feat(telemetry): map INFORGE cloud/host resource attributes (ADR-0030)

[pedromvgomes]

Summary

Consumer side of inforge ADR-0030 / inforge PR #148 (wardnet/inforge#148). The producer side now injects four new INFORGE_* env vars into every service; this wires them into the cloud-side OTLP Resource (crates/common/src/telemetry.rs) so the attributes actually land on metrics, traces, and logs in Grafana Cloud.

New mappings added alongside the existing identity-attribute rows in resource():

env var	resource attribute	value (Hetzner)
INFORGE_HOST_TYPE	host.type	server-type SKU (e.g. cx23)
INFORGE_CLOUD_PROVIDER	cloud.provider	hetzner
INFORGE_CLOUD_REGION	cloud.region	Hetzner network_zone
INFORGE_CLOUD_AVAILABILITY_ZONE	cloud.availability_zone	Hetzner location

These let Grafana Cloud queries slice app telemetry by cloud region / AZ / machine-type, and they match the resource attributes inforge's host VM-metrics collector (ADR-0031) stamps — so host metrics and app telemetry correlate on host.id.

Safe to merge independently

Each mapping is best-effort: a missing or empty env var is simply omitted (same pattern as the existing service.* / host.id / deployment.* / region rows). The change is therefore inert until inforge actually emits the new INFORGE_* vars, so it can merge ahead of, or independently of, inforge PR #148.

Tests

• Extended resource_carries_the_inforge_identity_attributes to set the four new vars and assert the mapped attributes (with matching remove_var cleanup).
• cargo test -p wardnet_common --lib telemetry → 6 passed.
• cargo fmt -p wardnet_common --check clean; cargo clippy -p wardnet_common clean.

Merge Commit Message

feat(telemetry): map INFORGE cloud/host resource attributes (ADR-0030)

Wire the four new INFORGE_* env vars from inforge (ADR-0030 / PR #148) into the
OTLP resource so cloud/host attributes appear on every metric, trace, and log:
host.type, cloud.provider, cloud.region, cloud.availability_zone. Each mapping
is best-effort (a missing/empty var is omitted), matching the existing identity
rows, so the change is inert until inforge emits the vars and can merge
independently of the producer side.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

📢 Thoughts on this report? Let us know!