WHAT WE REPORT
We display the number of custom fields for all types of objects (standard, custom and managed package objects). You can sort alphabetically by object name or by number of fields. You can filter the bar chart by the type of object.
The type of object can be seen by the text after the object name. "Standard" is a standard object. "Custom" is a custom object in the core system. If the object is installed by a managed package then the namespace is displayed after the object name e.g. Batch Log Map. Q9.
ACTIONS TO TAKE
If you reach your field maximum limits you cannot add any more fields. You may be able to upgrade your Salesforce Edition to increase field counts.
Or, you can delete fields. Deleting custom fields is tricky and requires some detective work: has the field got any data? Where is it used: email templates, page layouts, process builder workflows, etc.?
Fortunately, this information is calculated and displayed in the Org Model at object and field level, saving a huge amount of work digging into setup.
Elements Org Model: Field %filled by record type
Elements Org Model: Field usage
Salesforce Help: Field limits by Edition
Salesforce Help: Delete fields
Salesforce: Custom Fields Summary