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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Others have mentioned some great operators for managing in-cluster postgres databases, but if you're looking to manage external or previously existing databases: https://github.com/movetokube/postgres-operator
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.