 
         debug "revision info for stack #{stack.title}", status
         if not _revisionStatus or _revisionStatus.status isnt status
+          debug 'checkStackRevisions stack changed!', stack
           @emit 'StackRevisionChecked', stack
 
 

    for stackTemplateId in stackTemplates
      existentStacks = @storage.stacks.query 'baseStackId', stackTemplateId
      existents += existentStacks.length

    if existents isnt stackTemplates.length
    then @emit 'GroupStacksInconsistent'

      # get current revision status for comparison
      { _revisionStatus } = stack

      debug 'checkStackRevisions currentRevision:', _revisionStatus

      # check revision from JComputeStack.checkRevision
      stack.checkRevision (error, data) =>

        debug 'checkStackRevisions checkRevision result', error, data

        data ?= {}
        { status, machineCount } = data
