Reviewer comment

Author: yashykt

test/cpp/ext/otel/otel_test_library.h

@@ -407,13 +407,16 @@ MATCHER_P7(GaugeDataIsIncrementalForSpecificMetricAndLabelSet, metric_name,
   return result;
 }
 
+// Helper matcher to check whether a value is within a certain range
 MATCHER_P2(IsWithinRange, lo, hi,
            absl::StrCat(negation ? "isn't" : "is", " between ",
                         ::testing::PrintToString(lo), " and ",
                         ::testing::PrintToString(hi))) {
   return (lo) <= arg && arg <= (hi);
 }
 
+// Specialization of Extract to be able to use `IsWithinRange` matcher within
+// the `HistogramResultEq` matcher defined above.
 template <typename T>
 struct Extract<const IsWithinRangeMatcherP2<T, T>> {
   using Type = T;