The logs stop repeating what metrics and their own fields say (#363)

iPX logged scan_done after every scan: 921 lines a day, a fifth of the
log, nearly all "scan complete, 1 feed(s)" since scans became one or two
feeds at a time (#114). ipx_jobs_total, ipx_feed_fetches_total and
ipx_last_scan_age_seconds hold all of it. It is routine now, at debug, so
the page's log view keeps it. The dashboard's "feeds checked" series and
the prod check's check 4 read the metrics instead.

ipx-directory wrote each line's span twice, as `span` and in `spans`, and
neither added anything: a request's span repeated its method, path and
status, refresh.feeds repeated `checked`, a feed span was empty.

ipx::http stays: it repeats Caddy's access line and the span, but holds
the route pattern and ipx's own time, which the dashboard groups by.

The prod check's `status` line was the healthcheck's every 30 s; since
#218 it is only `ipx status` run by hand, and the skill says so.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/ipx/CHANGELOG.md

@@ -12,6 +12,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+
+- The log no longer has a line for every scan that finishes, a fifth of its lines; the metrics count scans, and the page's log view still shows them (#363).
+
 ### Fixed
 
 - A feed you already have, added again by the same address over http rather than https or the other way round, is the one you have, not a second subscription with every item twice. Changing a feed's address to another feed's over the other scheme is refused the same way (#362).

crates/ipx/src/ipc.rs

@@ -307,7 +307,9 @@ fn log_event(e: &Event, wire: bool) {
         _ => (None, None),
     };
     let routine = match e {
-        Event::Progress { .. } | Event::FeedSkip { .. } | Event::FeedStart { .. } => true,
+        // A scan's end: ipx_jobs_total, ipx_feed_fetches_total and ipx_last_scan_age_seconds hold it,
+        // and since scans became one or two feeds at a time it was a fifth of the log (#363).
+        Event::Progress { .. } | Event::FeedSkip { .. } | Event::FeedStart { .. } | Event::ScanDone { .. } => true,
         Event::FeedDone { new, downloaded, failed, torrents, .. } => {
             *new == 0 && *downloaded == 0 && *failed == 0 && *torrents == 0
         }