Add a comment about clat bpf stat lifetime

Bug: 335125325
Test: N/A, comment only
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I091b25fb86af9643e9734d42bb03b561f1446431
diff --git a/service/src/com/android/server/connectivity/ClatCoordinator.java b/service/src/com/android/server/connectivity/ClatCoordinator.java
index eea16bf..aec4f24 100644
--- a/service/src/com/android/server/connectivity/ClatCoordinator.java
+++ b/service/src/com/android/server/connectivity/ClatCoordinator.java
@@ -399,6 +399,10 @@
         mCookieTagMap = mDeps.getBpfCookieTagMap();
     }
 
+    // Note that this may only be called on a brand new v4-* interface,
+    // because it uses bpfmap.insertEntry() which fails if entry exists,
+    // and because the value includes (initialized to 0) byte/packet
+    // counters, so a replace (instead of insert) would wipe those stats.
     private void maybeStartBpf(final ClatdTracker tracker) {
         if (mIngressMap == null || mEgressMap == null) return;