service/prometheus.md

@@ -1550,6 +1550,9 @@ down. See [tpo/tpa/team#41642](https://gitlab.torproject.org/tpo/tpa/team/-/issu
 The site [`relabeler.promlabs.com`](https://relabeler.promlabs.com/) can be extremely useful to
 iterate more quickly over those configurations.
 
+Note that this is not the same as [recording rules](https://prometheus.io/docs/practices/rules/#recording-rules), which we do
+not currently use.
+
 ## Debugging the blackbox exporter
 
 The [upstream documentation][] has some details that can help. We also