Adding per block metrics to dashboard

[ndr-ds]

Motivation

New per-block metrics need corresponding dashboard panels.

Proposal

Add Grafana dashboard panels for:

• Operations per block
• Bundles per block
• Transactions per block

Test Plan

• Import updated dashboard
• Verify panels render correctly
• Check data accuracy

Release Plan

• Nothing to do / These changes follow the usual release cycle.

[ndr-ds]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• Move download_sender_certificates_for_receiver to proxy #5128 : 2 dependent PRs (#5131 , #5158 )
• Send notifications from the proxy in batches #5129
• Cache deserialized immutable data on storage #5141
• Use quick_cache on ValueCache and introduce ParkingCache #5130
• RocksDB config tuning #5122
• Adding per block metrics to dashboard #5137 👈 (View in Graphite)
• Add metrics to track operations/bundles/transactions per block #5136
• Several dashboard changes #5124
• Send notifications in batches #5054
• Several metrics changes #5123
• Make notification and cross chain queue sizes grow with network size #5053
• Add node local DNS cache #5050
• Add Otel collector to our tracing exports to Tempo #5049
• Limit max pending message bundles in benchmarks #5121
• Properly set proxy and shard resources #5120
• Make tempo an actual chart dependency #5051 : 1 other dependent PR (#5052 )
• Combine building binaries into 1 cargo build command #5125
• main

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[deuszx]

Maybe we should track dashboards in a separate repo? Actually, I'd put all "infra" code somewhere else.