Profiling a Slow Endpoint: Flame Graph to Fix, On-CPU vs Off-CPU
Learn to diagnose a slow monolith endpoint: scope the problem, use APM traces, pick on-CPU or wall-clock profiling, read flame graphs, and fix N+1 queries.
16 min read
Category
Monoliths & Modular Monoliths
When one deployable is the right answer, how to structure it, and how to migrate in either direction.
Speed Up Monolith Startup with Lazy Module Loading: A Practical Guide
Learn how to profile application boot time, defer modules safely, keep readiness honest, and weigh lazy loading against first-request latency and late failures.
14 min read
In-Process Event Bus in a Monolith: Domain Events Done Right
Design an in-process event bus for a modular monolith: domain events, in-transaction vs after-commit handlers, outbox durability, boundaries and testing.
14 min read
Rate Limiting a Monolith Without Redis: In-Memory vs Postgres
Compare in-memory and Postgres rate limiters for a monolith: algorithms, atomic SQL, process-count pitfalls, failure modes, and how to choose by topology.
14 min read
Audit Logging in a Monolith: Triggers vs App Events vs CDC
Compare Postgres audit triggers, application events and change data capture for audit logging in a monolith, with audit table design and a hybrid pattern.
14 min read
Monolith CI by Module: Selective Tests From a Dependency Graph
Cut build time in a monolith repo by selecting CI work per module from a checked-in dependency graph, with path filters, safety nets and required checks handled.
13 min read
How to Remove Dead Code from a Monolith Safely Using Usage Telemetry
Learn a staged, telemetry-driven process to find and remove dead code in a large monolith: detect unused endpoints, add tombstones, deprecate, flag, then delete.
17 min read
Code Ownership in a Monolith: CODEOWNERS and Module Owners at Scale
Learn how to build a module ownership map for a monolith, generate and validate CODEOWNERS from it, and route reviews without blocking large changes.
13 min read
How to Speed Up a Monolith Test Suite: Parallel Tests and Module Splits
Profile a slow monolith test suite, fix shared state so parallel tests are safe, then split by module and timing data without making flaky tests faster.
16 min read
How to Deploy a Monolith Frequently Without Splitting Services
Learn how trunk based development, fast pipelines, safe migrations and release safety let you deploy a monolith frequently, even daily, before splitting it.
13 min read
Feature Flags in a Monolith: Trunk-Based Rollouts Without Branches
How to use feature flags in a monolith for trunk-based development: flag types, evaluation points, gradual rollout, schema changes, testing and flag cleanup.
13 min read
How to Scale a Monolith Horizontally: State, Locks and Cron Jobs
A checklist for running multiple instances of a monolith: find hidden shared state, replace in-process locks, and stop cron jobs from running once per instance.
14 min read