Postgres distributed scaler software now fully OSS
LinkedIn are using Pinot for this use case, with a super-low-latency querying requirement:
InFlow requires storage of tens of TBs of data with a retention of 30 days. To support its real-time troubleshooting use case, the data must be queryable in real-time with sub-second latency so that engineers can query the data without any hassles during outages. For the storage layer, InFlow leverages Apache Pinot.