# HG changeset patch
# User Kim Alvefur <zash@zash.se>
# Date 1623106707 -7200
# Node ID 0db763f3f3bef5e55641b2438fc030bbbf43750f
# Parent  64cfa396bb844e13e59dd57d5a6f8966da466e3d
util.openmetrics: Prettify format of histogram buckets

"%g" turns 1GB into 1.07374e+09, which is a bit awkward for the bytes
measurements IMO. Turning up the precision, at "%.17g" turns 0.1 into
0.10000000000000001 while "%0.16" gives 0.1, hiding most of those pesky
floating point artefacts. Lua version 5.2 uses "%.14g" ( see
LUA_NUMBER_FMT in luaconf.h.html ) so it seems like a sensible choice
here.

diff -r 64cfa396bb84 -r 0db763f3f3be util/openmetrics.lua
--- a/util/openmetrics.lua	Mon Jun 07 17:37:14 2021 +0200
+++ b/util/openmetrics.lua	Tue Jun 08 00:58:27 2021 +0200
@@ -58,7 +58,7 @@
 		return "+Inf"
 	end
 
-	return string.format("%g", v)
+	return string.format("%.14g", v)
 end
 
 -- BEGIN of generic MetricFamily implementation