFIX] TSDB: Out-of-order chunks could be ignored if the write-behind log \ 
was deleted. #12127

## 2.43.1 / 2023-05-03

* [BUGFIX] Labels: `Set()` after `Del()` would be ignored, which broke some \ 
relabeling rules. #12322

## 2.43.0 / 2023-03-21

We are working on some performance improvements in Prometheus, which are only
built into Prometheus when compiling it using the Go tag `stringlabels`
(therefore they are not shipped in the default binaries). It uses a data
structure for labels that uses a single string to hold all the label/values,
resulting in a smaller heap size and some speedups in most cases. We would like
to encourage users who are interested in these improvements to help us measure
the gains on their production architecture. We are providing release artefacts
`2.43.0+stringlabels` and Docker images tagged `v2.43.0-stringlabels` with those
improvements for testing. #10991

* [FEATURE] Promtool: Add HTTP client configuration to query commands. #11487
* [FEATURE] Scrape: Add `scrape_config_files` to include scrape configs from \ 
different files. #12019
* [FEATURE] HTTP client: Add `no_proxy` to exclude URLs from proxied requests. #12098
* [FEATURE] HTTP client: Add `proxy_from_environment` to read proxies from env \ 
variables. #12098
* [ENHANCEMENT] API: Add support for setting lookback delta per query via the \ 
API. #12088
* [ENHANCEMENT] API: Change HTTP status code from 503/422 to 499 if a request is \ 
canceled. #11897
* [ENHANCEMENT] Scrape: Allow exemplars for all metric types. #11984
* [ENHANCEMENT] TSDB: Add metrics for head chunks and WAL folders size. #12013
* [ENHANCEMENT] TSDB: Automatically remove incorrect snapshot with index that is \ 
ahead of WAL. #11859
* [ENHANCEMENT] TSDB: Improve Prometheus parser error outputs to be more \ 
comprehensible. #11682
* [ENHANCEMENT] UI: Scope `group by` labels to metric in autocompletion. #11914
* [BUGFIX] Scrape: Fix `prometheus_target_scrape_pool_target_limit` metric not \ 
set before reloading. #12002
* [BUGFIX] TSDB: Correctly update `prometheus_tsdb_head_chunks_removed_total` \ 
and `prometheus_tsdb_head_chunks` metrics when reading WAL. #11858
* [BUGFIX] TSDB: Use the correct unit (seconds) when recording out-of-order \ 
append deltas in the `prometheus_tsdb_sample_ooo_delta` metric. #12004

## 2.42.0 / 2023-01-31

This release comes with a bunch of feature coverage for native histograms and \ 
breaking changes.

If you are trying native histograms already, we recommend you remove the `wal` \ 
directory when upgrading.
Because the old WAL record for native histograms is not backward compatible in \ 
v2.42.0, this will lead to some data loss for the latest data.

Additionally, if you scrape "float histograms" or use recording rules \ 
on native histograms in v2.42.0 (which writes float histograms),
it is a one-way street since older versions do not support float histograms.

* [CHANGE] **breaking** TSDB: Changed WAL record format for the experimental \ 
native histograms. #11783
* [FEATURE] Add 'keep_firing_for' field to alerting rules. #11827
* [FEATURE] Promtool: Add support of selecting timeseries for TSDB dump. #11872
* [ENHANCEMENT] Agent: Native histogram support. #11842
* [ENHANCEMENT] Rules: Support native histograms in recording rules. #11838
* [ENHANCEMENT] SD: Add container ID as a meta label for pod targets for \ 
Kubernetes. #11844
* [ENHANCEMENT] SD: Add VM size label to azure service discovery. #11650
* [ENHANCEMENT] Support native histograms in federation. #11830
* [ENHANCEMENT] TSDB: Add gauge histogram support. #11783 #11840 #11814
* [ENHANCEMENT] TSDB/Scrape: Support FloatHistogram that represents buckets as \ 
float64 values. #11522 #11817 #11716
* [ENHANCEMENT] UI: Show individual scrape pools on /targets page. #11142

## 2.41.0 / 2022-12-20

* [FEATURE] Relabeling: Add `keepequal` and `dropequal` relabel actions. #11564
* [FEATURE] Add support for HTTP proxy headers. #11712
* [ENHANCEMENT] Reload private certificates when changed on disk. #11685
* [ENHANCEMENT] Add `max_version` to specify maximum TLS version in \ 
`tls_config`. #11685
* [ENHANCEMENT] Add `goos` and `goarch` labels to `prometheus_build_info`. #11685
* [ENHANCEMENT] SD: Add proxy support for EC2 and LightSail SDs #11611
* [ENHANCEMENT] SD: Add new metric `prometheus_sd_file_watcher_errors_total`. #11066
* [ENHANCEMENT] Remote Read: Use a pool to speed up marshalling. #11357
* [ENHANCEMENT] TSDB: Improve handling of tombstoned chunks in iterators. #11632
* [ENHANCEMENT] TSDB: Optimize postings offset table reading. #11535
* [BUGFIX] Scrape: Validate the metric name, label names, and label values after \ 
relabeling. #11074
* [BUGFIX] Remote Write receiver and rule manager: Fix error handling. #11727

## 2.40.7 / 2022-12-14

* [BUGFIX] Use Windows native DNS resolver. #11704
* [BUGFIX] TSDB: Fix queries involving negative buckets of native histograms. #11699

## 2.40.6 / 2022-12-09

* [SECURITY] Security upgrade from go and upstream dependencies that include
  security fixes to the net/http and os packages. #11691