Allow custom registration of Redis ElasticApmProfiler

[glucaci]

In order to register the profiler for Microsoft.Extensions.Caching.StackExchangeRedis we need public access to ElasticApmProfiler because the IConnectionMultiplexer is encapsulated in the RedisCache implementation.

Bellow is an example for which I have also opened a PR in dotnet/aspnetcore#31018 to allow hooking up the ProfilerSession

public static class ServiceCollectionExtensions
{
    public static void RegisterElasticApmRedis(this IServiceCollection services)
    {
        services
            .AddSingleton<IDistributedCache>(sp =>
            {
                var profiler = new ElasticApmProfiler(sp.GetService<IApmAgent>);
                var options = new RedisCacheOptions()
                {
                    Configuration = "localhost",
                    ProfilingSession = profiler.GetProfilingSession
                };

                return new RedisCache(options);
            });
    }
}

[cla-checker-service]

💚 CLA has been signed

[ghost]

💚 Build Succeeded

the below badges are clickable and redirect to their specific view in the CI or DOCS

Expand to view the summary

Build stats

• Build Cause: Started by user Russ Cam

• Start Time: 2021-03-22T00:19:29.577+0000

• Duration: 59 min 14 sec

• Commit: b40a7e6

Test stats 🧪

Test	Results
Failed	0
Passed	18759
Skipped	80
Total	18839

Trends 🧪

[glucaci]

I've signed the CLA, must be re-checked

[russcam]

LGTM, thanks @glucaci 👍

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.43%. Comparing base (88a8d64) to head (b40a7e6).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1229      +/-   ##
==========================================
- Coverage   81.47%   81.43%   -0.05%     
==========================================
  Files         165      165              
  Lines        6850     6850              
==========================================
- Hits         5581     5578       -3     
- Misses       1269     1272       +3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.