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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.
I would definitely still recommend sp_whoisactive though - it's a great tool. Also, monitoring tools act like a flight recorder providing valuable information that you can use to diagnose performance issues after the event. I created DBA Dash an open-source monitoring tool that you might want to take a look at if you are interested in using a monitoring tool. Also, enabling query store at the DB level provides useful data to troubleshoot and fix performance issues.
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.