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updated CHANGELOG.md for the release 2.6.0 (#6506)
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## Main

* [6435](https://github.com/grafana/loki/pull/6435) **MichelHollands**: Remove the `whole-stream-deletion` mode.
* [6410](https://github.com/grafana/loki/pull/6410) **MichelHollands**: Add support for per tenant delete API access enabling.
* [6105](https://github.com/grafana/loki/pull/6105) **rutgerke** Export metrics for the promtail journal target
* [6099](https://github.com/grafana/loki/pull/6099/files) **cstyan**: Drop lines with malformed JSON in Promtail JSON pipeline stage
* [6136](https://github.com/grafana/loki/pull/6136) **periklis**: Add support for alertmanager header authorization
* [6102](https://github.com/grafana/loki/pull/6102) **timchenko-a**: Add multi-tenancy support to lambda-promtail
* [5971](https://github.com/grafana/loki/pull/5971) **kavirajk**: Record statistics about metadata queries such as labels and series queries in `metrics.go` as well
* [5790](https://github.com/grafana/loki/pull/5790) **chaudum**: Add UDP support for Promtail's syslog target.
* [5984](https://github.com/grafana/loki/pull/5984) **dannykopping** and **salvacorts**: Querier: prevent unnecessary calls to ingesters.
* [5943](https://github.com/grafana/loki/pull/5943) **tpaschalis**: Add support for exclusion patterns in Promtail's static_config
* [5879](https://github.com/grafana/loki/pull/5879) **MichelHollands**: Remove lines matching delete request expression when using "filter-and-delete" deletion mode.
* [5899](https://github.com/grafana/loki/pull/5899) **simonswine**: Update go image to 1.17.9.
* [5888](https://github.com/grafana/loki/pull/5888) **Papawy** Fix common config net interface name overwritten by ring common config
* [5848](https://github.com/grafana/loki/pull/5848) **arcosx**: Add Baidu AI Cloud as a storage backend choice.
* [5799](https://github.com/grafana/loki/pull/5799) **cyriltovena** Fix deduping issues when multiple entries with the same timestamp exist.
* [5799](https://github.com/grafana/loki/pull/5799) **cyriltovena** Fixes deduping issues when multiple entries exists with the same timestamp.
* [5780](https://github.com/grafana/loki/pull/5780) **simonswine**: Update alpine image to 3.15.4.
* [5715](https://github.com/grafana/loki/pull/5715) **chaudum** Add option to push RFC5424 syslog messages from Promtail in syslog scrape target.
* [5696](https://github.com/grafana/loki/pull/5696) **paullryan** don't block scraping of new logs from cloudflare within promtail if an error is received from cloudflare about too early logs.
* [5662](https://github.com/grafana/loki/pull/5662) **ssncferreira** **chaudum** Improve performance of instant queries by splitting range into multiple subqueries that are executed in parallel.
* [5685](https://github.com/grafana/loki/pull/5625) **chaudum** Fix bug in push request parser that allowed users to send arbitrary non-string data as "log line".
* [5707](https://github.com/grafana/loki/pull/5707) **franzwong** Promtail: Rename config name limit_config to limits_config.
* [5626](https://github.com/grafana/loki/pull/5626) **jeschkies** Support multi-tenant select logs and samples queries.
* [5622](https://github.com/grafana/loki/pull/5622) **chaudum**: Fix bug in query splitter that caused `interval` query parameter to be ignored and therefore returning more logs than expected.
* [5521](https://github.com/grafana/loki/pull/5521) **cstyan**: Move stream lag configuration to top level clients config struct and refactor stream lag metric, this resolves a bug with duplicate metric collection when a single Promtail binary is running multiple Promtail clients.
* [5568](https://github.com/grafana/loki/pull/5568) **afayngelerindbx**: Fix canary panics due to concurrent execution of `confirmMissing`
* [5552](https://github.com/grafana/loki/pull/5552) **jiachengxu**: Loki mixin: add `DiskSpaceUtilizationPanel`
* [5541](https://github.com/grafana/loki/pull/5541) **bboreham**: Queries: reject very deeply nested regexps which could crash Loki.
* [5536](https://github.com/grafana/loki/pull/5536) **jiachengxu**: Loki mixin: make labelsSelector in loki chunks dashboards configurable
* [5535](https://github.com/grafana/loki/pull/5535) **jiachengxu**: Loki mixins: use labels selector for loki chunks dashboard
* [5507](https://github.com/grafana/loki/pull/5507) **MichelHollands**: Remove extra param in call for inflightRequests metric.
* [5481](https://github.com/grafana/loki/pull/5481) **MichelHollands**: Add a DeletionMode config variable to specify the delete mode and validate match parameters.
* [5356](https://github.com/grafana/loki/pull/5356) **jbschami**: Enhance lambda-promtail to support adding extra labels from an environment variable value
* [5409](https://github.com/grafana/loki/pull/5409) **ldb**: Enable best effort parsing for Syslog messages
* [5392](https://github.com/grafana/loki/pull/5392) **MichelHollands**: Etcd credentials are parsed as secrets instead of plain text now.
* [5361](https://github.com/grafana/loki/pull/5361) **ctovena**: Add usage report to grafana.com.
* [5289](https://github.com/grafana/loki/pull/5289) **ctovena**: Fix deduplication bug in queries when mutating labels.
* [5302](https://github.com/grafana/loki/pull/5302) **MasslessParticle** Update azure blobstore client to use new sdk.
* [5243](https://github.com/grafana/loki/pull/5290) **ssncferreira**: Update Promtail to support duration string formats.
* [5266](https://github.com/grafana/loki/pull/5266) **jeschkies**: Write Promtail position file atomically on Unix.
* [5280](https://github.com/grafana/loki/pull/5280) **jeschkies**: Fix Docker target connection loss.
* [5243](https://github.com/grafana/loki/pull/5243) **owen-d**: moves `querier.split-queries-by-interval` to limits code only.
* [5139](https://github.com/grafana/loki/pull/5139) **DylanGuedes**: Drop support for legacy configuration rules format.
* [5262](https://github.com/grafana/loki/pull/5262) **MichelHollands**: Remove the labelFilter field
* [4911](https://github.com/grafana/loki/pull/4911) **jeschkies**: Support Docker service discovery in Promtail.
* [5107](https://github.com/grafana/loki/pull/5107) **chaudum** Fix bug in fluentd plugin that caused log lines containing non UTF-8 characters to be dropped.
* [5148](https://github.com/grafana/loki/pull/5148) **chaudum** Add periodic task to prune old expired items from the FIFO cache to free up memory.
* [5187](https://github.com/grafana/loki/pull/5187) **aknuds1** Rename metric `cortex_experimental_features_in_use_total` to `loki_experimental_features_in_use_total` and metric `log_messages_total` to `loki_log_messages_total`.
* [5170](https://github.com/grafana/loki/pull/5170) **chaudum** Fix deadlock in Promtail caused when targets got removed from a target group by the discovery manager.
* [5163](https://github.com/grafana/loki/pull/5163) **chaudum** Fix regression in fluentd plugin introduced with #5107 that caused `NoMethodError` when parsing non-string values of log lines.
* [5144](https://github.com/grafana/loki/pull/5144) **dannykopping** Ruler: fix remote write basic auth credentials.
* [5091](https://github.com/grafana/loki/pull/5091) **owen-d**: Changes `ingester.concurrent-flushes` default to 32
* [5031](https://github.com/grafana/loki/pull/5031) **liguozhong**: Promtail: Add global read rate limiting.
* [4879](https://github.com/grafana/loki/pull/4879) **cyriltovena**: LogQL: add __line__ function to | line_format template.
* [5081](https://github.com/grafana/loki/pull/5081) **SasSwart**: Add the option to configure memory ballast for Loki
* [5085](https://github.com/grafana/loki/pull/5085) **aknuds1**: Upgrade Cortex to [e0807c4eb487](https://github.com/cortexproject/cortex/compare/4e9fc3a2b5ab..e0807c4eb487) and Prometheus to [692a54649ed7](https://github.com/prometheus/prometheus/compare/2a3d62ac8456..692a54649ed7)
* [5067](https://github.com/grafana/loki/pull/5057) **cstyan**: Add a metric to Azure Blob Storage client to track total egress bytes
* [5065](https://github.com/grafana/loki/pull/5065) **AndreZiviani**: lambda-promtail: Add ability to ingest logs from S3
* [4950](https://github.com/grafana/loki/pull/4950) **DylanGuedes**: Implement common instance addr/net interface
* [4949](https://github.com/grafana/loki/pull/4949) **ssncferreira**: Add query `queueTime` metric to statistics and metrics.go
* [4938](https://github.com/grafana/loki/pull/4938) **DylanGuedes**: Implement ring status page for the distributor
* [5023](https://github.com/grafana/loki/pull/5023) **ssncferreira**: Move `querier.split-queries-by-interval` to a per-tenant configuration
* [4993](https://github.com/grafana/loki/pull/4926) **thejosephstevens**: Fix parent of wal and wal_cleaner in loki ruler config docs
* [4933](https://github.com/grafana/loki/pull/4933) **jeschkies**: Support matchers in series label values query.
* [4926](https://github.com/grafana/loki/pull/4926) **thejosephstevens**: Fix comment in Loki module loading for accuracy
* [4920](https://github.com/grafana/loki/pull/4920) **chaudum**: Add `-list-targets` command line flag to list all available run targets
* [4860](https://github.com/grafana/loki/pull/4860) **cyriltovena**: Add rate limiting and metrics to hedging
* [4865](https://github.com/grafana/loki/pull/4865) **taisho6339**: Fix duplicate registry.MustRegister call in Promtail Kafka
* [4845](https://github.com/grafana/loki/pull/4845) **chaudum** Return error responses consistently as JSON
* [6163](https://github.com/grafana/loki/pull/6163) **jburnham**: LogQL: add `default` sprig template function in logql label/line formatter
## Unreleased
# 2.6.0 (date TBD)

### All Changes
Here is the list with the changes that were produced since the previous release.

#### Loki

##### Enhancements
* [5662](https://github.com/grafana/loki/pull/5662) **ssncferreira** **chaudum** Improve performance of instant queries by splitting range into multiple subqueries that are executed in parallel.
* [5848](https://github.com/grafana/loki/pull/5848) **arcosx**: Add Baidu AI Cloud as a storage backend choice.
* [6410](https://github.com/grafana/loki/pull/6410) **MichelHollands**: Add support for per tenant delete API access enabling.
* [5879](https://github.com/grafana/loki/pull/5879) **MichelHollands**: Remove lines matching delete request expression when using "filter-and-delete" deletion mode.
* [6317](https://github.com/grafana/loki/pull/6317/files) **dannykoping**: General: add cache usage statistics
* [5984](https://github.com/grafana/loki/pull/5984) **dannykopping** and **salvacorts**: Querier: prevent unnecessary calls to ingesters.
* [5971](https://github.com/grafana/loki/pull/5971) **kavirajk**: Record statistics about metadata queries such as labels and series queries in `metrics.go` as well
* [6136](https://github.com/grafana/loki/pull/6136) **periklis**: Add support for alertmanager header authorization

##### Fixes
* [6152](https://github.com/grafana/loki/pull/6152) **slim-bean**: Fixes unbounded ingester memory growth when live tailing under specific circumstances.
* [5685](https://github.com/grafana/loki/pull/5685) **chaudum**: Assert that push values tuples consist of string values
* [5685](https://github.com/grafana/loki/pull/5685) **chaudum**: Fix bug in push request parser that allowed users to send arbitrary non-string data as "log line".
* [5799](https://github.com/grafana/loki/pull/5799) **cyriltovena** Fix deduping issues when multiple entries with the same timestamp exist. !hide or not hide (bugfix Loki)
* [5888](https://github.com/grafana/loki/pull/5888) **Papawy** Fix common config net interface name overwritten by ring common config

##### Changes
* [6042](https://github.com/grafana/loki/pull/6042) **slim-bean**: Add a new configuration to allow fudging of ingested timestamps to guarantee sort order of duplicate timestamps at query time.
* [6120](https://github.com/grafana/loki/pull/6120) **KMiller-Grafana**: Rename configuration parameter fudge_duplicate_timestamp to be increment_duplicate_timestamp.
* [5777](https://github.com/grafana/loki/pull/5777) **tatchiuleung**: storage: make Azure blobID chunk delimiter configurable
* [5650](https://github.com/grafana/loki/pull/5650) **cyriltovena**: Remove more chunkstore and schema version below v9
* [5643](https://github.com/grafana/loki/pull/5643) **simonswine**: Introduce a ChunkRef type as part of logproto
* [6435](https://github.com/grafana/loki/pull/6435) **MichelHollands**: Remove the `whole-stream-deletion` mode.
* [5899](https://github.com/grafana/loki/pull/5899) **simonswine**: Update go image to 1.17.9.

#### Promtail

##### Enhancements
* [5715](https://github.com/grafana/loki/pull/5715) **chaudum**: Allow promtail to push RFC5424 formatted syslog messages
* [6105](https://github.com/grafana/loki/pull/6105) **rutgerke** Export metrics for the promtail journal target
* [5943](https://github.com/grafana/loki/pull/5943) **tpaschalis**: Add support for exclusion patterns in Promtail's static_config
* [5790](https://github.com/grafana/loki/pull/5790) **chaudum**: Add UDP support for Promtail's syslog target.
* [6102](https://github.com/grafana/loki/pull/6102) **timchenko-a**: Add multi-tenancy support to lambda-promtail
* [6099](https://github.com/grafana/loki/pull/6099/files) **cstyan**: Drop lines with malformed JSON in Promtail JSON pipeline stage
##### Fixes
* [6034](https://github.com/grafana/loki/pull/6034) **DylanGuedes**: Promtail: Fix symlink tailing behavior.
##### Changes
Expand All @@ -103,7 +50,6 @@

#### Loki Canary
* [6310](https://github.com/grafana/loki/pull/6310) **chodges15**: Add support for client-side TLS certs in loki-canary for Loki connection
* [5568](https://github.com/grafana/loki/pull/5568) **afayngelerindbx**: canary: Adds locking to prevent multiple concurrent invocations of `confirmMissing` from clobbering each other
### Notes

This release was created from a branch starting at commit FIXME but it may also contain backported changes from main.
Expand All @@ -112,7 +58,7 @@ Check the history of the branch FIXME.

### Dependencies

* Go Version: FIXME
* Go Version: 1.17.9

# 2.5.0 (2022/04/07)

Expand Down Expand Up @@ -145,7 +91,6 @@ to include only the most relevant.
* [4938](https://github.com/grafana/loki/pull/4938) **DylanGuedes**: Add distributor ring page
* [4879](https://github.com/grafana/loki/pull/4879) **cyriltovena**: LogQL: add __line__ function to | line_format template
* [4858](https://github.com/grafana/loki/pull/4858) **sandy2008**: feat(): add ManagedIdentity in Azure Blob Storage
## Main
* [5789](https://github.com/grafana/loki/pull/5789) **bboreham**: Production config: add dot to some DNS address to reduce lookups.
* [5780](https://github.com/grafana/loki/pull/5780) **simonswine**: Update alpine image to 3.15.4.
* [5715](https://github.com/grafana/loki/pull/5715) **chaudum** Add option to push RFC5424 syslog messages from Promtail in syslog scrape target.
Expand Down

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