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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.
There'a an app called QuickTiles that should let you access the Volume Panel through a tile in the quick settings. Here's the GitLab page. It's available on F-droid and there are other apps with similar names on the Play Store too.
NOTE:
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Hence, a higher number means a more popular project.