refactor(metrics): rename crate from torrust-tracker-metrics to torrust-metrics

[josecelano]

Closes #1819. Subissue SI-08 of EPIC #1669.

Summary

Rename the Cargo crate torrust-tracker-metrics to torrust-metrics to reflect that it is
a generic Prometheus metrics integration reusable outside the tracker.

The crate is not published on crates.io, so no migration window is needed.

Changes

• packages/metrics/Cargo.toml: name changed to torrust-metrics.
• 7 dependent Cargo.toml files: dependency key updated to torrust-metrics.
• 34+ Rust source files: all torrust_tracker_metrics:: references updated to torrust_metrics::.
• packages/metrics/README.md: title, description, use statements, docs.rs links, and coverage commands updated.
• AGENTS.md: Package Catalog row updated.
• docs/issues/open/1669-overhaul-packages/EPIC.md: Package Inventory and Desired Package State tables updated; SI-08 marked DONE.

Verification

• cargo build --workspace — ✅
• cargo test --tests --workspace --all-targets --all-features — ✅
• linter all — ✅
• cargo test --doc --workspace — ✅

[Copilot]

Pull request overview

This PR renames the internal metrics crate from torrust-tracker-metrics to torrust-metrics to reflect that it is intended to be reusable beyond the tracker, and updates workspace dependencies, Rust imports, and related documentation accordingly.

Changes:

• Renamed the crate in packages/metrics/Cargo.toml and updated dependent Cargo.toml dependency keys.
• Updated Rust source imports/usages from torrust_tracker_metrics::… to torrust_metrics::… across core, servers, and tests.
• Updated project documentation (README/specs/EPIC/package catalog) to reference the new crate name.

Reviewed changes

Copilot reviewed 47 out of 48 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
packages/udp-tracker-server/src/statistics/repository.rs	Updates metrics crate imports in UDP server statistics repository + tests.
packages/udp-tracker-server/src/statistics/mod.rs	Switches metric description/unit imports to torrust_metrics.
packages/udp-tracker-server/src/statistics/metrics.rs	Switches metrics collection/aggregation imports to torrust_metrics.
packages/udp-tracker-server/src/statistics/event/handler/response_sent.rs	Updates metrics label/metric macro imports for response-sent handler.
packages/udp-tracker-server/src/statistics/event/handler/request_received.rs	Updates metrics imports for request-received handler.
packages/udp-tracker-server/src/statistics/event/handler/request_banned.rs	Updates metrics imports for request-banned handler.
packages/udp-tracker-server/src/statistics/event/handler/request_accepted.rs	Updates metrics imports for request-accepted handler.
packages/udp-tracker-server/src/statistics/event/handler/request_aborted.rs	Updates metrics imports for request-aborted handler.
packages/udp-tracker-server/src/statistics/event/handler/error.rs	Updates metrics imports for error handler.
packages/udp-tracker-server/src/event.rs	Updates label types import used by UDP server events.
packages/udp-tracker-server/src/banning/event/handler.rs	Updates metrics imports used by banning handler.
packages/udp-tracker-server/Cargo.toml	Renames dependency key to torrust-metrics.
packages/udp-tracker-core/src/statistics/repository.rs	Updates metrics crate imports in UDP core statistics repository.
packages/udp-tracker-core/src/statistics/mod.rs	Switches metric description/unit imports to torrust_metrics.
packages/udp-tracker-core/src/statistics/metrics.rs	Switches metrics collection/aggregation imports to torrust_metrics.
packages/udp-tracker-core/src/statistics/event/handler.rs	Updates metrics label/macro imports in UDP core stats event handler.
packages/udp-tracker-core/src/event.rs	Updates label types import used by UDP core events.
packages/udp-tracker-core/Cargo.toml	Renames dependency key to torrust-metrics.
packages/tracker-core/tests/common/test_env.rs	Updates metrics imports used by tracker-core tests.
packages/tracker-core/src/statistics/repository.rs	Updates repository metrics imports to torrust_metrics.
packages/tracker-core/src/statistics/persisted/mod.rs	Updates persisted metrics module imports to torrust_metrics.
packages/tracker-core/src/statistics/mod.rs	Switches metric description/unit imports to torrust_metrics.
packages/tracker-core/src/statistics/metrics.rs	Switches MetricCollection imports to torrust_metrics.
packages/tracker-core/src/statistics/event/handler.rs	Updates metrics imports in stats event handler.
packages/tracker-core/Cargo.toml	Renames dependency key to torrust-metrics.
packages/swarm-coordination-registry/src/statistics/repository.rs	Updates metrics crate imports in swarm coordination registry stats repo.
packages/swarm-coordination-registry/src/statistics/mod.rs	Switches metric description/unit imports to torrust_metrics.
packages/swarm-coordination-registry/src/statistics/metrics.rs	Switches MetricCollection imports to torrust_metrics.
packages/swarm-coordination-registry/src/statistics/event/handler.rs	Updates metrics imports and one fully-qualified error type reference.
packages/swarm-coordination-registry/src/statistics/activity_metrics_updater.rs	Updates metrics imports used by activity updater task.
packages/swarm-coordination-registry/Cargo.toml	Renames dependency key to torrust-metrics.
packages/rest-tracker-api-core/src/statistics/services.rs	Updates MetricCollection import to torrust_metrics.
packages/rest-tracker-api-core/Cargo.toml	Renames dependency key to torrust-metrics.
packages/http-tracker-core/src/statistics/repository.rs	Updates metrics crate imports in HTTP core statistics repository.
packages/http-tracker-core/src/statistics/mod.rs	Switches metric description/unit imports to torrust_metrics.
packages/http-tracker-core/src/statistics/metrics.rs	Switches metrics collection/aggregation imports to torrust_metrics.
packages/http-tracker-core/src/statistics/event/handler.rs	Updates metrics label/macro imports in HTTP core stats handler.
packages/http-tracker-core/src/event.rs	Updates label types import used by HTTP core events.
packages/http-tracker-core/Cargo.toml	Renames dependency key to torrust-metrics.
packages/axum-rest-tracker-api-server/src/v1/context/stats/responses.rs	Updates Prometheus serialization import to torrust_metrics.
packages/axum-rest-tracker-api-server/src/v1/context/stats/resources.rs	Updates MetricCollection import to torrust_metrics.
packages/axum-rest-tracker-api-server/Cargo.toml	Renames dependency key to torrust-metrics.
packages/metrics/Cargo.toml	Renames the metrics crate package name to torrust-metrics.
packages/metrics/README.md	Updates crate name, import paths, docs links, and coverage commands.
docs/issues/open/1819-1669-08-rename-torrust-tracker-metrics-to-torrust-metrics.md	Updates spec metadata and marks implementation tasks/AC as done.
docs/issues/open/1669-overhaul-packages/EPIC.md	Updates package inventory/state tables and marks SI-08 done with #1819.
AGENTS.md	Updates package catalog entry to new crate name.
Cargo.lock	Replaces lockfile package entry from torrust-tracker-metrics to torrust-metrics.

Comments suppressed due to low confidence (2)

packages/metrics/README.md:35

• The usage example pulls DurationSinceUnixEpoch from torrust_tracker_primitives, which is a deprecated re-export (and also undermines the claim that this crate is tracker-agnostic). Prefer importing DurationSinceUnixEpoch from torrust_tracker_clock (or using std::time::Duration if appropriate) in the README example.

use torrust_metrics::{
    metric_collection::MetricCollection,
    label::{LabelSet, LabelValue},
    metric_name, label_name,
};

docs/issues/open/1819-1669-08-rename-torrust-tracker-metrics-to-torrust-metrics.md:12

• last-updated-utc hasn’t been updated even though this spec now includes new 2026-05-21 progress log entries and metadata changes. Please bump last-updated-utc to reflect the latest modification timestamp.

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[josecelano]

ACK 75e57b3

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.70%. Comparing base (f8d3b65) to head (75e57b3).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1820      +/-   ##
===========================================
+ Coverage    77.68%   77.70%   +0.01%     
===========================================
  Files          379      379              
  Lines        28605    28605              
  Branches     28605    28605              
===========================================
+ Hits         22223    22228       +5     
+ Misses        6073     6066       -7     
- Partials       309      311       +2     

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