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fix: Update observability documentation to clarify resource attributes and scraping strategy

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Marc Schäfer
2025-10-07 18:45:02 +02:00
parent a86b14d97d
commit 427ab67bb5
1 changed files with 6 additions and 2 deletions
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8
docs/observability.md
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@@ -35,7 +35,8 @@ Runtime behavior
Metric catalog (initial)
- newt_site_registrations_total (counter) labels: result, region (optional); site_id is a resource attribute
- newt_build_info (gauge) labels: version, commit; value is always 1
- newt_site_registrations_total (counter) labels: result; site_id and region are resource attributes
- newt_site_online (observable gauge) no labels (0/1)
- newt_site_last_heartbeat_seconds (observable gauge) no labels
- newt_tunnel_sessions (observable gauge) labels: tunnel_id, transport
@@ -101,6 +102,9 @@ OTEL_EXPORTER_OTLP_HEADERS="Authorization=Bearer abc123,tenant=acme" \
```
Prometheus scrape strategy (choose one)
Important: Do not scrape both Newt (2112) and the Collector’s Prometheus exporter (8889) at the same time for the same process. Doing so will double-count cumulative counters.
A) Scrape Newt directly:
```
@@ -157,7 +161,7 @@ sum(newt_tunnel_sessions)
Compatibility notes
- Gauges do not use the _total suffix (e.g., newt_tunnel_sessions).
- site_id is a resource attribute (one process = one site). tunnel_id is a metric label (WireGuard public key). Never expose secrets in labels.
- site_id and region are resource attributes (one process = one site). Only non-empty resource attributes are exported. tunnel_id is a metric label (WireGuard public key). Never expose secrets in labels.
- Avoid double-scraping: scrape either Newt (/metrics) or the Collector's Prometheus exporter, not both.
- Prometheus does not accept remote_write; use Mimir/Cortex/VM/Thanos-Receive for remote_write.
- No free text in labels; use only the enumerated constants for reason and protocol.