Upgrade to Prometheus 2.2.1

[gozer]

2.2.1 / 2018-03-13

• [BUGFIX] Fix data loss in TSDB on compaction
• [BUGFIX] Correctly stop timer in remote-write path
• [BUGFIX] Fix deadlock triggerd by loading targets page
• [BUGFIX] Fix incorrect buffering of samples on range selection queries
• [BUGFIX] Handle large index files on windows properly

2.2.0 / 2018-03-08

• [CHANGE] Rename file SD mtime metric.
• [CHANGE] Send target update on empty pod IP in Kubernetes SD.
• [FEATURE] Add API endpoint for flags.
• [FEATURE] Add API endpoint for dropped targets.
• [FEATURE] Display annotations on alerts page.
• [FEATURE] Add option to skip head data when taking snapshots.
• [ENHANCEMENT] Federation performance improvement.
• [ENHANCEMENT] Read bearer token file on every scrape.
• [ENHANCEMENT] Improve typeahead on /graph page.
• [ENHANCEMENT] Change rule file formatting.
• [ENHANCEMENT] Set consul server default to localhost:8500.
• [ENHANCEMENT] Add dropped Alertmanagers to API info endpoint.
• [ENHANCEMENT] Add OS type meta label to Azure SD.
• [ENHANCEMENT] Validate required fields in SD configuration.
• [BUGFIX] Prevent stack overflow on deep recursion in TSDB.
• [BUGFIX] Correctly read offsets in index files that are greater than 4GB.
• [BUGFIX] Fix scraping behavior for empty labels.
• [BUGFIX] Drop metric name for bool modifier.
• [BUGFIX] Fix races in discovery.
• [BUGFIX] Fix Kubernetes endpoints SD for empty subsets.
• [BUGFIX] Throttle updates from SD providers, which caused increased CPU usage and allocations.
• [BUGFIX] Fix TSDB block reload issue.
• [BUGFIX] Fix PromQL printing of empty without().
• [BUGFIX] Don't reset FiredAt for inactive alerts.
• [BUGFIX] Fix erroneous file version changes and repair existing data.