ok I recommend you do an   Activitymap Link/Region report. Pick monthly break down for last few months where drop was seen.   Lets start by finding dropping links them selves.(eventually we hope we can locate key page(s) contributing to loss).

Often times when Activity map tagging is lost it can be related to things like   -Implementation of SPA code(Angular for single page app) so links are no longer tagged. - custom JS code used to activate link clicks vs actual reg standard html links -Broken analytics code on pages that contributed to...

See my comment below on DAU/MAU definition below. In your case to understand UV Excluding login or a given page..   You need to segment users by excluding those visiting a given page only You need to define a prop/evar for users to differentiate logged in/ anonymous state        

So based on the fact you are using Lifecycle DAU or MAU as a reference. You should be able to use Daily/Weekly/Monthly/Yearly Unique Visitors.   See definition of DAU and MAU: https://aep-sdks.gitbook.io/docs/foundation-extensions/mobile-core/lifecycle/lifecycle-metrics   The challenge again here is...

I suspect they are referencing the GA metrics like MAU and DAU. Terms like stickiness engagement are often mentioned with such KPIs.   To Jennifers point which standard MAU or DAU as there are different formulas depending on resource source referenced.   I know in Adobe lifecycle metrics they recent...

As the previous person didn`t include an example URL can you provide one?  Feel free to message me privately if you like. 

Here is a link from previous similar question.   https://experienceleaguecommunities.adobe.com/t5/adobe-analytics-questions/discrepancies-between-adobe-analytics-and-facebook/m-p/546873#M39267   GLTU

So I think you need to clarify a bit by what you want translated.   The data you capture is typically front end web based so the various language formats entered are dependant on the end users browser. Adobe captures language agnostic so whatever you enter(providing its character encoding isn't bad)...

in console tab. Run this script.   _satellite.buildInfo.environment + " : " + new Date (_satellite.buildInfo.buildDate)   It will at least give you some insights to your script and build info.

Like Ravi mentioned, go into debug mode , in console then try and view any rules that fire to see the offending rules.