Commits on Mar 29, 2022

1. Implement GRPC query API …

   With the current GRPC APIs, layering Thanos Queriers results in
   the root querier getting all of the samples and executing the query
   in memory. As a result, the intermediary Queriers do not do any
   intensive work and merely transport samples from the Stores to the
   root Querier.
   
   When data is perfectly sharded, users can implement a pattern where
   the root Querier instructs the intermediary ones to execute the queries
   from their stores and return back results. The results can then be
   concatenated by the root querier and returned to the user.
   
   In order to support this use case, this commit implements a GRPC API
   in the Querier which is analogous to the HTTP Query API exposed
   by Prometheus.
   
   Signed-off-by: fpetkovski <filip.petkovsky@gmail.com>

   

   fpetkovski committed Mar 29, 2022
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