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Repo info
  • Mar 23 2022 12:54
    ivantopo commented #1094
  • Mar 23 2022 09:34
    ivantopo commented #1094
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    ivantopo commented #1094
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  • Mar 23 2022 08:36
    ivantopo opened #1147
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    ivantopo closed #1046
  • Mar 17 2022 11:55
    ivantopo commented #1046
Akash Nema
Hi Everyone
Can someone help me with Kamon-Jaeger Integration. Jaeger is not reading the Kamon spans I have created in my app. Application details:
Scala version: 2.12.13
Jaeger Version: 2.3.1
play framework version: 2.12
akka: 2.6.10
Akash Nema
I'm new to kamon. I have referred https://kamon.io/docs/latest/reporters/jaeger/
I can see the generated span traces in kamon status page but not in jaeger.
I am getting this error after upgrading kamon-bundle to 2.3.1 from 2.2.1
ch.qos.logback.core.joran.spi.JoranException: Problem parsing XML document. See previously reported errors.
        at ch.qos.logback.core.joran.event.SaxEventRecorder.recordEvents(SaxEventRecorder.java:65)
        at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:151)
        at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:110)
        at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:53)
        at ch.qos.logback.classic.util.ContextInitializer.configureByResource(ContextInitializer.java:75)
        at ch.qos.logback.classic.util.ContextInitializer.autoConfig(ContextInitializer.java:150)
        at org.slf4j.impl.StaticLoggerBinder.init(StaticLoggerBinder.java:84)
        at org.slf4j.impl.StaticLoggerBinder.<clinit>(StaticLoggerBinder.java:55)
        at org.slf4j.LoggerFactory.bind(LoggerFactory.java:150)
        at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:124)
        at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:417)
        at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:362)
        at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:388)

Caused by: org.xml.sax.SAXParseException; systemId: jar:file:/Users/shaileshpatil/workspace/xxxx-jar!/logback.xml; lineNumber: 42; columnNumber: 2; The markup in the document following the root element must be well-formed.
        at java.xml/com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1243)
        at java.xml/com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:635)
        at java.xml/com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl.parse(SAXParserImpl.java:324)
        at ch.qos.logback.core.joran.event.SaxEventRecorder.recordEvents(SaxEventRecorder.java:59)
        ... 18 more
Any help will be appreciated
Aditya Maheshwari

How to get current value of a counter? For example -

          .withTag("Reason", "The requested resource could not be found.")

After calling increment how to check if the value was incremented?

Zvi Mints

Hey, I'm facing an issue with the following exception:

2021-11-29 17:44:41.710 31 WARN  MacOperatingSystem:365 - Failed syctl call for process arguments (kern.procargs2), process 42643 may not exist. Error code: 22


  "io.kamon" %% "kamon-core" % "2.4.1",
  "io.kamon" %% "kamon-bundle" % "2.0.6",
  "io.kamon" %% "kamon-prometheus" % "2.0.1",

I'm trying to disable these errors with the following configurations on application.conf:

kamon.modules {
  host-metrics {
    enabled = no

But its not working, any ideas?
cc: @ivantopo (:pray:)

Mayank Srivastava
Hi @ivantopo !! I have recently implemented Kamon Instrumentation to my play application and expect to log traceIds/SpanIds/Context-keys, etc with logback. All of it is built into a docker image. But I faced very weird issue, the same image when run in a container would sometimes work properly and sometimes just skip logging traceId/spanId/context-key etc. This was fairly intermittent. On turning debug mode on for Kanela, I saw both logback and play-framework modules had order=2 and competed to be loaded. When logback loaded before play, everything worked fine but if it loaded after play that is when we noticed missing logback entries. The way I have worked around is to explicitly give different orderings to both above modules. But is that expected behaviour to have two modules compete to be loaded.
Ivan Topolnjak
@/all hey folks, this is a reminder that the official Kamon folks are now giving support on Discord and not checking this room at all. Still some other folks from the community might help here, but if you want to ensure we take a look at your question please drop it on Discord or Github. Thanks!
com.mysql.jdbc.PreparedStatement with message Class versions V1_5 or less must use F_NEW frames.. Class loader: jdk.internal.loader.ClassLoaders$AppClassLoader@9e89d68: java.lang.IllegalArgumentException: Class versions V1_5 or less must use F_NEW frames.
Anybody see this problem?
1 reply
Gaël Bréard
Hi, I'm trying to build with graalvm/native-image but it does not work, I can seee tthis is supported here : https://github.com/kamon-io/Kamon/releases/tag/v2.3.0 but I did not found a doc.
Without option --allow-incomplete-classpath, my build fails. And with this option, I have at runtime : " ERROR kamon.Init - Failed to attach the Kanela agent included in the kamon-bundle"
  • can/should I use allow-incomplete-classpath ?
  • should I add kamon bundle in my dependencies (and thus classpath) ?
Ivan Topolnjak
Hey @mofei100 and @gbrd, please come over to the Discord server, we are not looking at this chat very often: https://discord.gg/weHgVmJYNY
Hi. How can we use kamon-testkit with Java ? Are there any examples or documentation ? I'd like to test Kamon metrics. Thank you
Oleksandr Shevchenko

I have a problem with response B3 headers propagation for Kamon http4s.


Jaeger export works fine, also I see that B3 headers propagated correctly to my http4s service from a previous one but I don't see B3 headers in the server response. kamon.propagation.http.default.entries.outgoing.span should be b3 by default.

kamon {
  environment {
    service = "service2"

  trace {
    join-remote-parents-with-same-span-id = no
    adaptive-sampler {
      groups {
        metrics {
          operations = ["/metrics"]
          rules {
            sample = never
        healthz {
          operations = ["/healthz"]
          rules {
            sample = never

  prometheus {
    start-embedded-http-server = yes
    embedded-server {
      hostname = ""
      port = 9095
      metrics-path = "/metrics"

  jaeger {
    host = "jaeger-collector.svc.cluster.local"
    port = 14268

I found a couple of issues on Github but looks like it has already been resolved.
Any thoughts on what can be wrong?

1 reply
Zvi Mints
Hey, i'm trying to integrate with p8s and akka metrics.
Can someone take a look?
Oliver Schrenk

I don't understand the difference of a Context Tag and a Context Entry

Only tags seem to be able to me merged back to MDC ( see https://kamon.io/docs/latest/instrumentation/logback/#copying-context-to-the-mdc ) and when I look at https://kamon.io/docs/latest/core/context/ tag are not mentioned.

Are they both the same (but historically different)?

Hi, I am using I have a gauge kamon metric named ws_active_connections that contains 3 tags, tag1 with cardinality 417, tag2 with cardinality 25 and tag3 with cardinality 3.
As you can calculate that metric could have 417 25 3 = 31.275 time series. For that reason I have some concerns:
  1. memory issues due to the amount of time series store internally (I think is a TrieMap)
  2. performance and cardinality due to the amount of calls made to lookup and execute increment/decrement operations
    Please, can you give me some advise?
Hello Everyone.
I am new Scala and Akka. I am getting the below issue. Can anyone help out on this??
native/libsigar-universal64-macosx.dylib' (fat file, but missing compatible architecture (have 'unknown,x86_64', need 'arm64e'))
1 reply
Deepika H

Hey All,
I am using kamon-akka-http to fetch metrics around the requests, I am currently not seeing metrics related to status code 500 instead the count is incremented for 200 status code,
for e.g. span_processing_time_seconds_count{component="akka.http.server", error="false", http_method="POST", http_status_code="200", instance="localhost:9095", job="Case-actor-metrics", operation="/case/v1/cases", span_kind="server"}

even though POST /case/v1/cases gave me 500 http status code, The metrics counter is incremented for 200 status code on the same route and request method. Is this a bug in the library or Am I missing anything here?

Zhenhao Li
hi all, I notice that questions here are rarely answered.
If your question is for work and your company has a budget for paid consulting, I invite you to create a pairing request on https://pairtime.com. If I can't help myself, I will do my best to find the right people to help you.
Damian Albrun

Hi guys, I'm struggling to configure kamon to work along with lightbend cinnamon propagation. One case is http propagation, cinnamon puts in the http client headers Cinnamon-MDC which is values encoded in base64. What I'd like to do is accept that optional header an implement a custom http header codec so I can parse it and add it to the context without overriding the kamon ones if that makes sense.

I'm looking to rollout the change from cinnamon to kamon service to service without losing telemetry. In the docs custom codecs are mentioned, but it seems outdated since the last version doesn't have such trait.

I've tried to find examples in the repo but I'm not having any luck so far


Hi, I'm having the following issue:

io.prestosql.jdbc.PrestoConnection and kamon.instrumentation.jdbc.HasConnectionPoolTelemetry are in unnamed module of loader 'app'

any tips? :)


I am using below jars in our project

 implementation "io.kamon:kamon-akka-2.5_${scalaVersion}:1.1.4"
  implementation "io.kamon:kamon-prometheus_${scalaVersion}:2.5.1"

getting an error like [DelegatingClassLoader@4776f82a] error at <Unknown>::0 can't bind type name 'kamon.context.HasContext'
Does anybody has any idea why i am getting this error after i updated kamon-akka-2.5 from 1.1.3 to 1.1.4 and io.kamon:kamon-prometheus to 2.5.1 ?

Vahid Zoghi
I'm trying to disable all span metrics in my setup but can't find a way to do so. There are configs for specific instrumentations like Play http (server and client) but other instrumentations like Redis don't have that configuration option. So to cut Datadog costs I have no choice other than to turn off the whole Datadog metrics module. I'm hoping that there's a way to turn off all span metrics that I've overlooked. I also checked this issue which asks for the same thing on Redis instrumentation:
Moritz Schallaböck
I'm updating our Cassandra library to 4.x (https://docs.datastax.com/en/developer/java-driver/4.14/). I can't find anything about it in the documentation, but from looking at the kamon-cassandra source code, that version of the cassandra driver isn't supported. The driver itself exposes dropwizard metrics, but it seems those aren't visible to Kamon either? Is there any option for metrics with the latest Cassandra driver?
1 reply
Bartosz Kumorek
Hello, im starting with monitoring of lagom application using kamon + prometheus + grafana. Im having working communication between kamon telemetry + prometheus but i don't know how to create simple dashboards in grafana (i would to have http server statistics like active requests or akka metrics). I found some templates but they seem to not work on kamon 2 or "newest' prometheus. It is possible to search for this knowledge anywhere? Im a beginner with grafana and prometheus.