thanos-io · bwplotka · Apr 18, 2019 · Apr 10, 2019 · Apr 18, 2019 · Apr 18, 2019
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -11,45 +11,118 @@ We use *breaking* word for marking changes that are not backward compatible (rel
 
 ## Unreleased
 
+## [v0.4.0-rc.0](https://github.com/improbable-eng/thanos/releases/tag/v0.4.0-rc.0) - 2019.04.12
+
+:warning: **IMPORTANT** :warning: This is the last release that supports gossip. From Thanos v0.5.0, gossip will be completely removed.
+
+This release also disables gossip mode by default for all components.
+See [this](docs/proposals/approved/201809_gossip-removal.md) for more details.
+
 ### Added
-- [#811](https://github.com/improbable-eng/thanos/pull/811) Remote write receiver
-- [#798](https://github.com/improbable-eng/thanos/pull/798) Ability to limit the maximum concurrent about of Series() calls in Thanos Store and the maximum amount of samples.
+
+- [#811](https://github.com/improbable-eng/thanos/pull/811) Remote write receiver component :heart: :heart: thanks to RedHat (@brancz) contribution.
 - [#910](https://github.com/improbable-eng/thanos/pull/910) Query's stores UI page is now sorted by type and old DNS or File SD stores are removed after 5 minutes (configurable via the new `--store.unhealthy-timeout=5m` flag).
-- [#905](https://github.com/improbable-eng/thanos/pull/905) New Query API: /api/v1/labels. Noticed that the API was added in Prometheus v2.6.
+- [#905](https://github.com/improbable-eng/thanos/pull/905) Thanos support for Query API: /api/v1/labels. Notice that the API was added in Prometheus v2.6.
+- [#798](https://github.com/improbable-eng/thanos/pull/798) Ability to limit the maximum number of concurrent request to Series() calls in Thanos Store and the maximum amount of samples we handle.
 
 New options:
 
-* `--store.grpc.series-sample-limit` limits the amount of samples that might be retrieved on a single Series() call. By default it is 0. Consider enabling it by setting it to more than 0 if you are running on limited resources.
-* `--store.grpc.series-max-concurrency` limits the number of concurrent Series() calls in Thanos Store. By default it is 20. Considering making it lower or bigger depending on the scale of your deployment.
-* `--index.generate-missing-cache-file` if enabled, on startup compactor runs an on-off job that scans all the blocks to find all blocks with missing index cache file. It generates those if needed and upload. By default is disabled. Check logs on existence the line `generating index cache files is done`, then you can disable this flag. 
+  New Store flags:
+
+    * `--store.grpc.series-sample-limit` limits the amount of samples that might be retrieved on a single Series() call. By default it is 0. Consider enabling it by setting it to more than 0 if you are running on limited resources.
+    * `--store.grpc.series-max-concurrency` limits the number of concurrent Series() calls in Thanos Store. By default it is 20. Considering making it lower or bigger depending on the scale of your deployment.
+
+  New Store metrics:
+
+    * `thanos_bucket_store_queries_dropped_total` shows how many queries were dropped due to the samples limit;
+    * `thanos_bucket_store_queries_concurrent_max` is a constant metric which shows how many Series() calls can concurrently be executed by Thanos Store;
+    * `thanos_bucket_store_queries_in_flight` shows how many queries are currently "in flight" i.e. they are being executed;
+    * `thanos_bucket_store_gate_duration_seconds` shows how many seconds it took for queries to pass through the gate in both cases - when that fails and when it does not.
+
+  New Store tracing span:
+    * `store_query_gate_ismyturn` shows how long it took for a query to pass (or not) through the gate.
+
+- [#1016](https://github.com/improbable-eng/thanos/pull/1016) Added option for another DNS resolver (miekg/dns client). 
+Note that this is required to have SRV resolution working on [Golang 1.11+ with KubeDNS below v1.14](https://github.com/golang/go/issues/27546)
 
-New metrics:
-* `thanos_bucket_store_queries_dropped_total` shows how many queries were dropped due to the samples limit;
-* `thanos_bucket_store_queries_concurrent_max` is a constant metric which shows how many Series() calls can concurrently be executed by Thanos Store;
-* `thanos_bucket_store_queries_in_flight` shows how many queries are currently "in flight" i.e. they are being executed;
-* `thanos_bucket_store_gate_duration_seconds` shows how many seconds it took for queries to pass through the gate in both cases - when that fails and when it does not.
+   New Querier and Ruler flag: `-- store.sd-dns-resolver` which allows to specify resolver to use. Either `golang` or `miekgdns`
+   
+- [#986](https://github.com/improbable-eng/thanos/pull/986) Allow to save some startup & sync time in store gateway as it is no longer needed to compute index-cache from block index on its own for larger blocks.
+  The store Gateway still can do it, but it first checks bucket if there is index-cached uploaded already. 
+  In the same time, compactor precomputes the index cache file on every compaction. 
 
-New tracing span:
-* `store_query_gate_ismyturn` shows how long it took for a query to pass (or not) through the gate.
+  New Compactor flag: `--index.generate-missing-cache-file` was added to allow quicker addition of index cache files. If enabled it precomputes missing files on compactor startup. Note that it will take time and it's only one-off step per bucket.
 
 :warning: **WARNING** :warning: #798 adds a new default limit to Thanos Store: `--store.grpc.series-max-concurrency`. Most likely you will want to make it the same as `--query.max-concurrent` on Thanos Query.
 
-- [#970](https://github.com/improbable-eng/thanos/pull/970) Added `PartialResponseStrategy` field for `RuleGroups` for `Ruler`.
-- [#1016](https://github.com/improbable-eng/thanos/pull/1016) Added option for another DNS resolver (miekg/dns client). 
-This to have SRV resolution working on [Golang 1.11+ with KubeDNS below v1.14](https://github.com/golang/go/issues/27546)
-- [#986](https://github.com/improbable-eng/thanos/pull/986) Store index cache files in object storage, reduces store start-up time by skipping the generating the index cache for all blocks and only do this for recently created uncompacted blocks. 
+- [#887](https://github.com/improbable-eng/thanos/pull/887) Compact: Added new `--block-sync-concurrency` flag, which allows you to configure number of goroutines to use when syncing block metadata from object storage.
+
+- [#928](https://github.com/improbable-eng/thanos/pull/928) Query: Added `--store.response-timeout` flag. If a Store doesn't send any data in this specified duration then a Store will be ignored and partial data will be returned if it's enabled. 0 disables timeout.
+- [#893](https://github.com/improbable-eng/thanos/pull/893) S3 storage backend has graduated to `stable` maturity level.
+- [#936](https://github.com/improbable-eng/thanos/pull/936) Azure storage backend has graduated to `stable` maturity level.
+- [#937](https://github.com/improbable-eng/thanos/pull/937) S3: added trace functionality. You can add `trace.enable: true` to enable the minio client's verbose logging.
+- [#953](https://github.com/improbable-eng/thanos/pull/953) Compact: now has a hidden flag `--debug.accept-malformed-index`. Compaction index verification will ignore out of order label names.
+- [#963](https://github.com/improbable-eng/thanos/pull/963) GCS: added possibility to inline ServiceAccount into GCS config.
+- [#1010](https://github.com/improbable-eng/thanos/pull/1010) Compact: added new flag `--compact.concurrency`. Number of goroutines to use when compacting groups.
+- [#1028](https://github.com/improbable-eng/thanos/pull/1028) Query: added `--query.default-evaluation-interval`, which sets default evaluation interval for sub queries.
 
 ### Changed 
+
 - [#970](https://github.com/improbable-eng/thanos/pull/970) Deprecated partial_response_disabled proto field. Added partial_response_strategy instead. Both in gRPC and Query API.
-- [#970](https://github.com/improbable-eng/thanos/pull/970) No `PartialResponseStrategy` field for `RuleGroups` by default means `abort` strategy (old PartialResponse disabled) as this is recommended option for Rules and alerts.
+  No `PartialResponseStrategy` field for `RuleGroups` by default means `abort` strategy (old PartialResponse disabled) as this is recommended option for Rules and alerts.
+
+  Metrics:
+
+    * Added `thanos_rule_evaluation_with_warnings_total` to Ruler.
+    * DNS `thanos_ruler_query_apis*` are now `thanos_ruler_query_apis_*` for consistency.
+    * DNS `thanos_querier_store_apis*` are now `thanos_querier_store_apis__*` for consistency.
+    * Query Gate `thanos_bucket_store_series*` are now `thanos_bucket_store_series___*` for consistency.
+    * Most of thanos ruler metris related to rule manager has `strategy` label.
+
+  Ruler tracing spans:
+
+    * `/rule_instant_query HTTP[client]` is now `/rule_instant_query_part_resp_abort HTTP[client]"` if request is for abort strategy.
+
+- [#1009](https://github.com/improbable-eng/thanos/pull/1009): Upgraded Prometheus (~v2.7.0-rc.0 to v2.8.1)  and TSDB (`v0.4.0` to `v0.6.1`) deps.
+
+  Changes that affects Thanos:
+   * query: 
+     * [ENHANCEMENT] In histogram_quantile merge buckets with equivalent le values. #5158.   
+     * [ENHANCEMENT] Show list of offending labels in the error message in many-to-many scenarios. #5189   
+     * [BUGFIX] Fix panic when aggregator param is not a literal. #5290
+   * ruler: 
+     * [ENHANCEMENT] Reduce time that Alertmanagers are in flux when reloaded. #5126
+     * [BUGFIX] prometheus_rule_group_last_evaluation_timestamp_seconds is now a unix timestamp. #5186
+     * [BUGFIX] prometheus_rule_group_last_duration_seconds now reports seconds instead of nanoseconds. Fixes our [issue #1027](https://github.com/improbable-eng/thanos/issues/1027)
+     * [BUGFIX] Fix sorting of rule groups. #5260
+   * store: [ENHANCEMENT] Fast path for EmptyPostings cases in Merge, Intersect and Without.
+   * tooling: [FEATURE] New dump command to tsdb tool to dump all samples.
+   * compactor: [ENHANCEMENT] When closing the db any running compaction will be cancelled so it doesn't block.
+
+  For ruler essentially whole TSDB CHANGELOG applies beween v0.4.0-v0.6.1: https://github.com/prometheus/tsdb/blob/master/CHANGELOG.md
+
+  Note that this was added on TSDB and Prometheus: [FEATURE] Time-ovelapping blocks are now allowed. #370
+  Whoever due to nature of Thanos compaction (distributed systems), for safety reason this is disabled for Thanos compactor for now.
+
+- [#868](https://github.com/improbable-eng/thanos/pull/868) Go has been updated to 1.12.
 
 ### Fixed
-- [#921](https://github.com/improbable-eng/thanos/pull/921) `thanos_objstore_bucket_last_successful_upload_time` now does not appear when no blocks have been uploaded so far
+
+- [#921](https://github.com/improbable-eng/thanos/pull/921) `thanos_objstore_bucket_last_successful_upload_time` now does not appear when no blocks have been uploaded so far.
 - [#966](https://github.com/improbable-eng/thanos/pull/966) Bucket: verify no longer warns about overlapping blocks, that overlap `0s` 
+- [#848](https://github.com/improbable-eng/thanos/pull/848) Compact: now correctly works with time series with duplicate labels.
+- [#894](https://github.com/improbable-eng/thanos/pull/894) Thanos Rule: UI now correctly shows evaluation time.
+- [#865](https://github.com/improbable-eng/thanos/pull/865) Query: now properly parses DNS SRV Service Discovery.
+- [#889](https://github.com/improbable-eng/thanos/pull/889) Store: added safeguard against merging posting groups segfault
+- [#941](https://github.com/improbable-eng/thanos/pull/941) Sidecar: added better handling of intermediate restarts.
+- [#933](https://github.com/improbable-eng/thanos/pull/933) Query: Fixed 30 seconds lag of adding new store to query.
+- [#962](https://github.com/improbable-eng/thanos/pull/962) Sidecar: Make config reloader file writes atomic. 
+- [#982](https://github.com/improbable-eng/thanos/pull/982) Query: now advertises Min & Max Time accordingly to the nodes.
 
 ## [v0.3.2](https://github.com/improbable-eng/thanos/releases/tag/v0.3.2) - 2019.03.04
 
 ### Added
+
 - [#851](https://github.com/improbable-eng/thanos/pull/851) New read API endpoint for api/v1/rules and api/v1/alerts.
 - [#873](https://github.com/improbable-eng/thanos/pull/873) Store: fix set index cache LRU
 
@@ -58,12 +131,14 @@ broken so it was unbounded all the time. From this release actual value matters
 the old behaviour (no boundary), use a large enough value.
 
 ### Fixed
+
 - [#833](https://github.com/improbable-eng/thanos/issues/833) Store Gateway matcher regression for intersecting with empty posting.
 - [#867](https://github.com/improbable-eng/thanos/pull/867) Fixed race condition in sidecare between reloader and shipper.
 
 ## [v0.3.1](https://github.com/improbable-eng/thanos/releases/tag/v0.3.1) - 2019.02.18
 
 ### Fixed
+
 - [#829](https://github.com/improbable-eng/thanos/issues/829) Store Gateway crashing due to `slice bounds out of range`.
 - [#834](https://github.com/improbable-eng/thanos/issues/834) Store Gateway matcher regression for `<>` `!=`.
 

diff --git a/VERSION b/VERSION
@@ -1 +1 @@
-0.3.2-master
+0.4.0-rc.0