Persist all releated to exceptions metrics, while sampling everything else

Question

We are trying to collect all metrics related to exceptions (request, dependency, trace) without sampling) without sampling, to provide a better debug experience.

According to https://learn.microsoft.com/en-us/azure/azure-monitor/app/sampling-classic-api

It seems like it is enough to customise Exception event sampling rate.
However))

What we have tried:

Try 1

1. Fixed-rate sampling for exceptions set to 99.9999 (internal SDK stuff which ignore 100)
2. Disabled sampling for other metrics (relying on ingesting)
3. Ingesting (AI level sampling) set to 2%.
   Results
   Every Exception Request Trace and Dependency are visible in 'Live Metrics'
   Every Exception is persisted and is visible in the Transaction search
   Only 2% of related metrics are visible in the Transaction search which affects End-To-End transactions (you are able to see the expected full request history only in this 2% cases)
   And official monitor request against the log shows that.

union requests,dependencies,pageViews,browserTimings,exceptions,traces

| where timestamp > ago(1d)

| summarize RetainedPercentage = 100/avg(itemCount) by bin(timestamp, 1h), itemType

Try 2

1. Default adaptive sampling
2. Custome ITelemetryInitializer

public class ExceptionTelemetrySamplingFilter : ITelemetryInitializer
{
    public void Initialize(ITelemetry telemetry)
    {
        if (telemetry is ExceptionTelemetry)
        {
            ((ISupportSampling)telemetry).SamplingPercentage = 99.99999;
        }
    }
}

3. Ingesting (AI level sampling) set to 2%.
   The results are the same as for try 1.

Try 3

1. Fixed-rate sampling for exceptions set to 99.9999 (internal SDK stuff which ignores 100)
2. Fixed-rate sampling for others set to 2 (prevent ingesting)
   The result is the same as for previous, except that now in 'Live Metrics' we see only Exceptions and others with 2% chance.

Any suggestions so it can be achieved?