Adding upstream version 2.4.0.upstream/2.4.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# Operators <a id="operators">
+
+Every Business Process requires an Operator. This operator defines its behaviour and specifies how its very own state is
+going to be calculated.
+
+## AND <a id="and-operator">
+
+The `AND` operator selects the **WORST** state of its child nodes:
+
+![And Operator](screenshot/09_operators/0901_and-operator.png)
+
+## OR <a id="or-operator">
+
+The `OR` operator selects the **BEST** state of its child nodes:
+
+![Or Operator](screenshot/09_operators/0902_or-operator.png)
+
+![Or Operator #2](screenshot/09_operators/0903_or-operator-without-ok.png)
+
+## DEGRADED <a id="deg-operator">
+
+The `DEGRADED` operator behaves like an `AND`, but if the resulting
+state is **CRITICAL** it transforms it into a **WARNING**.
+Refer to the table below for the case-by-case
+analysis of the statuses.
+
+![Degraded Operator](screenshot/09_operators/0905_deg-operator.jpg)
+
+## MIN n <a id="min-operator">
+
+The `MIN` operator selects the **WORST** state out of the **BEST n** child node states:
+
+![MIN](screenshot/09_operators/0904_min-operator.png)