From 4abc78fb2f0df4eb60fa62b8b7d79a7c361646d7 Mon Sep 17 00:00:00 2001
From: Kim Alvefur <zash@zash.se>
Date: Tue, 8 Jun 2021 00:58:27 +0200
Subject: 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.
---
 util/openmetrics.lua | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'util/openmetrics.lua')

diff --git a/util/openmetrics.lua b/util/openmetrics.lua
index 299b36c7..90d3fdc2 100644
--- a/util/openmetrics.lua
+++ b/util/openmetrics.lua
@@ -58,7 +58,7 @@ local function render_histogram_le(v)
 		return "+Inf"
 	end
 
-	return string.format("%g", v)
+	return string.format("%.14g", v)
 end
 
 -- BEGIN of generic MetricFamily implementation
-- 
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