Grafana dashboard for new Falco metrics introduced in 0.38

[leogr]

Motivation

See falcosecurity/falco#3132

Feature

Add a new Grafana dashboard for Falco metrics.

Additional context

• TBD: We still have to think about the shape of the dashboard and how to present the metrics.

/assign
/assign @alacuku

[incertum]

Thanks @leogr for opening this dedicated issues.

Perhaps we need multiple dashboards.

• One dashboard could be tailored to replace https://github.com/falcosecurity/falco-exporter
• Another one could be focused on performance overhead tracking, we could use it for [Tracking] Falco Prometheus Support for Falco Metrics cncf-green-review-testing#12
• ... more specialized dashboards given that we have a lot of metrics users can tap into

[incertum]

@leogr another question re the rules counters. We sanitize the rules name to conform with the Open Metric standard. should we maybe add the original rules name (all original characters) as label as well so it can be displayed more nicely in the dashboard?