AL0092 - Consider configuring sampling

High-volume services need sampling to control telemetry costs

Source: Al0092ConsiderSamplingAnalyzer.cs

Description

High-volume services should configure a sampler to control the volume and cost of telemetry data. Without sampling, trace storage costs can grow unbounded.

Bad Code

builder.Services.AddOpenTelemetry()
    .WithTracing(t => t.AddOtlpExporter());
// No sampler configured - defaults to AlwaysOn

Good Code

builder.Services.AddOpenTelemetry()
    .WithTracing(t => t
        .SetSampler(new TraceIdRatioBasedSampler(0.1))
        .AddOtlpExporter());

Properties

• Category: OpenTelemetry
• Severity: Info
• Enabled by default: True
• Code fix available: False

Configuration

dotnet_diagnostic.AL0092.severity = suggestion