@mikkeschiren for days that have missing metrics, can you check in the log_link_visit_action table if there are any positive values in the performance dimension columns, for example time_dom_processing, time_dom_completion, time_network, etc.?

@diosmosis - values were in fact NULL on the dates with no data that I tested, how could this happen?

@mikkeschiren are you using the normal javascript tracking? Those values should actually be automatically tracked in this case (if the users browser provides them).

I will check with our analysts if they have done some changes on some dates, but with the results we are getting, that does not really make sense (couple of days per month that we have results, and then thousands of them, and next day none). But with that said - it could be an implementation problem.

@sgiehl wouldn't it be expected in some cases when the tracking request is sent before the browser load event for example and there is no follow up load event?

Yes. indeed. If the page tracking event is sent before the performance metrics are available they will be sent with the next tracking request. If no further tracking request is sent, the performance metrics might not be tracked at all.
It might work to trigger a ping once the page was completely loaded

This could be a implementation issue, I think we can close this now.

👍 thanks for letting us know @mikkeschiren