interface plugin: Add link to spec.

diff --git a/src/interface.c b/src/interface.c
index 1e4c5cabc00c38d2021986c9a53e4cb593b6cfcc..a2a9acaeb0655dc0788b0c6b961ecdbe7ddf48a2 100644 (file)
--- a/src/interface.c
+++ b/src/interface.c
@@ -97,6 +97,8 @@ static size_t numif;
 static bool unique_name;
 #endif /* HAVE_LIBKSTAT */
 
+// Based on the OpenTelemetry Semantic Conventions:
+// https://opentelemetry.io/docs/specs/semconv/system/system-metrics/#network-metrics
 enum {
   FAM_DROPPED,
   FAM_PACKETS,