Backend Changes

New Features

• Add support for adaptive sampling with a Cassandra backend. (#2966, @joe-elliott, @Ashmita152)

Bug fixes, Minor Improvements

• Migrate elasticsearch rollover to go (#3242, @rubenvp8510)
• Add 'opensearch' as a supported value for SPAN_STORAGE_TYPE (#3255, @yurishkuro)
• Support graceful shutdown in grpc plugin (#3249, @slon)
• Enable gzip compression for collector grpc endpoint. (#3236, @slon)
• Use UTC in es-index-cleaner (#3261, @pavolloffay)
• Upgrade to alpine-3.14 (#3304, @nontw)
• refactor: move from io/ioutil to io and os package (#3294, @Juneezee)
• Changed sampling type env var and updated collector help text (#3302, @joe-elliott)
• Close #3270: Prevent rollover lookback from passing the Unix epoch (#3299, @ctreatma)
• Fixing otel configuration in docker compose (#3286, @Ashmita152)
• Added ability to pass config file to grpc plugin in integration tests (#3253, @EinKrebs)

UI Changes

• UI pinned to version 1.17.0. The changelog is available here v1.17.0