fix(spectre): remove duplicate metrics service causing double scrape

[devkoriel]

Summary

• Removes service-metrics.yaml which created a duplicate Service (spectre-metrics) targeting the same pods as the main spectre Service
• Both services exposed port 9090 with identical selector labels, causing the ServiceMonitor to discover two endpoints and produce two identical scrape jobs (spectre and spectre-metrics)
• Adds metrics port (9090) to default service.ports in values.yaml so the main service always exposes the metrics endpoint
• Adds metricRelabelings support to the ServiceMonitor template
• Bumps chart version 0.3.4 → 0.3.5

Impact

• 38,736 duplicate series eliminated — spectre-metrics was an exact copy of spectre
• No dashboards or alerts reference the spectre-metrics job name (all use spectre)
• Existing deployments that override service.ports to include metrics (e.g. prod-relay-appset) are unaffected
• Deployments using default service.ports now get the metrics port from the main service instead of the removed service-metrics service

Changes

File	Change
charts/spectre/templates/service-metrics.yaml	Removed — duplicate service
charts/spectre/values.yaml	Add metrics: {port: 9090} to default service.ports, add metricRelabelings: []
charts/spectre/templates/servicemonitor.yaml	Add metricRelabelings block (gated on non-empty)
charts/spectre/Chart.yaml	Version bump 0.3.4 → 0.3.5

Downstream

• chronicleprotocol/app-of-apps (pending): bumps to 0.3.5, adds metricRelabelings to drop libp2p_holepunch_address_outcomes_total

Test plan

• helm template produces one Service with metrics port (not two)
• helm template renders ServiceMonitor without metricRelabelings when empty
• helm template renders ServiceMonitor with metricRelabelings when values set
• Chart lints cleanly

[devkoriel]

Downstream PR: chronicleprotocol/app-of-apps#1067 (consumes chart 0.3.5, adds metricRelabelings for holepunch metric)

[WesleyCharlesBlake]

just need to figure out why its failing here https://github.com/chronicleprotocol/charts/actions/runs/21892153998/job/63200110770?pr=275#step:9:50

could be issues with exposing metrics

[devkoriel]

just need to figure out why its failing here https://github.com/chronicleprotocol/charts/actions/runs/21892153998/job/63200110770?pr=275#step:9:50

could be issues with exposing metrics

Fixed and will deploy!