http_connection_manager_decode_headers to send GOAWAY for H/2

[botengyao]

The current http_connection_manager_decode_headers load shed point is sending 503 local reply when Envoy is under overload, one idea is we can send GO_AWAY for H/2 after decoding header. This will benefit the connection rebalance. One risk probably is to process the existing streams, but we can use a shutdown notice following a GO_AWAY.

cc @KBaichoo, WDYT?

[KBaichoo]

Can you help me understand why / whether: envoy.load_shed_points.http2_server_go_away_on_dispatch doesn't work for your use case?

[github-actions[bot]]

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[github-actions[bot]]

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