Add note of incompatibility with trunk since 5f15ab7c6ae5

author: Kim Alvefur <zash@zash.se>
date: Sat, 19 Jun 2021 12:55:14 +0200
parent: 4555:1e70538e4641
child: 4596:c406e4bf7ee5
--- a/mod_prometheus/mod_prometheus.lua	Wed Jun 16 17:32:43 2021 +0200
+++ b/mod_prometheus/mod_prometheus.lua	Sat Jun 19 12:55:14 2021 +0200
@@ -17,6 +17,8 @@
 local get_metric_registry = statsman.get_metric_registry;
 local collect = statsman.collect;
 
+assert(get_stats, "not compatible with trunk based on openmetrics");
+
 local function escape(text)
 	return text:gsub("\\", "\\\\"):gsub("\"", "\\\""):gsub("\n", "\\n");
 end