{"action":"created","comment":{"url":"https://api.github.com/repos/grpc/grpc/pulls/comments/226053621","pull_request_review_id":165784447,"id":226053621,"node_id":"MDI0OlB1bGxSZXF1ZXN0UmV2aWV3Q29tbWVudDIyNjA1MzYyMQ==","diff_hunk":"@@ -95,7 +95,9 @@ class LoadBalancingPolicy\n   /// Updates the policy with a new set of \\a args from the resolver.\n   /// Note that the LB policy gets the set of addresses from the\n   /// GRPC_ARG_LB_ADDRESSES channel arg.\n-  virtual void UpdateLocked(const grpc_channel_args& args) GRPC_ABSTRACT;\n+  /// Returns true if the update caused the number of backends to go from","path":"src/core/ext/filters/client_channel/lb_policy.h","position":5,"original_position":5,"commit_id":"aa7b8e5bc6b1ce0ea74ae2ac290ebf031b2969e2","original_commit_id":"aa7b8e5bc6b1ce0ea74ae2ac290ebf031b2969e2","user":{"login":"ncteisen","id":6148140,"node_id":"MDQ6VXNlcjYxNDgxNDA=","avatar_url":"https://avatars1.githubusercontent.com/u/6148140?v=4","gravatar_id":"","url":"https://api.github.com/users/ncteisen","html_url":"https://github.com/ncteisen","followers_url":"https://api.github.com/users/ncteisen/followers","following_url":"https://api.github.com/users/ncteisen/following{/other_user}","gists_url":"https://api.github.com/users/ncteisen/gists{/gist_id}","starred_url":"https://api.github.com/users/ncteisen/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ncteisen/subscriptions","organizations_url":"https://api.github.com/users/ncteisen/orgs","repos_url":"https://api.github.com/users/ncteisen/repos","events_url":"https://api.github.com/users/ncteisen/events{/privacy}","received_events_url":"https://api.github.com/users/ncteisen/received_events","type":"User","site_admin":false},"body":"Actually, I do need to access the old num addresses. Is there a way to accomplish that without adding to LB API? ","created_at":"2018-10-17T18:51:40Z","updated_at":"2018-10-17T18:51:40Z","html_url":"https://github.com/grpc/grpc/pull/16904#discussion_r226053621","pull_request_url":"https://api.github.com/repos/grpc/grpc/pulls/16904","author_association":"CONTRIBUTOR","_links":{"self":{"href":"https://api.github.com/repos/grpc/grpc/pulls/comments/226053621"},"html":{"href":"https://github.com/grpc/grpc/pull/16904#discussion_r226053621"},"pull_request":{"href":"https://api.github.com/repos/grpc/grpc/pulls/16904"}},"in_reply_to_id":225972732},"pull_request":{"url":"https://api.github.com/repos/grpc/grpc/pulls/16904","id":223437471,"node_id":"MDExOlB1bGxSZXF1ZXN0MjIzNDM3NDcx","html_url":"https://github.com/grpc/grpc/pull/16904","diff_url":"https://github.com/grpc/grpc/pull/16904.diff","patch_url":"https://github.com/grpc/grpc/pull/16904.patch","issue_url":"https://api.github.com/repos/grpc/grpc/issues/16904","number":16904,"state":"open","locked":false,"title":"Channel Tracing Name Resolution Support","user":{"login":"ncteisen","id":6148140,"node_id":"MDQ6VXNlcjYxNDgxNDA=","avatar_url":"https://avatars1.githubusercontent.com/u/6148140?v=4","gravatar_id":"","url":"https://api.github.com/users/ncteisen","html_url":"https://github.com/ncteisen","followers_url":"https://api.github.com/users/ncteisen/followers","following_url":"https://api.github.com/users/ncteisen/following{/other_user}","gists_url":"https://api.github.com/users/ncteisen/gists{/gist_id}","starred_url":"https://api.github.com/users/ncteisen/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ncteisen/subscriptions","organizations_url":"https://api.github.com/users/ncteisen/orgs","repos_url":"https://api.github.com/users/ncteisen/repos","events_url":"https://api.github.com/users/ncteisen/events{/privacy}","received_events_url":"https://api.github.com/users/ncteisen/received_events","type":"User","site_admin":false},"body":"This is the beginning of support for resolution. We probably want more information about the addresses, but I figured we could discuss that in PR form.\r\n\r\nHere is example output:\r\n\r\n```\r\n  \"trace\": {\r\n   \"numEventsLogged\": \"6\",\r\n   \"creationTimestamp\": \"2018-10-16T17:43:36.138319624Z\",\r\n   \"events\": [\r\n    {\r\n     \"description\": \"Channel created\",\r\n     \"severity\": \"CT_INFO\",\r\n     \"timestamp\": \"2018-10-16T17:43:36.138319955Z\"\r\n    },\r\n    {\r\n     \"description\": \"Switched LB policy to pick_first\",\r\n     \"severity\": \"CT_INFO\",\r\n     \"timestamp\": \"2018-10-16T17:43:36.138319445Z\"\r\n    },\r\n    {\r\n     \"description\": \"New addresses resolved\",\r\n     \"severity\": \"CT_INFO\",\r\n     \"timestamp\": \"2018-10-16T17:43:36.138319874Z\"\r\n    },\r\n    {\r\n     \"description\": \"Channel state change to IDLE\",\r\n     \"severity\": \"CT_INFO\",\r\n     \"timestamp\": \"2018-10-16T17:43:36.138320212Z\"\r\n    },\r\n    {\r\n     \"description\": \"Channel state change to CONNECTING\",\r\n     \"severity\": \"CT_INFO\",\r\n     \"timestamp\": \"2018-10-16T17:43:36.138319654Z\"\r\n    },\r\n    {\r\n     \"description\": \"Channel state change to READY\",\r\n     \"severity\": \"CT_INFO\",\r\n     \"timestamp\": \"2018-10-16T17:43:36.139320296Z\"\r\n    }\r\n   ]\r\n  }\r\n```\r\n\r\nMy main question is how much data we want to include in the event that now reads \"New addresses resolved\". Should I actually parse through GRPC_ARG_LB_ADDRESSES and format them into a string? Or do you think it would be enough to say \"resolved from zero to non zero\" or vice 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