Stream-querying Ingester v2 hits message size limits

[pstibrany]

v2QueryStream method of Ingester can produce messages that are still too be to be sent over gRPC. Right now its logic is to send batches of 128 time series, but if timeseries contain many samples (eg. when asking for large time range), it may still hit gRPC message size limit.

With 6 samples/minute, over 12h time that is 4000+ samples for single timeseries. If we batch 128 of them, that is 500k + samples in single batch.

Batching in v2QueryStream ingester could be a little smarter to avoid hitting the limit.

[pstibrany]

Increasing grpc message size limit, or enabling compression on grpc connections from querier/ruler and ingester can help to fix the problem.