[SR-Users] Re: Module snmpstats reporting inconsistent call success metrics on intense peaks of failed calls

15 Jan 2025

      Hello Olle,
Do you mean there is a scale limit? Maybe because the counter is 32bits counter?
Regards,
Igor.
De : Olle E. Johansson oej@edvina.net 
Envoyé : mardi 14 janvier 2025 12:47
À : Kamailio (SER) - Users Mailing List sr-users@lists.kamailio.org
Cc : Olle E Johansson oej@edvina.net; Henning Westerholt hw@gilawa.com; Igor Potjevlesch igor.potjevlesch@gmail.com
Objet : Re: [SR-Users] Module snmpstats reporting inconsistent call success metrics on intense peaks of failed calls
Note that SNMP counters wrap, so it may be expected behaviour.
/O
On 14 Jan 2025, at 11:51, Igor Potjevlesch via sr-users <sr-users@lists.kamailio.org mailto:sr-users@lists.kamailio.org > wrote:
Hello Henning,
Undertstood! Thank you. If there is nothing to do, we will move on the upgrade.
Regards,
Igor.
De : Henning Westerholt < mailto:hw@gilawa.com hw@gilawa.com> 
Envoyé : lundi 13 janvier 2025 17:20
À : 'Kamailio (SER) - Users Mailing List' < mailto:sr-users@lists.kamailio.org sr-users@lists.kamailio.org>
Cc : Igor Potjevlesch < mailto:igor.potjevlesch@gmail.com igor.potjevlesch@gmail.com>
Objet : RE: [SR-Users] Module snmpstats reporting inconsistent call success metrics on intense peaks of failed calls
Hello Igor,
hard to say 100%, because it could be also caused from another module (the snmp modules also takes data from other sources I think).
Generally, I would always of course recommended to use a maintained version in production.
Cheers,
Henning
From: Igor Potjevlesch < mailto:igor.potjevlesch@gmail.com igor.potjevlesch@gmail.com> 
Sent: Montag, 13. Januar 2025 15:12
To: Henning Westerholt < mailto:hw@gilawa.com hw@gilawa.com>; 'Kamailio (SER) - Users Mailing List' < mailto:sr-users@lists.kamailio.org sr-users@lists.kamailio.org>
Subject: RE: [SR-Users] Module snmpstats reporting inconsistent call success metrics on intense peaks of failed calls
Hello Henning,
Thank you for your check.
Do you mean that even if we upgrade to the latest branch, we will probably face the same issue?
Regards,
Igor.
De : Henning Westerholt < mailto:hw@gilawa.com hw@gilawa.com> 
Envoyé : lundi 13 janvier 2025 14:36
À : Kamailio (SER) - Users Mailing List < mailto:sr-users@lists.kamailio.org sr-users@lists.kamailio.org>
Cc : Igor Potjevlesch < mailto:igor.potjevlesch@gmail.com igor.potjevlesch@gmail.com>
Objet : RE: [SR-Users] Module snmpstats reporting inconsistent call success metrics on intense peaks of failed calls
Hello Igor,
this sounds like a bug to me. The 5.6.x branch is not supported anymore, but after I a quick look I did not spotted any recent bugfixes in the modules that could match.
Cheers,
Henning
-- 

Henning Westerholt –  https://skalatan.de/blog/ https://skalatan.de/blog/

Kamailio services –  https://gilawa.com/ https://gilawa.com

From: Igor Potjevlesch via sr-users < mailto:sr-users@lists.kamailio.org sr-users@lists.kamailio.org> 
Sent: Montag, 13. Januar 2025 13:40
To:  mailto:sr-users@lists.kamailio.org sr-users@lists.kamailio.org
Cc: Igor Potjevlesch < mailto:igor.potjevlesch@gmail.com igor.potjevlesch@gmail.com>
Subject: [SR-Users] Module snmpstats reporting inconsistent call success metrics on intense peaks of failed calls

Hello!

We are plotting the call success rate on each of our proxies.

Using the Kamailio snmpstats module, we try to obtain three counters to plot them on a graph:

    Total Calls

    Active Calls

    Error Calls

Most of the time, everything works well, and we obtain sensible values:

snmpwalk -c mycommunity -v 2c W.X.Y.Z 1.3.6.1.4.1.34352.3.1.3.1.3.2 -O n

    .1.3.6.1.4.1.34352.3.1.3.1.3.2.1.0 = Gauge32: 309 -> Total Calls

    .1.3.6.1.4.1.34352.3.1.3.1.3.2.2.0 = Gauge32: 95 -> Active Calls

    .1.3.6.1.4.1.34352.3.1.3.1.3.2.3.0 = Gauge32: 214 -> Error calls

However, when our proxies are facing intense peaks of failed calls in a short time span, sometimes, the "Error Calls" counter returns a value higher than "Total Calls". As a result, "Active Calls" suddenly reaches a value close to the maximum of a Gauge32 (because T o t a l C a l l s − E r r o r C a l l s < 0 ).

snmpwalk -c mycommunity -v 2c W.X.Y.Z 1.3.6.1.4.1.34352.3.1.3.1.3.2 -O n

    .1.3.6.1.4.1.34352.3.1.3.1.3.2.1.0 = Gauge32: 153 -> Total Calls

    .1.3.6.1.4.1.34352.3.1.3.1.3.2.2.0 = Gauge32: 4294967226 -> Active Calls

    .1.3.6.1.4.1.34352.3.1.3.1.3.2.3.0 = Gauge32: 223 -> Error calls

As a result, our graphs make no more sense.

We are currently running kamailio 5.6.4.

Any idea if it's a bug or a configuration issue?

Regards,

Igor. 

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[SR-Users] Re: Module snmpstats reporting inconsistent call success metrics on intense peaks of failed calls