near_network_routed_msg_hops metric not properly collected

[saketh-are]

This metric is supposed to produce counts of received network messages, bucketed by the message type as well as the number of hops traversed by the message.

nearcore/chain/network/src/stats/metrics.rs

Lines 425 to 439 in 27b518a

	// The routed message reached its destination. If the number of hops is known, then update the
	// corresponding metric.
	fn record_routed_msg_hops(msg: &RoutedMessageV2) {
	const MAX_NUM_HOPS: i32 = 20;
	// We assume that the number of hops is small.
	// As long as the number of hops is below 10, this metric will not consume too much memory.
	if let Some(num_hops) = msg.num_hops {
	if num_hops >= 0 {
	let num_hops = if num_hops > MAX_NUM_HOPS { MAX_NUM_HOPS } else { num_hops };
	NETWORK_ROUTED_MSG_NUM_HOPS
	.with_label_values(&[msg.body_variant(), &num_hops.to_string()])
	.inc();
	}
	}
	}

Upon inspecting data from all mainnet nodes over the past 1 month, I only see results with hops = 0. It does not seem like we are collecting this metric correctly.