Activity formatter does not show changes to fields on alm_asset or CMDB records.

When configuring activity formatter and adding fields. No changes are reflected in the activity stream. No changes are captured.

All

The field might have "No audit" attribute. This will need to be removed. 

1) Open the dictionary entry of the field you want to see in the Activity Stream.
2) Look at the related list "Attributes", find the "no Audit" attribute, and click on the "i". Do not click on the word 'no audit'. (see screenshot, click the icon circled in red). 
3) When its open, click "delete" (see screenshot)