JEP-0011: Metrics, Tracing, and Log Observability

[mangelajo]

Summary

• Adds JEP-0011 proposing an optional, cross-component observability model for Jumpstarter.
• Covers lease context metadata, structured operational events (annotated logs), exporter/driver metrics, and standardized logging.
• Targets direct integration with Prometheus (scrape), Loki (log aggregation), and Perses (dashboards) without mandating OpenTelemetry.
• Introduces an optional in-cluster Jumpstarter Telemetry service so edge processes never need Loki or cluster-scrape credentials.
• Includes 10 design decisions (DD-1 through DD-10) covering metadata storage, event format, metrics path, log format, credential isolation, OTel stance, Telemetry deployment, HA, idempotency, and dashboarding.

Test plan

• Review JEP content for technical accuracy and completeness
• Verify all DD cross-references resolve correctly
• Confirm Mermaid diagrams render in GitHub markdown preview
• Community discussion on design decisions

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