Predicate Details

This page contains a form to view and edit all properties of a predicate, including scoped overrides and the evaluation expressions used by the background engine.

Scope controls

• Server Tag: apply this predicate only to servers that have the selected tag.
• Server Group: limit the predicate to servers belonging to a specific group.
• Server: target a single SQL instance for this override.
• Database: restrict the predicate to a particular database.
• Object: restrict the predicate to a specific object (for example, a file, table, or index).
• Use the scope controls to create a scoped override; leaving a field empty makes the override less specific (broader).

Editable expressions and fields

• Evaluation Expression: the boolean expression the engine evaluates. The default is “actual = expected”, but you can change this to any valid expression supported by the engine (for example “actual < expected” or “actual > low AND actual < high”).
• Expected Expression: the expected value or expression to compare against. This may be a constant (e.g., 20), a computed expression, or one of the available properties of the object being checked.
• Actual Expression: the expression that yields the measured value to be evaluated (typically the name of a property from the underlying object, e.g., free_percent or file_size_gb).
• Property Name: the logical name used to identify the property in UIs and reports. It maps the actual expression to a friendly identifier and can be used by other parts of the system to reference this value (for example in charts or exported data).
• Filter Expression: an optional expression that narrows the set of objects the predicate applies to. Use it to include or exclude specific objects so the check only runs against matching items (for example: database_name = ‘X’ AND file_type = ’log’).

Behavior and helpers

• Save applies the changes and creates or updates an override for the selected scope. Changing any property (including disabling) counts as an override.