.NET Modernization & Production Reliability
Modernize the .NET you already have
Legacy .NET rescue, minimal APIs, OpenTelemetry, idempotency keys, correlation IDs, and thread pool diagnostics — production patterns that stop timeouts, stuck jobs, and silent failures, so you can modernize incrementally without the rewrite you don't need.
What you will find here
Production .NET patterns extracted from real incidents: OpenTelemetry tracing, structured logging with Serilog, idempotency keys for APIs, correlation IDs across services, thread pool diagnostics, and legacy .NET rescue techniques. Every article includes code you can adopt incrementally — no full rewrites required.
Who this is for: .NET engineers maintaining production services, migrating legacy frameworks, or building new APIs with minimal APIs, MediatR, and Azure.
Production checklists
Free diagnostic checklists and incident runbooks for .NET production
Code kits
- OpenTelemetry tracing starter kit (.NET)A minimal tracing checklist and attribute map for debugging production incidents in .NET services.
- Idempotency key contract template (.NET)A key format, storage checklist, and replay rules to prevent duplicate side effects in .NET APIs.
- Axiom Module - Retry Policy KitA paid retry policy kit with stop/retry/escalate rules, backoff + jitter defaults, retry budgets/caps, and 429 Retry-After handling templates (Polly + HttpClient) to prevent retry storms.
- Polly Retry Policies packageA small shipped kit for safe Polly retries: C# client wrapper, retry checklist, retry logging schema, and setup notes.
- Timeout matrix template (HTTP / SQL / jobs)A practical worksheet to set request/job budgets, allocate per-dependency timeouts, and define stop rules and logging fields.
Tools
Interactive tools for .NET production engineering
Latest articles
.NET production patterns and troubleshooting guides
Rewrite or modernize? How to decide for your legacy .NET application
The rewrite-or-modernize decision is a business decision, not a code decision. A practical framework for CTOs and engineering leaders running long-lived .NET Framework, Web Forms, or WCF applications — when a rewrite makes sense, when it does not, and how to find out without guessing.
Why your legacy .NET application keeps getting slower (and what to measure first)
Legacy .NET apps slow down for predictable reasons — query bloat, blocking I/O, lock contention, and compounding technical debt. A practical guide for engineering leaders: what to measure first, how to find the real bottlenecks in days, and why "it's just old" is not a diagnosis.
Modular monolith vs microservices: the pragmatic path for legacy .NET
Microservices are not the default destination for a legacy .NET monolith. The modular monolith gets you most of the benefits with a fraction of the risk. A framework for engineering leaders deciding where their legacy application should actually go.
Moving a legacy .NET app to Azure without a rewrite
Cloud migration does not have to mean modernization-by-rewrite. A pragmatic path for moving .NET Framework, Web Forms, or WCF applications to Azure — lift-and-shift first, then modernize incrementally where it reduces risk and cost. What to move, what to re-architect, and what to leave alone.
Adding AI to an existing .NET application without replacing it
You do not need a greenfield build to add AI to your .NET application. A pragmatic path for engineering leaders: augment an existing system with AI capabilities — semantic search, classification, copilots — while preserving the business logic that already works.
Finding and Fixing Memory Leaks in .NET Services on Linux Containers
Your .NET service on Linux consumes more memory every hour until the container OOMs. Diagnose managed and native memory leaks step by step — from metrics and heap dumps to the exact fix. Based on real production incidents.
Diagnosing Thread Pool Starvation in ASP.NET Core Under Production Load
Your ASP.NET Core API slows to a crawl under load while CPU stays low. Diagnose thread pool starvation step by step — from symptoms and metrics to memory dumps and the exact fix. Based on real production incidents.
C# 8 Default Interface Methods & Static Fields: Which Version? Complete Guide with Examples
Which C# version introduced default interface methods and static fields? C# 8.0. Complete reference covering static methods, fields, access modifiers, sealed/virtual members, CLR support, and production use cases with code examples.
Performance triage in legacy .NET: find the top 3 bottlenecks fast
When the legacy system is slow and no one knows where to start, a structured triage finds the real bottlenecks in hours, not weeks. This playbook gives you a repeatable method to identify, rank, and fix the top 3 performance killers.
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