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[http2] Add experiment to modify behavior of GRPC_ARG_HTTP2_MAX_PINGS…
…_WITHOUT_DATA to throttle pings instead of blocking (#36374) Implements grpc/proposal#429 Currently, the behavior of `GRPC_ARG_HTTP2_MAX_PINGS_WITHOUT_DATA` blocks more pings from being sent if we are sending too many pings without a data/header frame being sent as well. The original intention of this channel arg was to play nice with proxies that have restrictive settings when it comes to pings. This causes awkwardness when configuring keepalive pings for transports with long lived streams with sparse communication. In such a case, gRPC Core would stop sending keepalive pings since no data/header frame is being sent, resulting in a situation where we are unable to detect whether the transport is alive or not. This change adds an experiment "max_pings_wo_data_throttle" to modify the behavior of `GRPC_ARG_HTTP2_MAX_PINGS_WITHOUT_DATA` to throttle pings to a frequency of 1 minute instead of completely blocking pings when too many pings have been sent without data/header frames. Closes #36374 COPYBARA_INTEGRATE_REVIEW=#36374 from yashykt:ThrottlePings b5bd42a PiperOrigin-RevId: 638110795
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