ASP.NET Core Metrics Dashboard

Monitor ASP.NET Core application performance across five areas: HTTP request throughput and latency, process memory, GC and heap health, thread pool, and routing.

What This Dashboard Monitors

• Request & Response: HTTP request rate, latency percentiles (P50/P95/P99), active requests, and error breakdown by route
• Process: Working set memory and CPU time
• GC & Memory: Collection counts by generation (Gen0/Gen1/Gen2), total allocated bytes, heap size and fragmentation, GC pause time, and committed memory
• Threading & Exceptions: Thread pool thread count, queue length, work item throughput, and exceptions by type
• Routing & Memory Pool: Route match success and failure rates; Kestrel memory pool rental, allocation, pooling, and eviction (.NET 10+ only)

Metrics Included

Request & Response

• HTTP Request Duration: Shows request latency percentiles (P50, P95, P99) over time
• Active Requests: Shows in-flight HTTP requests over time
• Kestrel Active Connections: Shows open Kestrel connections over time
• Kestrel Connection Duration: Shows Kestrel connection lifetime over time

Process

• Memory Working Set: Shows process working set over time
• CPU Time: Shows CPU time consumed by state over time

GC & Memory

• GC Collections: Shows garbage collection counts by generation (Gen0, Gen1, Gen2) over time
• Heap Total Allocated: Shows total bytes allocated on the managed heap over time
• Heap Size After GC: Shows heap size after the last collection over time
• Committed Memory: Shows memory committed after the last collection over time
• Heap Fragmentation: Shows heap fragmentation after the last collection over time
• GC Pause Time: Shows time spent in GC pause over time

Threading & Exceptions

• Thread Pool Thread Count: Shows the number of active thread pool threads over time
• Thread Pool Queue Length: Shows the work queue length over time
• Work Items Completed: Shows thread pool work items completed over time
• Exceptions: Shows exceptions thrown over time, grouped by error.type

Routing & Memory Pool

• Route Match Attempts: Shows route match attempts grouped by status (success / failure) over time
• Memory Pool Rented: Shows bytes rented from the Kestrel memory pool over time
• Memory Pool Allocated: Shows bytes allocated from the OS for the pool over time
• Memory Pool Pooled: Shows bytes currently held in the pool over time
• Memory Pool Evicted: Shows bytes evicted from the pool over time

Dashboard Variables

• deployment.environment: Filter by deployment environment. Set by adding OTEL_RESOURCE_ATTRIBUTES=deployment.environment=<value> to your application's environment.
• service.name: Filter by service name. Populated from OTEL_SERVICE_NAME.

The variables cascade: picking an environment narrows the service name dropdown to services running in that environment.

Related Dashboards

• Go Runtime Metrics
• JVM Metrics
• APM Metrics