Although the data for these statistics is made available via MediaWiki's API, users must explicitly opt in to make the aggregate forms available in XTools.Alternatively, a whole project can elect to be opted in by filing a request on Phabricator. Your wiki should have had a local discussion showing consensus for these statistics to be allowed.
How to opt in
To opt in, a user must create the page Special:MyPage/EditCounterOptIn.js (as in
User:<username>/EditCounterOptIn.js) on each wiki they want to opt in for.
This page should be created with any content (it just has to have some content).
To opt in on all projects, they must create meta:Special:MyPage/EditCounterGlobalOptIn.js (as in
User:<username>/EditCounterGlobalOptIn.js) on MetaWiki.
Again, the actual content of this page is irrelevant.
How to opt out
To opt out the relevant user page (single-wiki or global; see above) should be blanked or deleted.