Metrics by stream type

[joonas-fi]

The database itself could help us get universal timeseries metrics by counting encrypted (to exclude plaintext meta events like subscriptions etc.) log messages posted to stream patterns like:

Countable thing	Stream pattern	Pattern meaning
User logins	/+/users/+/logins	/<tenant>/users/<userid>/logins
Sensors observations	/+/sensors/+	/<tenant>/sensors/<sensorId>
Comments posted	/+/comments/+	/<tenant>/comments/<threadid>
SSL certificates renewed	/+/tls-certificates/+	/<tenant>/tls-certificates/<managedCertificateId>

Also we can get:

• all in aggregate (over all tenants)
• breakdowns by tenant

This can be done somewhat securely without needing access to encryption keys if we only use metadata (log entry # per stream), assuming streams are granular enough.