Clean up TODOs in statsd

+ Created bugs for those TODOs that are still relevant.
+ Remove obsolete TODOs.

Test: no code change.
Change-Id: I41c2a89a882f087817ee6cbc3f095e1d80e1928e
diff --git a/cmds/statsd/src/FieldValue.h b/cmds/statsd/src/FieldValue.h
index 02c49b9..b1d6ab3 100644
--- a/cmds/statsd/src/FieldValue.h
+++ b/cmds/statsd/src/FieldValue.h
@@ -212,7 +212,7 @@
  * the result is equal to the Matcher Field. That's a bit wise AND operation + check if 2 ints are
  * equal. Nothing can beat the performance of this matching algorithm.
  *
- * TODO: ADD EXAMPLE HERE.
+ * TODO(b/110561213): ADD EXAMPLE HERE.
  */
 struct Matcher {
     Matcher(const Field& matcher, int32_t mask) : mMatcher(matcher), mMask(mask){};