OpenTSDB 2.2.0

• Version 2.2.0 (2016-02-14)
  • Add the option to randomly assign UIDs to metrics to improve distribution across
    HBase region servers.
  • Introduce salting of data to improve distribution of high cardinality regions
    across region servers.
  • Introduce query stats for tracking various timings related to TSD queries.
  • Add more stats endpoints including /threads, /jvm and /region_clients
  • Allow for deleting UID mappings via CLI or the API
  • Name the various threads for easier debugging, particularly for distinguishing
    between TSD and AsyncHBase threads.
  • Allow for pre-fetching all of the meta information for the tables to improve
    performance.
  • Update to the latest AsyncHBase with support for secure HBase clusters and RPC
    timeouts.
  • Allow for overriding metric and tag widths via the config file. (Be careful!)
  • URLs from the API are now relative instead of absolute, allowing for easier reverse
    proxy use.
  • Allow for percent deviation in the Nagios check
  • Let queries skip over unknown tag values that may not exist yet (via config)
  • Add various query filters such as case (in)sensitive pipes, wildcards and pipes
    over tag values. Filters do not work over metrics at this time.
  • Add support for writing data points using Appends in HBase as a way of writing
    compacted data without having to read and re-write at the top of each hour.
  • Introduce an option to emit NaNs or Nulls in the JSON output when downsampling and
    a bucket is missing values.
  • Introduce query time flags to show the original query along with some timing stats
    in the response.
  • Introduce a storage exception handler plugin that will allow users to spool or
    requeue data points that fail writes to HBase due to various issues.
  • Rework the HTTP pipeline to support plugins with RPC implementations.
  • Allow for some style options in the Gnuplot graphs.
  • Allow for timing out long running HTTP queries.
  • Text importer will now log and continue bad rows instead of failing.
  • New percentile and count aggregators.
  • Add the /api/annotations endpoint to fetch multiple annotations in one call.
  • Add a class to support improved bulk imports by batching requests in memory for a
    full hour before writing.
  • Allow overriding the metric and tag UID widths via config file instead of
    having to modify the source code.
  • Rework the QueryStats output to be a bit more useful and add timings from the
    various scanners and query components.
  • Modify the UI to allow for group by or aggregate per tag (use the new query feature)
  • Rework the UI skin with the new TSDB logo and color scheme.
  • Add the QueryLog config to logback.xml so users can optionally enable logging of
    all queries along with their stats.