Improve `missing packet data` monitoring

[ljoss17]

Summary

Hermes currently logs warnings when it fails to query the packet data needed to relay a transaction. However, these warnings can be misleading—for instance, if packet clearing happens simultaneously, one worker might fail to retrieve the data and produce an inaccurate warning. Logs can also be easily overlooked, indicating the need for a more persistent approach.

Proposal

Adding metrics

Introduce a new metric that tracks packet data queries which fail repeatedly or over a prolonged period. This would help distinguish transient errors—such as when a packet is relayed during the query—from genuine, long-standing issues that require attention.

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