From 502f287c960f910eb4cc019ff6b8a877cfa15f5d Mon Sep 17 00:00:00 2001
From: Ben Kochie <superq@gmail.com>
Date: Wed, 21 Jul 2021 19:28:54 +0200
Subject: [PATCH] Fix rapl collector log noise

Capture permission denied error for "energy_uj" file.

Fixes: https://github.com/prometheus/node_exporter/issues/1892

Signed-off-by: Ben Kochie <superq@gmail.com>
---
 collector/rapl_linux.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/collector/rapl_linux.go b/collector/rapl_linux.go
index a0f90119..b73c0dd8 100644
--- a/collector/rapl_linux.go
+++ b/collector/rapl_linux.go
@@ -70,6 +70,10 @@ func (c *raplCollector) Update(ch chan<- prometheus.Metric) error {
 	for _, rz := range zones {
 		newMicrojoules, err := rz.GetEnergyMicrojoules()
 		if err != nil {
+			if errors.Is(err, os.ErrPermission) {
+				level.Debug(c.logger).Log("msg", "Can't access energy_uj file", "zone", rz, "err", err)
+				return ErrNoData
+			}
 			return err
 		}
 		index := strconv.Itoa(rz.Index)