feat: [#1358] remove persistent metric from torrent-repository pkg

This package dones not have persistence. Persistence is only handle in
the `tracker-core` pacakge. The metric will be included there.

Author: josecelano

packages/torrent-repository/src/statistics/mod.rs

@@ -8,7 +8,6 @@ use torrust_tracker_metrics::metric_name;
 use torrust_tracker_metrics::unit::Unit;
 
 const TORRENT_REPOSITORY_RUNTIME_TORRENTS_DOWNLOADS_TOTAL: &str = "torrent_repository_runtime_torrents_downloads_total";
-const TORRENT_REPOSITORY_PERSISTENT_TORRENTS_DOWNLOADS_TOTAL: &str = "torrent_repository_persistent_torrents_downloads_total";
 
 #[must_use]
 pub fn describe_metrics() -> Metrics {
@@ -22,13 +21,5 @@ pub fn describe_metrics() -> Metrics {
         )),
     );
 
-    metrics.metric_collection.describe_counter(
-        &metric_name!(TORRENT_REPOSITORY_PERSISTENT_TORRENTS_DOWNLOADS_TOTAL),
-        Some(Unit::Count),
-        Some(&MetricDescription::new(
-            "The total number of torrent downloads since persistent statistics were enabled the first time.",
-        )),
-    );
-
     metrics
 }