*: cut v2.6.0-rc.0 (#4958)

* *: cut v2.6.0-rc.0
Signed-off-by: NSimon Pasquier <spasquie@redhat.com>

* Add #4926
Signed-off-by: NSimon Pasquier <spasquie@redhat.com>

* Address Brian's comments
Signed-off-by: NSimon Pasquier <spasquie@redhat.com>

* Address Goutham's comments
Signed-off-by: NSimon Pasquier <spasquie@redhat.com>

CHANGELOG.md

+## 2.6.0-rc.0 / 2018-12-05
+
+* [CHANGE] Include default flags to the container's entrypoint. #4796
+* [CHANGE] Promtool: Remove the `update` command. #3839
+* [FEATURE] Add JSON log format via the `--log.format` flag. #4876
+* [FEATURE] API: Add /api/v1/labels endpoint to get all label names. #4835
+* [FEATURE] Web: Allow setting the page's title via the `--web.ui-title` flag. #4841
+* [ENHANCEMENT] Add `prometheus_tsdb_lowest_timestamp_seconds`, `prometheus_tsdb_head_min_time_seconds` and `prometheus_tsdb_head_max_time_seconds` metrics. #4888
+* [ENHANCEMENT] Add `rule_group_last_evaluation_timestamp_seconds` metric. #4852
+* [ENHANCEMENT] Add `prometheus_template_text_expansion_failures_total` and `prometheus_template_text_expansions_total` metrics. #4747
+* [ENHANCEMENT] Set consistent User-Agent header in outgoing requests. #4891
+* [ENHANCEMENT] Azure SD: Add the machine's power state to the discovery metadata. #4908
+* [ENHANCEMENT] Azure SD: Error out at load time when authentication parameters are missing. #4907
+* [ENHANCEMENT] EC2 SD: Add the machine's private DNS name to the discovery metadata. #4693
+* [ENHANCEMENT] EC2 SD: Add the operating system's platform to the discovery metadata. #4663
+* [ENHANCEMENT] Kubernetes SD: Add the pod's phase to the discovery metadata. #4824
+* [ENHANCEMENT] Kubernetes SD: Log Kubernetes messages. #4931
+* [ENHANCEMENT] Promtool: Collect CPU and trace profiles. #4897
+* [ENHANCEMENT] Promtool: Support writing output as JSON. #4848
+* [ENHANCEMENT] Remote Read: Return available data if remote read fails partially. #4832
+* [ENHANCEMENT] Remote Write: Improve queue performance. #4772
+* [ENHANCEMENT] Remote Write: Add min_shards parameter to set the minimum number of shards. #4924
+* [ENHANCEMENT] TSDB: Improve WAL reading. #4953
+* [ENHANCEMENT] TSDB: Memory improvements. #4953
+* [ENHANCEMENT] Web: Log stack traces on panic. #4221
+* [ENHANCEMENT] Web UI: Add copy to clipboard button for configuration. #4410
+* [ENHANCEMENT] Web UI: Support console queries at specific times. #4764
+* [ENHANCEMENT] Web UI: group targets by job then instance. #4898 #4806
+* [BUGFIX] Deduplicate handler labels for HTTP metrics. #4732
+* [BUGFIX] Fix leaked queriers causing shutdowns to hang. #4922
+* [BUGFIX] Fix configuration loading panics on nil pointer slice elements. #4942
+* [BUGFIX] API: Correctly skip mismatching targets on /api/v1/targets/metadata. #4905
+* [BUGFIX] API: Better rounding for incoming query timestamps. #4941
+* [BUGFIX] Azure SD: Fix panic. #4867
+* [BUGFIX] Console templates: Fix hover when the metric has a null value. #4906
+* [BUGFIX] Discovery: Remove all targets when the scrape configuration gets empty. #4819
+* [BUGFIX] Marathon SD: Fix leaked connections. #4915
+* [BUGFIX] Marathon SD: Use 'hostPort' member of portMapping to construct target endpoints. #4887
+* [BUGFIX] PromQL: Fix a goroutine leak in the lexer/parser. #4858
+* [BUGFIX] Scrape: Pass through content-type for non-compressed output. #4912
+* [BUGFIX] Scrape: Fix deadlock in the scrape's manager. #4894
+* [BUGFIX] Scrape: Scrape targets at fixed intervals even after Prometheus restarts. #4926
+* [BUGFIX] TSDB: Support restored snapshots including the head properly. #4953
+* [BUGFIX] TSDB: Repair WAL when the last record in a segment is torn. #4953
+* [BUGFIX] Web: Avoid proxy to connect to the local gRPC server. #4572
+
 ## 2.5.0 / 2018-11-06
 
 * [CHANGE] Group targets by scrape config instead of job name. #4806 #4526

VERSION

-2.5.0
+2.6.0-rc.0