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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.
Almost everything on your list is a case of just not having enough time spent administering Google Workspace. Even the GAM complaint is moot if you revoke the generated API keys when you are not actively using GAM, or you can use a Yubikey. https://github.com/GAM-team/GAM/wiki/Use-a-Yubikey
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.