«Item Diagnostic» UI Action

The way the Item Diagnostic works is that once you click the UI Action, the script include CatalogItemDiagnosticScore is initiate, by giving it the cat_item sys_id, and its method "processItem" is called. The script include then searches in the Diagnostic Rule table, and for each rule it calls the relevant method.

• checkBalancedContainers (it checks that for each containerStart there is an equivalent containerEnd)
• checkDuplicateVariables
• checkAJAX (This searches both for AJAX calls but also for GlideRecord calls to avoid not best practices client-server calls)
• checkDOMManipulation
• checkSelectBoxUnique
• checkUserCriteriaUsage
• checkOrderGuideRuleBaseCount (Checks for high number of active rule bases in an Order Guide as higher number of rule bases can potentially lead to slower load times)
• checkLookupVariableRowCount
• checkFormatterVariablesUsage (Checks if the item has the following variable types:
  1. Macro
  2. Macro with label
  3. UI Page variable type)

Being the logic defined in the Script Include, it is also possible to enhance this feature and add more Rules in the Item Diagnostic.

For example it can be very useful to have a rule that checks if catalog ui policies, ui policies actions & clients scripts of a catalog item are referencing to variables that do not exist in catalog item, maybe because it had previously deleted.

Another simple Rule could be to check whether the Item has at least a Workflow or a Flow (or an execution plan?), linked to it.

Or perhaps a rule to verify that an item has short description and description, and that the Icon and Picture, if defined, are not corrupted/missing. This happens sometimes when moving between environments.

All of the above could be achieved by defining the rule in the Diagnostic Rule table, and then writing the relevant script in the above mentioned Script Include.

ServiceNow also provide a Diagnostic Result Report, which gives an overview of Catalog Items that have been marked as containing violations of the recommendations. The report can be accessed from the Request Reports menu under Service Catalog -->Catalog Administration.

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