DPL: introduce Lifetime::Sporadic as alias to Lifetime::QA (#7400)

Author: ktf

Framework/Core/include/Framework/Lifetime.h

@@ -17,29 +17,32 @@ namespace o2::framework
 /// Possible Lifetime of objects being exchanged by the DPL.
 enum struct Lifetime {
   /// A message which is associated to a timeframe. DPL will wait indefinitely for it by default.
-  Timeframe,
+  Timeframe = 0,
   /// Eventually a message whose content is retrieved from CCDB
-  Condition,
-  /// Do not use for now
-  QA,
+  Condition = 1,
+  /// To be used when data is not produced for every timeframe but
+  /// it can be result of a sampling process (like in the case of
+  /// QC) or an aggregating one (like in the case of analysis histograms).
+  QA = 2,
+  Sporadic = 2,
   /// Do not use for now.
-  Transient,
+  Transient = 3,
   /// A message which is created whenever a Timer expires
-  Timer,
+  Timer = 4,
   /// A message which is created immediately, with payload / containing a
   /// single value which gets incremented for every / invokation.
-  Enumeration,
+  Enumeration = 5,
   /// A message which is created every time a SIGUSR1 is received.
-  Signal,
+  Signal = 6,
   /// An optional message. When data arrives, if not already part of the data,
   /// a dummy entry will be generated.
   /// This comes handy e.g. to handle Raw Data, since DataDistribution will provide
   /// everything in one go so whatever is expected but not there, for whatever reason
   /// will be substituted with a dummy entry.
-  Optional,
+  Optional = 7,
   /// An input which is materialised with the contents of some out of band
   /// FairMQ channel.
-  OutOfBand
+  OutOfBand = 8
 };
 
 } // namespace o2::framework