changelog: date the 0.0.25 section

CHANGELOG.md

@@ -4,13 +4,12 @@ All notable changes to nxdns are recorded here. The format follows [Keep a Chang
 
 Sections are written by hand. Nothing here is generated from commit messages: the point of the file is to say what changed for an operator, which a commit subject rarely does.
 
-## [Unreleased]
+## [0.0.25] - 2026-10-22
 
 ### Fixed
 
 - **The DNS cache's memory is bounded in bytes, not only in entries.** Each cached answer is copied at whatever size the upstream sent, so 10000 entries could in principle hold 10000 large answers. The answers now share a budget of 256 bytes per `cache.size` entry, about 2.4 MiB at the default, and when a new answer does not fit, answers nobody has asked for lately make room for it. An answer larger than the whole budget is not cached. `/metrics` reports `nxdns_cache_response_bytes` against `nxdns_cache_max_bytes`, and counts `nxdns_cache_oversized_total` and `nxdns_cache_copy_failures_total`.
 - **The DNS cache no longer evicts an answer while it has free room.** A new answer replaced an older one whenever the eviction scan met it first, even with most of the cache empty. A copy of an answer that failed for lack of memory was also dropped without a trace; it is now counted, and a failed replacement keeps the answer already cached.
-
 - **A refused query history says what to do.** When nxdns refuses to open `querylog.db`, because a newer release wrote it or it cannot be converted, the message now gives the remedy: run the newer release again, put back the `querylog.db.pre-migrate-*` copy, or move the file and its `-wal` and `-shm` files aside to start an empty history. It used to point at a documentation page.
 - **A refused start no longer gives advice that does not apply.** After a query history refusal, `nxdns run` also printed "run `nxdns check`" and "load one with `nxdns import <file>`", though the configuration was fine. The import hint now appears only when the database has no usable upstream, and neither hint follows a database refusal.
 
@@ -24,6 +23,10 @@ Sections are written by hand. Nothing here is generated from commit messages: th
 - **Each database connection keeps a page cache sized for its job** instead of SQLite's 2 MiB default on all seven: 256 KiB for the configuration database and for retention, 1 MiB for the query-history writer and reader.
 - **The documentation is written for people running nxdns.** It starts from Get started, which downloads a release instead of building from source, and drops the API reference, the troubleshooting page and the performance pages. It is published at <https://nxdns.sh/docs/>, and `INSTALL.md` in the tarball links there.
 
+### Removed
+
+- **`nxdns_udp_server_dropped_no_slot_total`**, because a UDP query is no longer dropped for lack of room: it waits. A query still waiting when the listener shuts down is counted in the new `nxdns_udp_server_dropped_at_shutdown_total`.
+
 ## [0.0.24] - 2026-10-21
 
 ### Fixed