Add point_writes_total and range_writes_total

ConflictSet.cpp

@@ -3194,6 +3194,8 @@ struct __attribute__((visibility("hidden"))) ConflictSet::Impl {
     }
 
     double write_byte_accum = 0;
+    int point_writes_accum = 0;
+    int range_writes_accum = 0;
     for (int i = 0; i < count; ++i) {
       const auto &w = writes[i];
       write_byte_accum += w.begin.len + w.end.len;
@@ -3201,15 +3203,19 @@ struct __attribute__((visibility("hidden"))) ConflictSet::Impl {
       auto end = std::span<const uint8_t>(w.end.p, w.end.len);
       if (w.end.len > 0) {
         keyUpdates += 3;
+        ++range_writes_accum;
         addWriteRange(root, begin, end, InternalVersionT(writeVersion), &tls,
                       this);
       } else {
         keyUpdates += 2;
+        ++point_writes_accum;
         addPointWrite(root, begin, InternalVersionT(writeVersion), &tls, this);
       }
     }
 
     memory_bytes.set(totalBytes);
+    point_writes_total.add(point_writes_accum);
+    range_writes_total.add(range_writes_accum);
     nodes_allocated_total.add(std::exchange(tls.nodes_allocated_accum, 0));
     nodes_released_total.add(std::exchange(tls.nodes_released_accum, 0));
     entries_inserted_total.add(std::exchange(tls.entries_inserted_accum, 0));
@@ -3403,13 +3409,18 @@ struct __attribute__((visibility("hidden"))) ConflictSet::Impl {
   COUNTER(too_olds_total,
           "Total number of checks where the result is \"too old\"");
   COUNTER(check_bytes_total, "Total number of key bytes checked");
+  COUNTER(point_writes_total, "Total number of point writes");
+  COUNTER(range_writes_total,
+          "Total number of range writes (includes prefix writes)");
   GAUGE(memory_bytes, "Total number of bytes in use");
   COUNTER(nodes_allocated_total,
           "The total number of physical tree nodes allocated");
   COUNTER(nodes_released_total,
           "The total number of physical tree nodes released");
   COUNTER(insert_iterations_total,
-          "The total number of iterations of the main loop for insertion");
+          "The total number of iterations of the main loop for insertion. "
+          "Includes searches where the entry already existed, and so insertion "
+          "did not take place");
   COUNTER(entries_inserted_total,
           "The total number of entries inserted in the tree");
   COUNTER(entries_erased_total,