InfluxData - Scalable datastore for metrics, events, and real-time analytics.
Cortex Project - Horizontally scalable, highly available, multi-tenant, long term Prometheus.
OpenTSDB - OpenTSDB is a distributed, scalable Time Series Database (TSDB) written on top of HBase.
TimescaleDB - TimescaleDB is a time-series SQL database providing fast analytics, scalability, with automated data management on a proven storage engine.
Google Cloud Dataproc - Managed Apache Spark and Apache Hadoop service which is fast, easy to use, and low cost
Prometheus - An open-source systems monitoring and alerting toolkit.