metrics: peak gauges for in-flight queries, stream connections and the query log queue

2026-10-19 23:08:58 +02:00
parent 9d2511ee58
commit 36e11ca71d
12 changed files with 335 additions and 10 deletions
@@ -4,6 +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.

+## [0.0.22] - 2026-10-19
+
+### Added
+
+- **`/metrics` reports the most concurrent work the server has seen.** Five gauges hold peaks since start: `nxdns_dns_in_flight_peak` (queries handled at once, every listener together), `nxdns_tcp_server_connections_peak`, `nxdns_dot_server_connections_peak` and `nxdns_doh_server_connections_peak` (connections one listener held at once), and `nxdns_querylog_queue_peak` (entries waiting for the query log writer at once). The memory budget work sizes its limits from them; "Measure performance" shows how to read them beside the process's resident memory, thread count and worker stacks.
+
 ## [0.0.21] - 2026-09-12

 ### Changed