const google.golang.org/grpc/internal/transport.defaultPingTimeout

2 uses

	google.golang.org/grpc/internal/transport (current package)
		http2_server.go#L690: 	defaultPingTimeout = 2 * time.Hour
		http2_server.go#L726: 		if t.lastPingAt.Add(defaultPingTimeout).After(now) {

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