By default IRIS listens on all interfaces.

Are you able to access SMP from a remote machine?

FYI InterSystems IRIS can generate QRCodes natively with %SYS.QRCode class.

Calling @Thomas Nitzsche 
 

I think chart by the error origin would be interesting.

Looks like there's some issues with InterSystems IRIS accessing Java Gateway.

Are there some additional Details available in audit log?

Here's a sample implementation of Kafka Producer via PEX Java BO.

You can use this class to produce XLSX from SQL.

You can also use %Display/%DisplayFormatted methods to change how things are presented.

Great!

Link to OpenExchange does not work.

Good list.

Check InterSystems IRIS upgrade brief.

Python Gateway - invoke Python code snippets for your analytics and machine-learning related tasks

Are there any docs or guides on that feature?

You can easily add your own compile-time check via method generators. Here's an example which checks that all abastract methods are implemented.

Class Test.AbstractChecker
{

ClassMethod Check() As %Status [ CodeMode = objectgenerator, ForceGenerate ]
{
    #Dim sc As %Status = $$$OK
    
    // Get class name from %compiledclass object which is an instance of a currently compiled class
    Set class = %compiledclass.Name

    // Iterate over class methods.
    // You can also use %class object to iterate
    Set method=$$$comMemberNext(class, $$$cCLASSmethod, "")
    While method'="" {
        
        // Get mthod abstract state
        Set abstract = $$$comMemberKeyGet(class, $$$cCLASSmethod, method, $$$cMETHabstract)
        
        // Quit iteration when we find any abstract compiled method
        If abstract {
            set origin = $$$comMemberKeyGet(class, $$$cCLASSmethod, method, $$$cMETHorigin)
            Set sc = $$$ERROR($$$GeneralError, $$$FormatText("Abstract method %1 in class %2 not implemented (origins from %3)", method, class, origin))
            Quit
        }
        
        // Get next method
        Set method=$$$comMemberNext(class, $$$cCLASSmethod, method)        
    }
    Quit sc
}

}

After adding this class to inheritance I get an error on compilation:

DataGrip works.

How do I reference parent from child if parent id is composite?

Here's my global:

^data("idA", "idB") = "Parent"
^data("idA", "idB", 1) = "Child"

And Class is:

Class Parent {
Property IdAProp;
Property IdBProp;
}

SQL Storage for Parent works.

For Child I have tried:

<Subscript name="1">
<Expression>{User.Parent.IdAProp}</Expression>
</Subscript>
<Subscript name="2">
<Expression>{User.Parent.IdBProp}</Expression>
</Subscript>
<Subscript name="3">
<Expression>{Position}</Expression>
</Subscript>

But compilation fails with:

ERROR #5547: Map: Map1 - Subscript Expression - invalid expression '{User.Parent.IdAProp}'.  Must be a valid field reference.    If this is the Master Map, it must be an IDKEY field.
  > ERROR #5030: An error occurred while compiling class 'User.Children'

UPD. SQL schema name should be used, not class.

Check out this series of articles on the topic of mapping globals to classes.

Class SerialA Extends (%SerialObject, %XML.Adaptor) [ ProcedureBlock ]
{
      Property SerialB as SerialB;
     Property SerialC as SerialC(XMLPROJECTION = "NONE");
}