DPL: Improve some signpost messages

(cherry picked from commit 2ca79e0)

Author: davidrohr

Framework/Core/src/DataRelayer.cxx

@@ -372,7 +372,7 @@ void DataRelayer::pruneCache(TimesliceSlot slot, OnDropCallback onDrop)
       bool anyDropped = std::any_of(dropped.begin(), dropped.end(), [](auto& m) { return m.size(); });
       if (anyDropped) {
         O2_SIGNPOST_ID_GENERATE(aid, data_relayer);
-        O2_SIGNPOST_EVENT_EMIT(data_relayer, aid, "pruneCache", "Dropping stuff from slot %zu %zu", slot.index, oldestPossibleTimeslice.timeslice.value);
+        O2_SIGNPOST_EVENT_EMIT(data_relayer, aid, "pruneCache", "Dropping stuff from slot %zu with timeslice %zu", slot.index, oldestPossibleTimeslice.timeslice.value);
         onDrop(slot, dropped, oldestPossibleTimeslice);
       }
     }

Framework/Core/src/TimesliceIndex.cxx

@@ -10,6 +10,7 @@
 // or submit itself to any jurisdiction.
 #include "Framework/TimesliceIndex.h"
 #include "Framework/Signpost.h"
+#include <fairmq/Channel.h>
 
 O2_DECLARE_DYNAMIC_LOG(timeslice_index);
 
@@ -162,11 +163,11 @@ TimesliceIndex::OldestInputInfo TimesliceIndex::setOldestPossibleInput(Timeslice
     }
   }
   if (changed && mOldestPossibleInput.timeslice.value != result.timeslice.value) {
-    O2_SIGNPOST_EVENT_EMIT(timeslice_index, tid, "setOldestPossibleInput", "Success: Oldest possible input is %zu due to channel %d",
-                           result.timeslice.value, result.channel.value);
+    O2_SIGNPOST_EVENT_EMIT(timeslice_index, tid, "setOldestPossibleInput", "Success (channel %d): Oldest possible input is %zu due to channel %d",
+                           channel.value, result.timeslice.value, result.channel.value);
   } else if (mOldestPossibleInput.timeslice.value != result.timeslice.value) {
-    O2_SIGNPOST_EVENT_EMIT(timeslice_index, tid, "setOldestPossibleInput", "Oldest possible input updated from timestamp: %zu --> %zu",
-                           mOldestPossibleInput.timeslice.value, result.timeslice.value);
+    O2_SIGNPOST_EVENT_EMIT(timeslice_index, tid, "setOldestPossibleInput", "channel %d: Oldest possible input updated from timestamp: %zu --> %zu",
+                           channel.value, mOldestPossibleInput.timeslice.value, result.timeslice.value);
   } else {
     O2_SIGNPOST_EVENT_EMIT(timeslice_index, tid, "setOldestPossibleInput", "No change in oldest possible input");
   }