There is rarely a need to modify web application config in production.

I just restart webserver/Cache when I encounter problems after web application configuration changes. It often helps.

Sure. To see deprecated classes for some version execute this query against it:

SELECT ID, Description FROM %Dictionary.ClassDefinition WHERE LOWER(Description) [ 'deprecated'

To see deprecated methods execute this query:

SELECT parent AS "Class", Name AS "Method", Description 
FROM %Dictionary.MethodDefinition 
WHERE LOWER(Description) [ 'deprecated'

And to see deprecated properties execute this query:

SELECT parent AS "Class", Name AS "Method", Description
FROM %Dictionary.PropertyDefinition 
WHERE LOWER(Description) [ 'deprecated'

Note, that this queries only return classes/methods/properties which contain "deprecated" in their definition. To catch deprecated inherited classes/methods/properties query %Dictionary.CompiledClass/%Dictionary.CompiledMethod/%Dictionary.CompiledProperty instead.

Hello.

How can I get/set pool size value for a Production item programmatically?  I can't find it in a "Settings Defaults" list.

Use $System.OBJ.Compile("class").

Here's Git  integration for studio.

Could you please tell what do you want to achieve with making 'Open as read-only' setting default?

Okay.

Please note, that only legacy IF sets $TEST and it is also one line long. New IF {} (3 lines, with brackets) does not set a $TEST variable.

Consider adding links to cache documentation from the page that describes the issue, we now have version agnostic urls even. For example this issue could use a link to documentation.

Another question is: what's wrong with postconditionals? They exist not only in caché objectscript and in fact very useful as they allow elimination of all 3 lines blocks with one if condition and one action to execute if if is true. Can I disable an issue type for a project?

Sure. You could use %CELLZERO instead:

WITH  MEMBER [MEASURES].[Revenue as Percent of Total] AS 'Measures.[Amount Sold] / %MDX("select Measures.[Amount sold] on 1 
from holefoods","%CONTEXT","filters|columns")',FORMAT_STRING='##.##%;;;;' 
MEMBER [MEASURES].[Revenue Percent Cumulative] AS 'Measures.[Revenue as Percent of Total] + %CELLZERO(0,-1)',
FORMAT_STRING='##.##%;;;;' SELECT {[Measures].[Amount Sold],[MEASURES].[REVENUE PERCENT CUMULATIVE]} ON 0,
NON EMPTY ORDER([Product].[P1].[Product Category].Members,Measures.[Amount Sold],BDESC) ON 1 FROM [HoleFoods] 

Jokes aside, why do you  need to remove %CELL usage?

There is also this way:

set p = ##class(%ZEN.proxyObject).%New()
set p.a = 1
set p.b = 2
do p.%ToJSON()
kill p.%data("b")
do p.%ToJSON()

kill p.%data("b") would completely remove b property. But better use Caché 2016.1 with native JSON support.

Another queue processing sample is now available in this GitHub repository, courtesy of Vladimir Prushkovskiy.

I assume that's a comment  to my answer?

If yes, here's the working code. Maybe I missed some changes in my answer. Because, again, I needed to do too much changes to run the code in the first place.

I made the following changes:

1.  Changed

Set mimePart.ContentType = "application/pdf"

to

Set mimePart.ContentType = "application/x-object"

2. Commented out:

Do mimeMsg.SetHeader("Content-Disposition","attachment; name=""Files1""; filename="""_docName_"""")          
Set mimeMsg.ContentTransferEncoding = "base64"

3. Uncommented:

 //Set req.ContentType = "multipart/form-data;boundary=" _mimeMsg.Boundary

After these change I received non-empty files object.

 "files": {
              "uploadedfile": "cd \\\r\n@echo start >> date.txt\r\n"
          }

Howether. Here's some tips on how to ask questions like these (with not working code samples):

1.  It must run everywhere. Remove the calls to other code (hardcode values if needed), like:

##class(HData.SiteSettings).GetFaxLogin()

2. Remove unused arguments, like coverpath

3. Remove non essential code like:

Set req.SSLConfiguration = "CardChoice"
Do req.InsertFormData("Username",##class(HData.SiteSettings).GetFaxLogin())
Do req.InsertFormData("Password",##class(HData.SiteSettings).GetFaxPassword())
Do req.InsertFormData("ProductId",##class(HData.SiteSettings).GetFaxProductId())
Do req.InsertFormData("cookies","false")
Do req.InsertFormData("header","header")

//Create job name for fax
Set sendDate = +$H
Set sendTime = $P($ZTIMESTAMP,",",2)+(15*60)
Set schedDate = $ZDATETIME(sendDate_","_sendTime,1,4)
Set schedDate = $E(schedDate,1,16)_" "_$E(schedDate,17,18)
Set docList = $LFS(docpath,"\")
Set docName = $LISTGET(docList,$LL(docList))
Do req.InsertFormData("JobName",schedDate_docName)
    
//format phone number and set billing code
Set num = $REPLACE(phone,"-","")
Do req.InsertFormData("BillingCode",num)
Do req.InsertFormData("Numbers1",num)
   
    
//get notification email
Set email = ##class(HData.SiteSettings).GetFaxNotifyEmail()
If (email '= "") Do req.InsertFormData("FeedbackEmail",email)

4. Comment out unused and misleading code paths like

Set base64 = ##class(%SYSTEM.Encryption).Base64Encode(docStream)
Set mimeMsg.ContentTransferEncoding = "base64"

5. Provide a GitHub Gist snippet of an xml file (with the code) to import and write how to run it.

Your goal, is to make it extremely easy for everyone to take a look at your snippet. All the process must consist of these two steps:

1. Drag&Drop xml file into Studio
2. Copy&Paste a line into a terminal