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6de5b01e04
The Tailscale CLI has some methods to watch the IPN bus for messages, say, the current netmap (`tailscale debug netmap`). The Tailscale daemon supports this using a streaming HTTP response. Sometimes, the client can close its connection abruptly -- due to an interruption, or in the case of `debug netmap`, intentionally after consuming one message. If the server daemon is writing a response as the client closes its end of the socket, the daemon typically encounters a "broken pipe" error. The "Watch IPN Bus" handler currently logs such errors after they're propagated by a JSON encoding/writer helper. Since the Tailscale CLI nominally closes its socket with the daemon in this slightly ungraceful way (viz. `debug netmap`), stop logging these broken pipe errors as far as possible. This will help avoid confounding users when they scan backend logs. Updates #18477 Signed-off-by: Amal Bansode <amal@tailscale.com>