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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.
If you want to know the actual limit number - it's 64KB (w3c/beacon issue, wpt PR). However, you should not take that as a guarantee!
There's a new API you can use to compress data on client side: compression
If you want to play with API and events by yourself and confirm, I've put up a demo at https://github.com/xg-wang/how-to-beacon/. Notice this is not for production, read more below.
NOTE:
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Hence, a higher number means a more popular project.