Replace established atom required fields with optional

Bug: 241788170
Original change: https://android-review.googlesource.com/c/platform/frameworks/proto_logging/+/2194538

Change-Id: Ibabbded8122803c34d9e75b0d305e7a5f1b7deea
(cherry picked from commit dfd345b0675dc64de5b749e463f9eab31053078c)
Merged-In: Ibabbded8122803c34d9e75b0d305e7a5f1b7deea
(cherry picked from commit a5ad663395a9c74483c666ee00578eb7b812af22)
Merged-In: Ibabbded8122803c34d9e75b0d305e7a5f1b7deea
1 file changed
tree: 7247885dfc5d8c010afd881b0c47c51f6eec5a1b
  1. stats/
  2. OWNERS