Graph/ea28645a-bf14-4a76-8012-cfec4c19d633

Domainunvalidated

Tracing

ea28645a-bf14-4a76-8012-cfec4c19d633

Tracing

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Updated4/30/2026

PageRank0.0002

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IMPLEMENTATION_OFComponent

micrometer-tracing-test

PERTAIN_TOProblem

I set the traces sample rate to 0.0 so as to stop the transactions being published to sentry — in the spring boot application. Tension: We would be using sentry for error reporting but not for performance monitoring.

PERTAIN_TOSolution

It should be possible to completely disable tracing with either: — sentry:.

PERTAIN_TOProblem

global breadcrumbs are not available with every Sentry event in the add-in

PERTAIN_TOSolution

You can add your own custom context by adding it to the scope. — Add this right after you initialize the SDK, so that it is on the scope used whenever events are generated from your app. Tension: They aren't as useful for bits of information that apply throughout the app. Outcome: You should also set `o.IsGlobalModeEnabled = true` in your options - since this is a client app.

PERTAIN_TOProblem

I want to disable EB health check entries. — I've set up entry in a django project. Tension: I tried to do it with middleware like this. Outcome: It can be done by `traces_sampler`.

PERTAIN_TOSolution

It can be done by `traces_sampler` — if sampling_context['wsgi_environ']['HTTP_USER_AGENT'] == 'ELB-HealthChecker/2.0':. Outcome: return 0.

PERTAIN_TOSolution

Each route with a decorator are registred in a dictionary with their trace/error rate — I then used a trace_sampler/before_send function as indicated here. Tension: I finally managed to do it using a registry mechanism. Outcome: Each route with a decorator are registred in a dictionary with their trace/error rate. I then used a trace_sampler/before_send function as indicated here.

PERTAIN_TOProblem

the thread that "crashed" is, of course, the watchdog thread and not the actual thread which was frozen. Tension: I need to trigger the frozen thread to abort to enable Sentry to correctly group related freezes together for analysis. Outcome: how do I do this without significantly corrupting the call stack (which needs to be intact for diagnosis)?

PERTAIN_TOSolution

You can set the trap flag to cause an `EXCEPTION_SINGLE_STEP`. — On Windows. Outcome: context.EFlags |= 0x100; // set trap flag.

PERTAIN_TOProblem

the health check is filling all the Sentry transaction limits — I have a Django application with a health check endpoint that's using django-health-check. Tension: How can I exclude the health check endpoint in Sentry? Outcome: use a sampling function to control the sample rate according to the URL or other parameters.

PERTAIN_TOSolution

if url.startswith('/ht/'): return 0 # Don't trace any of these transactions — sentry_sdk.init( # ... traces_sampler=traces_sampler, ). Tension: the health check is filling all the Sentry transaction limits. Outcome: return 0.1 # Trace 10% of other transactions.

PERTAIN_TOProblem

Sentry debug mode repeatedly prints logging output and captures errors, but the integration does not work as expected when testing with an intentional exception.

PERTAIN_TOSolution

Set `dsn` to a string value (e.g., `dsn: 'REDACTED'`) per the Sentry docs, then verify Docker DNS/network settings and host resolution so Sentry events can reach Sentry’s ingest endpoint.

PERTAIN_TOProblem

figure out which statement from the block is currently running in Postgres. Outcome: The simple solution is to throw in, at positions you want to know ...

PERTAIN_TOSolution

You can achieve that for all statements without altering the code block using `auto_explain`. — without altering the code block. Tension: I am not aware of a simpler way. Outcome: LOAD 'auto_explain';.

PERTAIN_TOSolution

The ideal solution though is to use pgsentinel. — It shows what is running at the moment as well associated top level block. Tension: we can monitor what is going on. Outcome: It shows what is running at the moment as well associated top level block.

PERTAIN_TOSolution

flip `debug_print_plan` on — `pg_stat_statements` / `pg_stat_activity` show only the main block, not specific queries. Tension: that'll keep throwing whole parse trees at you. Outcome: it'll do exactly that.

PERTAIN_TOProblem

I need to find the tables involved by each function. — understand a new ERP system and the tables involved when different business functions are taking place. Tension: if we have a vehicle purchase, we need to identify table that this function has inserted/updated data. Outcome: Is there any similar tool in PostgreSQL?

PERTAIN_TOSolution

revoke all privileges on all tables — for each function. Tension: run a function call. Outcome: repeat until the function runs as desired.

PERTAIN_TOProblem

the tomcat jvm intermittently dies — If I start tomcat with the debugger to investigate something. Tension: always dies...just dies at different steps each time within 3-5 min of using the app.

PERTAIN_TOProblem

Started tracing 0 functions. — frida-trace -U -f org.mozilla.firefox -i "checkRequest*". Outcome: It displayed this to me.

PERTAIN_TOSolution

For capturing Java methods of any class that start with checkRequest you need to use `-j "*!checkRequest*"`. — If you want to trace Java/Kotlin methods. Outcome: You should be able to get a Java stack trace by raising a Java exception using Frida and then catch it directly to get the exception with included stack trace.

PERTAIN_TOProblem

I got nothing in the evt.etl file. Tension: Get-WinEvent : No events were found that match the specified selection criteria. Outcome: It turned out to be this provider is protected.

PERTAIN_TOSolution

only the trace created by Windows can read from it — to collect events from builtin providers. Tension: You can't create a trace with it. Outcome: Also, run as SYSTEM is required.

PERTAIN_TOProblem

HTTP request headers are not a good way to track users — In case of HTTP requests like HEAD / GET / POST etc. Tension: the server has no way to verify their authenticy.

PERTAIN_TOProblem

Now the .WAR can be deployed under Tomcat, but I still can't run it with `java -jar`. The error message is: java.lang.ClassNotFoundException: My.App. — the compiled class of My.App was put in a .JAR (under WEB-INF/lib where all the other dependencies are located). Tension: instead of putting it under WEB-INF/classes. Outcome: This is a Proof of Concept (PoC) test.

PERTAIN_TOProblem

when it calls `forward` on `org.apache.catalina.core.ApplicationDispatcher`, st epping into doesn't act like it knows where to go — I attach to my Tomcat instance and run inside of IntelliJ.

PERTAIN_TOProblem

the cast fails at runtime with a `ClassCastException` — working with the `micrometer-tracing-test` library in a Java project. Tension: Both `OtelTraceContext` and `SimpleTraceContext` share the same parent interface, `TraceContext`.

PERTAIN_TOSolution

Where/how are you instantiating your tracer? — Is it a SimpleTracer or an OtelTracer? Tension: You need to be consistent to avoid this sort of exception. Outcome: You need to be consistent to avoid this sort of exception.

PERTAIN_TOSolution

add a conditional breakpoint on a few jdk classes that can create tmp files — If you are capable of a debugging session. Tension: you need to edit the webserver launcher script. Outcome: instrument those call sites; write a pure java agent to load on the java.exe command line.

PERTAIN_TOProblem

this does not happen — whenever the tracee creates a new thread. Tension: I must also follow all threads created by the traced program.

PERTAIN_TOSolution

To get the effect you want. Tension: you're not resuming the parent before you wait for the child!

PERTAIN_TOProblem

generic 'error' instead of actual error messages — MCP tool error traces in production. Tension: making debugging impossible.

PERTAIN_TOSolution

Fix callToolTraced — from result.content[0].text (or the caught exception message). Tension: instead of hardcoding 'error'. Outcome: all tool error traces contain the real error message.

PERTAIN_TOReport

console-gateway/api OTel traces never link cross-service — no propagation.inject/extract anywhere, tsx blocks auto http/undici instrumentation

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