[PATCH common 1/1] proc stat: remove unused sum metric

[Thomas Ellmenreich <t.ellmenreich@proxmox.com>]

read_proc_stat  initializes a 'sum' metric, but never actually sets it
to a value. The metric is also never used, but does end up adding noise
to the displayed metrics.

Signed-off-by: Thomas Ellmenreich <t.ellmenreich@proxmox.com>
---
metrics server, to answer this: [1] forum question, I noticed that
the OpenTelemetry metric 'proxmox_node_cpustat_sum_ratio' always
remained on '0'. During the investigation, I realized that the value
is initialized, but then never actually assigned to, so I propose it
to be removed.

Grepping through all of our repositories, I could not find any
occurrence where we actually use this 'sum' property on the return
value of 'read_proc_stat'.

During the investigation, I had a Prometheus instance running and
pushed metrics to it by configuring it as an OpenTelemetry metrics
server in a PVE instance. I repeated the same setup with this patch
applied, and the 'proxmox_node_cpustat_sum_ratio' metric has
disappeared as expected.

[1]: https://forum.proxmox.com/threads/questions-about-otel-metrics-listing.184949/#post-866365

 src/PVE/ProcFSTools.pm | 1 -
 1 file changed, 1 deletion(-)

diff --git a/src/PVE/ProcFSTools.pm b/src/PVE/ProcFSTools.pm
index bb8d276..12e0358 100644
--- a/src/PVE/ProcFSTools.pm
+++ b/src/PVE/ProcFSTools.pm
@@ -257,7 +257,6 @@ sub read_proc_stat {
         steal => 0,
         guest => 0,
         guest_nice => 0,
-        sum => 0,
     };
 
     my $cpucount = 0;
-- 
2.47.3