Add node local DNS cache

[ndr-ds]

Motivation

CoreDNS can become a bottleneck with high DNS query volume. NodeLocal DNSCache reduces latency and load by caching
DNS responses on each node.

Proposal

Add Kubernetes templates for NodeLocal DNSCache:

• DaemonSet template for the DNS cache pods
• ConfigMap for DNS configuration
• Service for the cache endpoint

Test Plan

• Deploy the DNS cache infrastructure
• Verify DNS resolution works correctly
• Measure DNS latency improvement

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.
Learn more

• 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
• 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 👈 (View in Graphite)
• 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]

You wrote:

Measure DNS latency improvement

Did you measure it already? What's the improvement?