make flag to optionally print/suppress aux variable creation printing

framework/src/actions/CommonOutputAction.C

@@ -111,6 +111,11 @@ CommonOutputAction::validParams()
       "A list of the variables and postprocessors that should be output to the Exodus file "
       "(may include Variables, ScalarVariables, and Postprocessor names).");
 
+  params.addParam<bool>("print_automatic_aux_variable_creation",
+                        true,
+                        "Flag to print list of aux variables created for automatic output by "
+                        "MaterialOutputAction.");
+
   // Add the 'execute_on' input parameter
   ExecFlagEnum exec_enum = Output::getDefaultExecFlagEnum();
   exec_enum = {EXEC_INITIAL, EXEC_TIMESTEP_END};

framework/src/actions/MaterialOutputAction.C

@@ -21,6 +21,7 @@
 #include "MooseEnum.h"
 #include "MooseVariableConstMonomial.h"
 #include "FunctorMaterial.h"
+#include "CommonOutputAction.h"
 
 #include "libmesh/utility.h"
 
@@ -189,7 +190,14 @@ MaterialOutputAction::act()
                    " to restrict the material properties to output");
       _problem->addAuxVariable("MooseVariableConstMonomial", var_name, params);
     }
-    if (material_names.size() > 0)
+
+    bool print_aux_creation = true;
+    const auto common_actions = _app.actionWarehouse().getActions<CommonOutputAction>();
+    mooseAssert(common_actions.size() <= 1, "Should not be more than one CommonOutputAction");
+    const Action * common = common_actions.empty() ? nullptr : *common_actions.begin();
+    if (common && !common->getParam<bool>("print_automatic_aux_variable_creation"))
+      print_aux_creation = false;
+    if (material_names.size() > 0 && print_aux_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;

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 not show the field variable names for outputting material data added by materials."
+    prereq = show_added_aux_vars
+  []
 []