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

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

- Rename `name` in `packages/metrics/Cargo.toml` to `torrust-metrics`.
- Update dependency key in 7 dependent `Cargo.toml` files.
- Update all Rust source `torrust_tracker_metrics::` references to `torrust_metrics::`.
- Update prose in `AGENTS.md` and `packages/metrics/README.md` to remove tracker-specific framing.
- Update EPIC torrust#1669 Package Inventory and Desired Package State tables; mark SI-08 DONE.

Author: josecelano

AGENTS.md

@@ -70,7 +70,7 @@ All packages live under `packages/`. The workspace version is `3.0.0-develop`.
 | `http-protocol`                   | `bittorrent-http-tracker-protocol`                | `*-protocol`   | HTTP tracker protocol (BEP 3/23) parsing       |
 | `http-tracker-core`               | `bittorrent-http-tracker-core`                    | `*-core`       | HTTP-specific tracker domain logic             |
 | `located-error`                   | `torrust-tracker-located-error`                   | utilities      | Diagnostic errors with source locations        |
-| `metrics`                         | `torrust-tracker-metrics`                         | domain         | Prometheus metrics integration                 |
+| `metrics`                         | `torrust-metrics`                                 | domain         | Prometheus metrics integration                 |
 | `peer-id`                         | `bittorrent-peer-id`                              | domain         | Peer ID parsing and formatting utilities       |
 | `primitives`                      | `torrust-tracker-primitives`                      | domain         | Core domain types (InfoHash, PeerId, ...)      |
 | `rest-tracker-api-client`         | `torrust-tracker-rest-api-client`                 | client tools   | REST API client library                        |

Cargo.lock

@@ -60,6 +60,7 @@ The workspace currently contains **27 packages** (including the root `torrust-tr
 
 | Published on crates.io | Crate Name               | Folder           |
 | ---------------------- | ------------------------ | ---------------- |
+| No                     | `torrust-metrics`        | `metrics`        |
 | No                     | `torrust-net-primitives` | `net-primitives` |
 | No                     | `torrust-server-lib`     | `server-lib`     |
 
@@ -77,7 +78,6 @@ The workspace currently contains **27 packages** (including the root `torrust-tr
 | Yes                    | `torrust-tracker-contrib-bencode`                 | `contrib/bencode`                 |
 | No                     | `torrust-tracker-events`                          | `events`                          |
 | Yes                    | `torrust-tracker-located-error`                   | `located-error`                   |
-| No                     | `torrust-tracker-metrics`                         | `metrics`                         |
 | Yes                    | `torrust-tracker-primitives`                      | `primitives`                      |
 | No                     | `torrust-tracker-rest-api-client`                 | `rest-tracker-api-client`         |
 | No                     | `torrust-tracker-rest-api-core`                   | `rest-tracker-api-core`           |
@@ -120,7 +120,7 @@ destination group with a "Renamed from …" note.
 | Yes                    | `torrust-clock`          | `clock`          | Renamed from `torrust-tracker-clock`         |
 | Yes                    | `torrust-located-error`  | `located-error`  | Renamed from `torrust-tracker-located-error` |
 | Yes                    | `torrust-net-primitives` | `net-primitives` | New package (created by SI-05)               |
-| No                     | `torrust-metrics`        | `metrics`        | Renamed from `torrust-tracker-metrics`       |
+| No                     | `torrust-metrics`        | `metrics`        | —                                            |
 
 ### `torrust-tracker-` prefix
 
@@ -214,7 +214,7 @@ Status: TODO unless noted. `SI-XX` = recommended implementation sequence number.
 - [x] SI-05 — [#1797](https://github.com/torrust/torrust-tracker/issues/1797) Create `torrust-net-primitives` and move `ServiceBinding` from `torrust-tracker-primitives` _(Rule M + new package; no blockers)_
 - [x] SI-06 — [#1813](https://github.com/torrust/torrust-tracker/issues/1813) Resolve `bittorrent-tracker-core` ↔ `torrust-tracker-rest-api-client` layer violation _(Rule M; prerequisite for `bittorrent-tracker-core` extraction)_
 - [x] SI-07 — [#1816](https://github.com/torrust/torrust-tracker/issues/1816) Align `torrust-` prefix: rename 7 tracker-specific packages to `torrust-tracker-` _(Rule U; no blockers)_
-- [ ] SI-08 — [#1819](https://github.com/torrust/torrust-tracker/issues/1819) Rename `torrust-tracker-metrics` to `torrust-metrics` _(Rule U; no blockers)_
+- [x] SI-08 — [#1819](https://github.com/torrust/torrust-tracker/issues/1819) Rename `torrust-tracker-metrics` to `torrust-metrics` _(Rule U; no blockers)_
 - [ ] SI-09 — Rename `torrust-tracker-clock` to `torrust-clock` _(Rule P; no blockers)_
 - [ ] SI-10 — Rename `torrust-tracker-located-error` to `torrust-located-error` _(Rule P; no blockers)_
 - [ ] SI-11 — Update all package READMEs _(documentation; after SI-07–SI-10; before SI-12)_
@@ -234,7 +234,7 @@ Details:
 | SI-05 | [#1797](https://github.com/torrust/torrust-tracker/issues/1797) — Create `torrust-net-primitives` and move `ServiceBinding` from `torrust-tracker-primitives`                    | [docs/issues/open/1797-1669-05-create-torrust-net-primitives-and-move-service-binding.md](../../open/1797-1669-05-create-torrust-net-primitives-and-move-service-binding.md)         | TODO   | Rule M + new package; generic networking type; breaks server-lib → tracker-primitives dep       |
 | SI-06 | [#1813](https://github.com/torrust/torrust-tracker/issues/1813) — Resolve `bittorrent-tracker-core` ↔ `torrust-tracker-rest-api-client` layer violation                          | [docs/issues/closed/1813-1669-06-resolve-bittorrent-tracker-core-rest-api-layer-violation.md](../../closed/1813-1669-06-resolve-bittorrent-tracker-core-rest-api-layer-violation.md) | DONE   | Rule M; stale unused dev dep removed in PR #1804; unblocks `bittorrent-tracker-core` extraction |
 | SI-07 | [#1816](https://github.com/torrust/torrust-tracker/issues/1816) — Align `torrust-` prefix: rename 7 tracker-specific packages to `torrust-tracker-`                              | [docs/issues/open/1816-1669-07-align-torrust-prefix-rename-tracker-specific-packages.md](../../open/1816-1669-07-align-torrust-prefix-rename-tracker-specific-packages.md)           | DONE   | Rule U; none of the 7 are published; pure workspace rename; no blockers                         |
-| SI-08 | [#1819](https://github.com/torrust/torrust-tracker/issues/1819) — Rename `torrust-tracker-metrics` to `torrust-metrics`                                                             | [docs/issues/open/1819-1669-08-rename-torrust-tracker-metrics-to-torrust-metrics.md](../../open/1819-1669-08-rename-torrust-tracker-metrics-to-torrust-metrics.md)                   | TODO   | Rule U; not yet published; no blockers; prerequisite for SI-14                                  |
+| SI-08 | [#1819](https://github.com/torrust/torrust-tracker/issues/1819) — Rename `torrust-tracker-metrics` to `torrust-metrics`                                                             | [docs/issues/open/1819-1669-08-rename-torrust-tracker-metrics-to-torrust-metrics.md](../../open/1819-1669-08-rename-torrust-tracker-metrics-to-torrust-metrics.md)                   | DONE   | Rule U; not yet published; no blockers; prerequisite for SI-14                                  |
 | SI-09 | #TBD — Rename `torrust-tracker-clock` to `torrust-clock`                                                                                                                         | [docs/issues/drafts/1669-09-rename-torrust-tracker-clock-to-torrust-clock.md](../../drafts/1669-09-rename-torrust-tracker-clock-to-torrust-clock.md)                                 | TODO   | Rule P; published on crates.io; no blockers; prerequisite for SI-13                             |
 | SI-10 | #TBD — Rename `torrust-tracker-located-error` to `torrust-located-error`                                                                                                         | [docs/issues/drafts/1669-10-rename-torrust-tracker-located-error-to-torrust-located-error.md](../../drafts/1669-10-rename-torrust-tracker-located-error-to-torrust-located-error.md) | TODO   | Rule P; published on crates.io; no blockers                                                     |
 | SI-11 | #TBD — Update all package READMEs                                                                                                                                                | [docs/issues/drafts/1669-11-update-all-package-readmes.md](../../drafts/1669-11-update-all-package-readmes.md)                                                                       | TODO   | Documentation; requires SI-07–SI-10; before SI-12                                               |

docs/issues/open/1669-overhaul-packages/EPIC.md

@@ -76,14 +76,14 @@ Status values: `TODO`, `IN_PROGRESS`, `BLOCKED`, `DONE`.
 
 | ID  | Status | Task                                                                                                | Notes / Expected Output                                                                |
 | --- | ------ | --------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------- |
-| T1  | TODO   | Rename `name` in `packages/metrics/Cargo.toml`                                                      | `name = "torrust-metrics"`                                                             |
-| T2  | TODO   | Update root `Cargo.toml` workspace dependency key                                                   | `torrust-metrics = { version = ..., path = "packages/metrics" }`                       |
-| T3  | TODO   | Update all dependent package `Cargo.toml` files (7 packages)                                        | Replace `torrust-tracker-metrics` key with `torrust-metrics`                           |
-| T4  | TODO   | Update Rust source `use` / path references (`torrust_tracker_metrics::` → `torrust_metrics::`)      | Affects package sources and integration tests                                          |
-| T5  | TODO   | Update prose in `packages/AGENTS.md`, `AGENTS.md`, `docs/packages.md`, `packages/metrics/README.md` | Crate name and any inline code snippets                                                |
-| T6  | TODO   | Run `cargo build --workspace` and `cargo test --workspace`                                          | Clean build and all tests pass                                                         |
-| T7  | TODO   | Run `linter all`                                                                                    | Exit code `0`                                                                          |
-| T8  | TODO   | Update EPIC #1669 `Package Inventory` and `Desired Package State` tables                            | Move `torrust-metrics` from `torrust-tracker-` to `torrust-`; drop `Renamed from` note |
+| T1  | DONE   | Rename `name` in `packages/metrics/Cargo.toml`                                                      | `name = "torrust-metrics"`                                                             |
+| T2  | DONE   | Update root `Cargo.toml` workspace dependency key                                                   | `torrust-metrics = { version = ..., path = "packages/metrics" }`                       |
+| T3  | DONE   | Update all dependent package `Cargo.toml` files (7 packages)                                        | Replace `torrust-tracker-metrics` key with `torrust-metrics`                           |
+| T4  | DONE   | Update Rust source `use` / path references (`torrust_tracker_metrics::` → `torrust_metrics::`)      | Affects package sources and integration tests                                          |
+| T5  | DONE   | Update prose in `packages/AGENTS.md`, `AGENTS.md`, `docs/packages.md`, `packages/metrics/README.md` | Crate name and any inline code snippets                                                |
+| T6  | DONE   | Run `cargo build --workspace` and `cargo test --workspace`                                          | Clean build and all tests pass                                                         |
+| T7  | DONE   | Run `linter all`                                                                                    | Exit code `0`                                                                          |
+| T8  | DONE   | Update EPIC #1669 `Package Inventory` and `Desired Package State` tables                            | Move `torrust-metrics` from `torrust-tracker-` to `torrust-`; drop `Renamed from` note |
 
 **Dependent packages to update in T3** (7 files):
 
@@ -103,8 +103,8 @@ Status values: `TODO`, `IN_PROGRESS`, `BLOCKED`, `DONE`.
 - [x] Spec reviewed and approved by user/maintainer
 - [x] GitHub issue created and issue number added to this spec
 - [x] Spec moved to `docs/issues/open/` with issue number prefix
-- [ ] Implementation completed
-- [ ] Automatic verification completed (`linter all`, `cargo test --workspace`)
+- [x] Implementation completed
+- [x] Automatic verification completed (`linter all`, `cargo test --workspace`)
 - [ ] Manual verification scenarios executed and recorded
 - [ ] Acceptance criteria reviewed after implementation and updated with evidence
 - [ ] EPIC #1669 Active Subissues table updated to `DONE`
@@ -114,17 +114,18 @@ Status values: `TODO`, `IN_PROGRESS`, `BLOCKED`, `DONE`.
 
 - 2026-05-15 12:00 UTC - josecelano - Spec drafted as subissue of EPIC #1669
 - 2026-05-21 UTC - josecelano - GitHub issue #1819 created; spec moved to open/
+- 2026-05-21 UTC - josecelano - Implementation complete; build and tests pass; linter all passes
 
 ## Acceptance Criteria
 
-- [ ] `packages/metrics/Cargo.toml` declares `name = "torrust-metrics"`.
-- [ ] No `Cargo.toml` file in the workspace references `torrust-tracker-metrics`.
-- [ ] No Rust source file in the workspace uses `torrust_tracker_metrics::`.
-- [ ] `cargo build --workspace` succeeds with zero errors.
-- [ ] `cargo test --workspace` passes with zero failures.
-- [ ] `linter all` exits with code `0`.
-- [ ] `packages/AGENTS.md`, `AGENTS.md`, `docs/packages.md`, and `packages/metrics/README.md` reflect the new crate name.
-- [ ] EPIC #1669 `Desired Package State` table lists `torrust-metrics` in the `torrust-` section.
+- [x] `packages/metrics/Cargo.toml` declares `name = "torrust-metrics"`.
+- [x] No `Cargo.toml` file in the workspace references `torrust-tracker-metrics`.
+- [x] No Rust source file in the workspace uses `torrust_tracker_metrics::`.
+- [x] `cargo build --workspace` succeeds with zero errors.
+- [x] `cargo test --workspace` passes with zero failures.
+- [x] `linter all` exits with code `0`.
+- [x] `packages/AGENTS.md`, `AGENTS.md`, `docs/packages.md`, and `packages/metrics/README.md` reflect the new crate name.
+- [x] EPIC #1669 `Desired Package State` table lists `torrust-metrics` in the `torrust-` section.
 
 ## Verification Plan
 

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

@@ -36,7 +36,7 @@ torrust-tracker-rest-api-core = { version = "3.0.0-develop", path = "../rest-tra
 torrust-server-lib = { version = "3.0.0-develop", path = "../server-lib" }
 torrust-tracker-clock = { version = "3.0.0-develop", path = "../clock" }
 torrust-tracker-configuration = { version = "3.0.0-develop", path = "../configuration" }
-torrust-tracker-metrics = { version = "3.0.0-develop", path = "../metrics" }
+torrust-metrics = { version = "3.0.0-develop", path = "../metrics" }
 torrust-net-primitives = { version = "3.0.0-develop", path = "../net-primitives" }
 torrust-tracker-primitives = { version = "3.0.0-develop", path = "../primitives" }
 torrust-tracker-swarm-coordination-registry = { version = "3.0.0-develop", path = "../swarm-coordination-registry" }

packages/axum-rest-tracker-api-server/Cargo.toml

@@ -1,7 +1,7 @@
 //! API resources for the [`stats`](crate::v1::context::stats)
 //! API context.
 use serde::{Deserialize, Serialize};
-use torrust_tracker_metrics::metric_collection::MetricCollection;
+use torrust_metrics::metric_collection::MetricCollection;
 use torrust_tracker_rest_api_core::statistics::services::{TrackerLabeledMetrics, TrackerMetrics};
 
 /// It contains all the statistics generated by the tracker.

packages/axum-rest-tracker-api-server/src/v1/context/stats/resources.rs

@@ -1,7 +1,7 @@
 //! API responses for the [`stats`](crate::v1::context::stats)
 //! API context.
 use axum::response::{IntoResponse, Json, Response};
-use torrust_tracker_metrics::prometheus::PrometheusSerializable;
+use torrust_metrics::prometheus::PrometheusSerializable;
 use torrust_tracker_rest_api_core::statistics::services::{TrackerLabeledMetrics, TrackerMetrics};
 
 use super::resources::{LabeledStats, Stats};