Commits on Feb 19, 2021

1. sampling: use a data stream for sampled trace docs (elastic#4707) …

   * beater: add Managed and Namespace to ServerParams
   
   This enables x-pack/apm-server code to alter behaviour
   based on whether APM Server is managed or not, and to
   create data streams with the configured namespace.
   
   * sampling: use a data stream for sampled trace docs
   
   Update tail-based sampling to index into and search a
   data stream. The data stream will be associated with an
   ILM policy that takes care of rollover and deletion.
   
   When running in Fleet-managed mode, apm-server will expect
   the data stream and ILM policy to exist for the data stream
   called `traces-sampled-<namespace>`. Servers participating
   in tail-based sampling are required to be configured with
   the same namespace.
   
   When running in standalone mode, apm-server will attempt
   to create an index template and ILM policy for a data
   stream called `apm-sampled-traces`. This is added for
   minimal support while we transition things to Fleet, and
   is intended to be removed in a future release. The data
   stream is not intended to adhere to the standard indexing
   strategy.
   
   * apmpackage: add traces-sampled-* data stream
   
   Add a data stream for sampled trace documents,
   along with an ILM policy which rolls over after
   1h, and then deletes after 1h.
   
   * systemtest: fetch most recent beats monitoring doc
   
   When searching for beats monitoring docs, make sure
   we get the most recent one by sorting on 'timestamp'.
   
   * systemtest: update tail-based sampling test
   
   Update test to rely on apm-server to create its
   own data stream index template.
   
   * Cross-reference sampling/pubsub and apmpackage
   # Conflicts:
   #	changelogs/head.asciidoc
   #	systemtest/elasticsearch.go

   

   axw committed Feb 19, 2021
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