per-track metrics: scrape stack, relay-visible dashboard, public variant

[gmarzot]

Wires the dashboard to the per-track series from #533.

• Scrape stack: ns-targets sidecar generates one file_sd target per live namespace (/metrics/track takes one namespace per request); scrapes pass omit_metadata; json-exporter's /state per-track series retired; track_metrics_enabled on in the docker config.
• Overview dashboard: catalog-owned columns removed (no content peeking). Namespace/track selectors scope the tracks table and chart. Real per-track bitrate/data-tx, status pills from last-object age (LIVE/IDLE/DONE), CDN-efficiency gauge, relay uptime from /info. Fetches/latency/drops/cache-hit columns are placeholders for per-track verb counters (subscribes, fetches) #593–fetch cache hit/miss counters #596; QoS reports NORMAL until those land.
• Public variant (moqx-public): public dashboards can't interpolate template variables, so the public view is a separate variable-free dashboard — top-20 tracks grouped per namespace via nested tables.
• Fix: dashboard export archives moved out of the provisioning tree (duplicate uids silently lock the provisioner out of all DB writes).

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This change is 

[gmarzot]

waiting got PR#533 to merge

[afrind]

@afrind reviewed 7 files and all commit messages, and made 3 comments.
Reviewable status: all files reviewed, 3 unresolved discussions (waiting on gmarzot).

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docker/config.docker.yaml line 62 at r1 (raw file):

admin:
  port: ${MOQX_ADMIN_PORT}
  track_metrics_enabled: true

Does this impact perf test?

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docker/prometheus/namespace-targets.py line 71 at r1 (raw file):

def write(path, entries):
    payload = [
        {"targets": [safe_namespace(ns)], "labels": {"moqx_namespace": "/".join(ns)}}

joining on / ? the endpoint assumes - (and -- to demarcate track name)

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docker/prometheus/prometheus.yml line 76 at r1 (raw file):

        replacement: json-exporter:7979

  # Per-track counters from the relay (openmoq/moqx#533). One namespace per

Don't know that referring to pr numbers is useful long term docs

[afrind]

@afrind reviewed 6 files and all commit messages, and resolved 1 discussion.
Reviewable status: all files reviewed, 2 unresolved discussions (waiting on gmarzot).

[gmarzot]

docker/config.docker.yaml line 62 at r1 (raw file):

Previously, afrind wrote…

Does this impact perf test?

no.. different harness

[gmarzot]

docker/prometheus/namespace-targets.py line 71 at r1 (raw file):

Previously, afrind wrote…

joining on / ? the endpoint assumes - (and -- to demarcate track name)

for display only .. real safenames will be used where required

[gmarzot]

@gmarzot reviewed 8 files and all commit messages, and resolved 2 discussions.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on gmarzot).