0.5.0-rc4

This is an intermediate release that fixes a redis connection that failed to be closed and adds an api route that is used with the Grafana bosun app plugin.

bosun:

• add missing redis connection close #1755
• Fix ungroup to actually return a scalar #1744
• Allow series func to create empty group #1745
• move graphite and tsdb funcs to their own files #1742
• series operations #1672
• support png on egraph api route #1712
• fix braced variable expansion when used in macros #1722
• skiplast cmdline switch for development #1725
• add month func to get end of or start of month #1740
• stopping notifications that should no longer fire #1716
• fix query links on expr page #1675
• link multiple queries from graph UI #1676
• clear filters when changing metrics in graph view #1685
• support actions by incident id #1696
• fix issue removing last annotation from graph view #1639
• don't autocomplete old metrics on graph page #1660
• func to turn seconds (scalars) to duration string #1669
• series func to create series from scalars #1667
• add Ledis bind address config option #1651
• convert datastore to Ledisdb/redis implementation. #1332
• don't panic on opentsdb version #1629
• adding "unknownIsNormal" flag to alerts to convert unknown events into normal ones. #1620
• push annotations to top on graph page #1619
• add remote mac addresses to the host API #1551
• add UnmarshalJSON() to Status type #1555
• 2x API routes: Metadata for all metrics, metrics per tagk #1560
• denormalized metadata should resolve to parent metric #1519
• Show bar graph on the expr page if type == number #1011
• annotate support #1610
• fixing ledis error saving temp config. #1614
• Auto-Closing open alerts if alert doesn't exist anymore. #1604
• angular to from 1.2.x to 1.5 #1603
• Implementing purge and forceCLose actions #1599
• Add linelr func #1602
• optimizing redis access to get tag sets #1575
• serving temporary configs from redis. #1593
• Notifications moved to redis #1592
• fixing bug with chained notifications. #1584
• fixing empty email body, and handling absence better #1588
• fix migration from new install #1581
• performing a preliminary save on new incidents to keep templates consistent #1605
• Don't create filter in Opentsdb v2.1 #1569
• Add over, shift, and merge funcs #1598
• Shorten-only http proxy #1590

scollector:

• fastly collector #1728
• fastly status.io monitoring and status.io lib #1735
• Additional functionality into ExtraHop collector #1698
• Make MaxMem kill switch configurable #1652
• fix error: interval.go:64: c_google_analytics: #1641
• negative -f filters and total_time metric for httpunit collector #1630
• add metadata to redis collector #1622
• Fix for unset MaxQueueLen #1596

docs:

• Documenting force close and purge actions. #1697
• Fixing of typos and avoiding a potential ambiguity #1691

bosun/expr:

• fix crash on invalid graphite tags #1663

collect:

• Flush purges internal collections as well. #1552

WIP:

• Govendor #1594

travisci:

• add start/signal/stop test for bosun #1580

other:

• List open incidents #1764
• revendor annotate after repo move #1708
• Add html function to templates #1721
• Adds resource reference to bosun_emitter #1727
• Remove unnecessary go get in travis #1706
• Fix merge #1673
• Small utility to clean up search data for a metric. #1632
• tod(scalar) was returning minutes as hours #1677
• Annotate edit view #1636
• moving version to _version #1637
• working party of elastic.v3 #1562
• Elastic v2 support and elastic expr refactor #1561
• Escape soapLogin credentials #1612
• Fixed link and Go version #1609
• WIP Incident Redis Refactoring Madness #1497