Add OCI Image Fetches Grafana dashboard#11371
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Two panels: 1. OCI Image Fetch Success Ratio - ratio of successful fetches to total fetches per isolation type (0-1 scale). Legend: median, min. 2. OCI Image Fetch Latency (p90) - p90 latency by isolation type for successful fetches. Microseconds converted to seconds. Legend: median, max. Dashboard JSON normalized via process_dashboard.py. Co-authored-by: Shelley <shelley@exe.dev>
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Splitting by registry is also probably interesting, if you wanted to do that in this PR as well
Two new panels: 3. OCI Image Fetch Success Ratio by Registry - ratio of successful fetches to total fetches per upstream registry (eTLD+1). Legend: median, min. 4. OCI Image Fetch Latency (p90) by Registry - p90 latency by upstream registry for successful fetches. Microseconds converted to seconds. Legend: median, max. Co-authored-by: Shelley <shelley@exe.dev>
Panel 5: OCI Image On-Disk Ratio - ratio of image fetch attempts where the image was already cached on the executor, per isolation type. Legend: median, min. 0-100% scale. Co-authored-by: Shelley <shelley@exe.dev>
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Good call! Added two panels breaking out by registry, and also added the ratio of OCI images already present on-disk (broken down by isolation type). 
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The dashboard panels with synthetic data: