Provide a warn/error when kubernetes-config can't read target resource.

[iocanel]

Description

It has been reported that in some cases kubernetes-config might fail silently to read the target kubenretes resource.
We need to at least provided a detailed explanation on why this happens.

Scenarios to check

• resource does not exist
• insufficient permission to read resource
• client can't reach API server

Client can't each the API sever

The error message below does not make it very clear on what is going on.

2023-05-31 14:45:53,390 ERROR [io.qua.run.Application] (Quarkus Main Thread) Failed to start application (with profile [dev]): io.netty.channel.ConnectTimeoutException: connection timed out: /10.0.0.2:8081
	at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe$1.run(AbstractNioChannel.java:261)
	at io.netty.util.concurrent.PromiseTask.runTask(PromiseTask.java:98)
	at io.netty.util.concurrent.ScheduledFutureTask.run(ScheduledFutureTask.java:153)
	at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174)
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:167)
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:569)
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.base/java.lang.Thread.run(Thread.java:833)

The actual stack trace that is getting shortened is:

java.lang.RuntimeException: Failed to start quarkus
	at io.quarkus.runner.ApplicationImpl.doStart(Unknown Source)
	at io.quarkus.runtime.Application.start(Application.java:101)
	at io.quarkus.runtime.ApplicationLifecycleManager.run(ApplicationLifecycleManager.java:111)
	at io.quarkus.runtime.Quarkus.run(Quarkus.java:71)
	at io.quarkus.runtime.Quarkus.run(Quarkus.java:44)
	at io.quarkus.runtime.Quarkus.run(Quarkus.java:124)
	at io.quarkus.runner.GeneratedMain.main(Unknown Source)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
	at io.quarkus.runner.bootstrap.StartupActionImpl$1.run(StartupActionImpl.java:104)
	at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: java.lang.RuntimeException: Unable to obtain configuration for Secret objects from Kubernetes API Server at: http://10.0.0.2:8081/
	at io.quarkus.kubernetes.config.runtime.KubernetesConfigSourceProvider.getSecretConfigSources(KubernetesConfigSourceProvider.java:130)
	at io.quarkus.kubernetes.config.runtime.KubernetesConfigSourceProvider.getConfigSources(KubernetesConfigSourceProvider.java:54)
	at io.quarkus.runtime.configuration.ConfigUtils.addSourceProvider(ConfigUtils.java:225)
	at io.quarkus.runtime.configuration.ConfigUtils.addSourceProviders(ConfigUtils.java:239)
	at io.quarkus.runtime.generated.Config.readConfig(Unknown Source)
	at io.quarkus.deployment.steps.RuntimeConfigSetup.deploy(Unknown Source)
	... 13 more
Caused by: io.fabric8.kubernetes.client.KubernetesClientException: Operation: [get]  for kind: [Secret]  with name: [postgresql]  in namespace: [default]  failed.
	at io.fabric8.kubernetes.client.KubernetesClientException.launderThrowable(KubernetesClientException.java:159)
	at io.fabric8.kubernetes.client.dsl.internal.BaseOperation.requireFromServer(BaseOperation.java:191)
	at io.fabric8.kubernetes.client.dsl.internal.BaseOperation.get(BaseOperation.java:142)
	at io.fabric8.kubernetes.client.dsl.internal.BaseOperation.get(BaseOperation.java:93)
	at io.quarkus.kubernetes.config.runtime.KubernetesConfigSourceProvider.getSecretConfigSources(KubernetesConfigSourceProvider.java:116)
	... 18 more
Caused by: java.io.IOException: connection timed out: /10.0.0.2:8081
	at io.fabric8.kubernetes.client.dsl.internal.OperationSupport.waitForResult(OperationSupport.java:514)
	at io.fabric8.kubernetes.client.dsl.internal.OperationSupport.handleResponse(OperationSupport.java:534)
	at io.fabric8.kubernetes.client.dsl.internal.OperationSupport.handleGet(OperationSupport.java:481)
	at io.fabric8.kubernetes.client.dsl.internal.BaseOperation.handleGet(BaseOperation.java:745)
	at io.fabric8.kubernetes.client.dsl.internal.BaseOperation.requireFromServer(BaseOperation.java:186)
	... 21 more
Caused by: io.netty.channel.ConnectTimeoutException: connection timed out: /10.0.0.2:8081
	at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe$1.run(AbstractNioChannel.java:261)
	at io.netty.util.concurrent.PromiseTask.runTask(PromiseTask.java:98)
	at io.netty.util.concurrent.ScheduledFutureTask.run(ScheduledFutureTask.java:153)
	at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174)
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:167)
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:569)
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)

[quarkus-bot]

/cc @Sgitario (kubernetes), @geoand (kubernetes)

[geoand]

@iocanel are you going to handle this one?