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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 don't catch it what changes can you do to your logging to enable it? Can you push it out to the environment? While sysmon is awesome, you can do your hunts with built in logging most of the time... Just might not have all the data around it you want to have. I would throw sysmon on a test box (make sure you have a config file that filters out the noise: https://github.com/SwiftOnSecurity/sysmon-config)
If you have not yet looked at it, check out mitre att&ck https://attack.mitre.org/
Agreed in general. But with stuff like SIGMA, I'd lean towards stuff should going into git. Better version control, your docs can be markdown and live right next to your threat library, you can strap on CI/CD (so you can deploy/run stuff as part of a pipeline). Confluence is a great start, but it doesn't scale well.