make flag to optionally print/suppress aux variable creation printing

framework/doc/content/source/actions/MaterialOutputAction.md

@@ -0,0 +1,9 @@
+# MaterialOutputAction
+
+!syntax description /Outputs/MaterialOutputAction
+
+This [Action.md] is used to output the material properties computed by a [Material](syntax/Materials/index.md)
+or a [FunctorMaterial](syntax/FunctorMaterials/index.md) to an auxiliary variable.
+Vector, tensor, and array-valued properties can be output to variables prefixed with the component or index.
+
+!syntax parameters /Outputs/MaterialOutputAction

framework/src/actions/MaterialOutputAction.C

@@ -31,10 +31,16 @@ InputParameters
 MaterialOutputAction::validParams()
 {
   InputParameters params = Action::validParams();
+  params.addClassDescription("Outputs material properties to various Outputs objects, based on the "
+                             "parameters set in each Material");
   /// A flag to tell this action whether or not to print the unsupported properties
   /// Note: A derived class can set this to false, override materialOutput and output
   ///       a particular property that is not supported by this class.
   params.addPrivateParam("print_unsupported_prop_names", true);
+  params.addParam<bool>("print_automatic_aux_variable_creation",
+                        true,
+                        "Flag to print list of aux variables created for automatic output by "
+                        "MaterialOutputAction.");
   return params;
 }
 
@@ -189,7 +195,8 @@ MaterialOutputAction::act()
                    " to restrict the material properties to output");
       _problem->addAuxVariable("MooseVariableConstMonomial", var_name, params);
     }
-    if (material_names.size() > 0)
+
+    if (material_names.size() > 0 && getParam<bool>("print_automatic_aux_variable_creation"))
       _console << COLOR_CYAN << "The following total " << material_names.size()
                << " aux variables:" << oss.str() << "\nare added for automatic output by " << type()
                << "." << COLOR_DEFAULT << std::endl;

framework/src/base/Moose.C

@@ -565,6 +565,7 @@ associateSyntaxInner(Syntax & syntax, ActionFactory & /*action_factory*/)
 
   registerSyntax("AddOutputAction", "Outputs/*");
   registerSyntax("CommonOutputAction", "Outputs");
+  registerSyntax("MaterialOutputAction", "Outputs");
   registerSyntax("AutoCheckpointAction", "Outputs");
   syntax.registerSyntaxType("Outputs/*", "OutputName");
 

test/tests/materials/output/tests

@@ -123,4 +123,13 @@
     requirement = "The system shall show the field variable names for outputting material data added by materials."
     prereq = warn_unsupported_types
   []
+  [dont_show_added_aux_vars]
+    type = RunApp
+    input = output_warning.i
+    cli_args = Outputs/print_automatic_aux_variable_creation=false
+    allow_warnings = true
+    absent_out = "The following total 145 aux variables:"
+    requirement = "The system shall be able to not show the field variable names for outputting material data added by materials."
+    prereq = show_added_aux_vars
+  []
 []