* doc: add a doc on how to track user metric using action log
Signed-off-by: feng-tao <fengtao04@gmail.com>

* chore: update doc
Signed-off-by: feng-tao <fengtao04@gmail.com>

* Update docs/tutorials/how-to-track-user-metric.md
Signed-off-by: Tao Feng <fengtao04@gmail.com>
Co-authored-by: jornh <jornhansen@gmail.com>

* Update docs/tutorials/how-to-track-user-metric.md
Signed-off-by: Tao Feng <fengtao04@gmail.com>
Co-authored-by: jornh <jornhansen@gmail.com>

* Update docs/tutorials/how-to-track-user-metric.md
Signed-off-by: Tao Feng <fengtao04@gmail.com>
Co-authored-by: jornh <jornhansen@gmail.com>
Co-authored-by: jornh <jornhansen@gmail.com>