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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's nothing stopping them creating their own, or including a third party library to do it (I can see kdrag0n's recreation being included by some for example), but they can't use Google's. This might be why OnePlus aren't including it - they're not choosing to remove it, they're simply not recreating it.
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.