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971711a546
This commit builds on top of the introduced per scheduling group statistics template and employs it for achieving a per scheduling group statistics in storage_proxy. Some of the statistics also had meaning as a global - per shard one. Those are the ones for determining if to throttle the write request. This was handled by creating a global stats struct that will hold those stats and by changing the stat update to also include the global one. One point that complicated it is an already existing aggregation over the per shard stats that now became a per scheduling group per shard stats, converting the aggregation to a two-dimensional aggregation. One thing this commit doesn't handle is validating that an individual statistic didn't "cross a scheduling group boundary", such validation is possible but it can easily be added in the future. There is a subtlety to doing so since if the operation did cross to other scheduling group two connected statistics can lose balance for example written bytes and completed write transactions. Signed-off-by: Eliran Sinvani <eliransin@scylladb.com>