Feature Request: The transaction throttler can be run in dry-run / monitoring-only mode

[ejortegau]

Feature Description

This feature would allow to have the TxThrottler run in a way in which users can get observability about the scope of throttling that could/would take place in their deployments via the TxThrottler metrics, without throttling actually taking place. That is, it would emit the metrics indicating if/when throttling takes place, but queries would still be served normally instead of potentially being throttled.

Use Case(s)

This can be useful for new adopters of the TxThrottler who would like to understand how it would behave in their production environment, without actually having to deal with queries being really throttled.