Add README for adaptive sampling

[yurishkuro]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.82%. Comparing base (9bdd368) to head (72a2545).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5955   +/-   ##
=======================================
  Coverage   96.82%   96.82%           
=======================================
  Files         345      345           
  Lines       16518    16518           
=======================================
  Hits        15993    15993           
  Misses        339      339           
  Partials      186      186           

Flag	Coverage Δ
badger_v1	8.03% <ø> (ø)
badger_v2	1.82% <ø> (ø)
cassandra-3.x-v1	16.62% <ø> (ø)
cassandra-3.x-v2	1.75% <ø> (ø)
cassandra-4.x-v1	16.62% <ø> (ø)
cassandra-4.x-v2	1.75% <ø> (ø)
elasticsearch-6.x-v1	18.79% <ø> (ø)
elasticsearch-7.x-v1	18.84% <ø> (ø)
elasticsearch-8.x-v1	19.04% <ø> (ø)
elasticsearch-8.x-v2	1.82% <ø> (+0.01%)	⬆️
grpc_v1	9.48% <ø> (ø)
grpc_v2	7.16% <ø> (ø)
kafka-v1	9.74% <ø> (ø)
kafka-v2	1.82% <ø> (ø)
memory_v2	1.81% <ø> (ø)
opensearch-1.x-v1	18.90% <ø> (+0.01%)	⬆️
opensearch-2.x-v1	18.89% <ø> (-0.02%)	⬇️
opensearch-2.x-v2	1.82% <ø> (+0.01%)	⬆️
tailsampling-processor	0.46% <ø> (ø)
unittests	95.30% <ø> (ø)

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