You have created the metric, now you need to add it to dashboard or Production monitor.

Two ways I know how to add your page:

1. To DeepSee User Portal (from Analyze This):

Set tItem=##class(%DeepSee.UserLibrary.Link).%New()
Set tItem.fullName="Analyze This"
Set tPage="AnalyzeThis.UI.CSVImport.zen"
Set tItem.href=$system.CSP.GetPortalApp($namespace,tPage) _ tPage
Set tItem.title="Analyze This"
Set tSC=tItem.%Save()

2. To Favorites:

set sc = ##class(%SYS.Portal.Users).%AddFavorite("Name", "URL")

Datatype parameters can be set as properties parameters.

In your case you have a property somewhere:

Property myDate %FilemanDate;

You need to modify it like this:

Property myDate %FilemanDate(STRICTDATA=1);

And recompile the class.

Here's a way without indirection:

Class MyPackage.MyClass
{

ClassMethod MyMethod(p1 = 1, p2 = 2, p3 = 3)
{
    Write p1,"-",p2,"-",p3,!
}

/// do ##class(MyPackage.MyClass).Test()
ClassMethod Test()
{
    Do ..FromJson({})
    Do ..FromJson({"p1":"first value", "p2":"second value"})
    Do ..FromJson({"p1":"first value", "p3":"third value"})
    Do ..FromJson({"p2":"second value"})
}

/// do ##class(MyPackage.MyClass).ArgPosMapping("MyPackage.MyClass", "MyMethod")
ClassMethod ArgPosMapping(class, method, Output map)
{
    kill map
    set formalspec = $$$comMemberKeyGet(class,$$$cCLASSmethod,method,$$$cMETHformalspecparsed)
    for i=1:1:$ll(formalspec) {
        set arg = $lg(formalspec, i)
        set map($lg(arg, 1)) =  i
    }
    
    set map = $ll(formalspec)
}

ClassMethod FromJson(json)
{
    Do ..ArgPosMapping($classname(), "MyMethod", .map)
    Set iterator = json.%GetIterator()
    Set position = 0
    While iterator.%GetNext(.key, .value) {
        Set position = position + 1
        Set arguments(map(key)) = value
    }
    
    Set arguments = map

    Do ..MyMethod(arguments...)
}

}

Is it service or operation? Please elaborate on your configuration.

Because you have XML error, I think there are some additional transformation(s) taking place.

Have you tried checking Stream at line 3 offset 120?

Check %SYSTEM.Mirror class, it looks like what you need.

Write class method - sqlprocedure to expose the data you need via xDBC.