kamon-io/Kamon

The Open Source tool for monitoring applications running on the JVM

Marian Diaconu

@neboduus

cmon people, is there anyone which managed to manually instrument a Scala Play 2.6 app?

JR Utily

@JR-Utily

Hello !
I'm wondering is there is a way to "switch" the instrumentation of Kamon on/off
We are considering using it in my team to have better logging through Futures etc
But in our mind, it would be like a DebugMode, that would do nothing if not activated.
So is there a live parameter somewhere to switch off the monitoring ?
Or is the fact not to add the agent a safe way to switch ?
Or should it be always on as soon as we include a Kamon.init() in our code ?

JR Utily

@JR-Utily

@ivantopo any insight for me ? ;)

João Ferreira

@jtjeferreira

@JR-Utily "Or is the fact not to add the agent a safe way to switch" this works for us

Sergio

@sergio_noviello_twitter

I'm still confused if I add the kanela-agent do I still need Kamon.init() ? This is what I have in my build.sbt

    javaAgents += "io.kamon" % "kanela-agent" % "1.0.6"
  )

I'm having a very weird issue, I deployed my app on 7 k8s pods and the kamon traceID is missing on requests sent to some pods

JR Utily

@JR-Utily

@jtjeferreira I've just found that: kamon-io/kanela#105 so I fear it is not the case
To recompile with different code or sbt is really not possible for us, it would lost the benefit of instrumenting through an agent

Marian Diaconu

@neboduus

sorry guys, in Scala 2.6 eager singletons are needed but I was implementing them wrong in dev mode. need to start the app with sbt compile run instead of just sbt run and it flew

JR Utily

@JR-Utily

is there a way to get metrics from Span without reporter ?

to log the span duration in my regular logger

Ivan Topolnjak

@ivantopo

@/all Hey folks! We (the few folks behind Kamon) are going to stop using Gitter in favor of Github Discussions. If you have any ideas, comments and questions please create a new discussion here: https://github.com/kamon-io/Kamon/discussions

Thanks a lot to everyone who has been hanging out here for years and helping other folks. I really hope to see you around Githubs Discussions as well :pray:

In case you are interested in why, just look at the little mess in the history of this channel :smile:.. We would like to keep all comments related to the same topic in the same context, and Gitter threads really fall short on helping us keep track of what has been answered or not. Have a nice day!

Jakub Kozłowski

@kubukoz

so 1 Gitter thread <-> 1 Discussion? I haven't used that yet

SimunKaracic

@SimunKaracic

Yeah, something like that. Just use that to ask questions that are not something that you would open an issue for.
It's still a new feature, but don't be afraid to just open a new discussion, if it's a duplicate or something, we'll redirect you

Jakub Kozłowski

@kubukoz

Can we have a #random discussion too? :D

SimunKaracic

@SimunKaracic

Can you give an example of what you'd post there? Cat pictures? :D

Jakub Kozłowski

@kubukoz

the "did anyone ever" kind of questions, I suppose...

JR Utily

@JR-Utily

it seems quite empty there... maybe people will get afraid of posting in an empty space ?

SimunKaracic

@SimunKaracic

I'll hang around here and keep redirecting people :D
We'll find a way to break the ice

JR Utily

@JR-Utily

so I've reposted my 2 question from here, there ;)

SimunKaracic

@SimunKaracic

Thank you! I'll answer in the afternoon! :D

przemyslaw wierzbicki

@pshemass

Hey Folks, I configured Akka HTTP tracing and I see all traces in Jaeger. How to exclude some of the traces like /healthcheck?

Diego Parra

@dpsoft

kamon.trace.adaptive-sampler.groups {
health-checks {
operations = [
"healthcheck.get"
]
rules {
sample = never
}
}
}

przemyslaw wierzbicki

@pshemass

Thank you sir!

Rajat Khandelwal

@prongs

Hey guys what do you use for visualizing the metrics?

I'm using grafana and was facing some challenges.

The metric coming from kamon jvm.memory.used is a histogram, not a gauge.

I'm not able to wrap my head around how to plot that in grafana.

Specifically, between these two, which one makes more sense

rate(jvm_memory_used_bytes_sum{job=~"$job", region="heap"}[$interval])/rate(jvm_memory_used_bytes_count{job=~"$job", region="heap"}[$interval])

and

jvm_memory_used_bytes_sum{job=~"$job", region="heap"}/jvm_memory_used_bytes_count{job=~"$job", region="heap"}

Basically Rate(sum)/Rate(count) or simply sum/count

Looking in grafana, the first one goes more up and down and the second one is more of a flat line. I'm not sure which one is best suited here.

SimunKaracic

@SimunKaracic

Hello @prongs , we migrated to github discussions, so please follow up with your question over here -> https://github.com/kamon-io/Kamon/discussions

1 reply

Cesar Alvernaz

@calvernaz

@gipeshka Hi, I had the same problem you described here kamon-io/Kamon#886

After upgrading to kamon 2.1.0 the problem went away

Ales Kozumplik

@akozumpl

Hi Kamoners, what are your thoughts on having a Context key with a mutable value? Is that OK, frowned upon or downright broken?

Use case: store some auditing information so that a Play Action can later verify it's not empty / auditing happened.

Arsene

@Tochemey

Hello folks, I would like to know how I can use Kamon with grpc-java.

Yeah I know someone will suggest that we should be put on gh discussion. It has been there for two days and not a single guidance has been given to it.

João Ferreira

@jtjeferreira

I wrote this and we are using it in prod https://github.com/nezasa/kamon-akka-grpc/releases

(akka-grpc client side uses grpc-java. If you were talking about using grpc-java directly then this is not applicable)

Arsene

@Tochemey

@jtjeferreira thanks for the answer. However I am not using akka grpc. I am using the scalapb-grpc which a scala wrapper around the java grpc.

João Ferreira

@jtjeferreira

ok. what do you want to achieve btw? context propagation? metrics?

Arsene

@Tochemey

@jtjeferreira both. Maybe opentracing will be the right choice.

I have seen some kamon-opentracing project which is kind abandoned .

João Ferreira

@jtjeferreira

Looking at https://scalapb.github.io/docs/grpc/ and io.grpc.stub.AbstractStub I would say you can do the instrumentation yourself in io.grpc.CallCredentials#applyRequestMetadata by passing it to callOptions

Arsene

@Tochemey

@jtjeferreira thanks for the suggestion. much appreciated

Tobias Eriksson

@tobiaseriksson

When I look in Prometheus, I can see JVM stats for GC but surprisingly only for "young"
e.g. jvm_gc_seconds_sum

jvm_gc_seconds_sum{collector="g1-young",component="jvm",country="xxx",customer="xxx",datacenter="dc1",environment="prod",generation="young",instance="xxxx:31882",job="xxx-api-metrics",node="host3"}

How could it be that "Old" generation is missing ?

2 replies

Barnabás Oláh

@stsatlantis

Hello, I wanted to read the (kanela-agent) changelog.md but it looks like it's empty :/ Is it on purpose or the content was accidentally deleted?

Maxim Ivanov

@redbaron

This message was deleted

João Ferreira

@jtjeferreira

https://kamon.io/ is down :(

Darren Bishop

@DarrenBishop

Hi. I’m sure it’s been asked many times but what’s the current approach for surfacing JMX data and exporting with Kamon?

16 replies

Sebastien Vermeille

@sebastienvermeille

Hello guys, I am migrating from kamon 1.x to 2.x and have a small issue regarding SystemMetrics.startCollecting(); which no longer exists. Do you know what is the replacement way of doing that ? Kamon.init() ? Thank you in advance for your precious help

1 reply

Kamon.loadModules()

ok top

Peter Nerg

@pnerg

Getting some really weird results out of the akka metrics. So I decided to do a really simple Ping/Pong app with two static actors and one that gets created and killed every 5 seconds.
The metrics for the active actor count just keeps increasing which makes no sense
akka_system_active_actors_count{system="area51-kamon-akka"} 2865.0
Same goes go for queued messages which keeps increasing but as I only send a Ping and a Pong as response it is impossible to have a queue/inbox growing
The PingerPonger code example
I can't see what I'm doing wrong...pointers would be appreciated

Using latest version of Kamon 2.x, Java 11 OpenJDK and Scala 2.13

2 replies

Oliver

@tupol

Hello everybody, a newbie here in need of help.
I am trying out Kamon and so far I had success instrumenting metrics with Prometheus.
Now I am trying to get to instrumenting traces with Zipkin and I am running into some troubles.
I am going back to basics, following the instructions from Elementary Akka Setup.
I can not get any traces in Zipkin nor I see any logged errors.
Here are a few points about my environment:

scala: 2.13.1
akka: 2.6.8
kamon-bundle: 2.1.6
kamon-zipkin: 2.1.6
Zipkin image: docker run -d -p 9411:9411 openzipkin/zipkin
-javaagent:/..full..path../kanela-agent-1.0.6.jar
I would appreciate any good pointers or redirections.

4 replies

David Pennell

@dpennell

test

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