Olisen StudioBlog
Kubernetes HPA Scale-to-Zero: When Idle Savings Break Latency and Reliability
A practical look at scale-to-zero in Kubernetes 1.37: metric requirements, end-to-end wake-up latency, the real conditions for savings, KEDA and managed-platform comparisons, failure modes, and a validation plan before production rollout.
Kubernetes 1.37 Memory QoS: Why cgroups v2 Do Not Automatically Protect SaaS from Memory Pressure
What actually changes after upgrading to Kubernetes 1.37, how memory.high, memory.min, and memory.low affect latency and OOM behavior, and how to safely test Memory QoS under real workloads.
Kafka Over the Public Internet in Google Cloud: Security, Architecture, and the Real Cost of Access
Public access to Google Cloud Managed Service for Apache Kafka simplifies connectivity for external clients, but adds CIDR management, DNS, identities, ACLs, observability, and internet-traffic costs. Learn when it is justified and when private connectivity through PSC remains the better choice.
Database Upgrade Debt: How “If It Works, Don’t Touch It” Turns a Database into a Business Risk
A practical article for founders, CTOs, and engineering leaders on why old PostgreSQL, MySQL, MariaDB, and MongoDB versions are not harmless infrastructure debt — and how to build a regular database upgrade process without heroic migrations.
Why your server is running but the product isn't
Most teams monitor servers, databases, and application availability. Yet, the costliest incidents often occur elsewhere entirely. An expired API key, a broken webhook, or an external service failure can go unnoticed for weeks—until users start complaining. Let’s explore why this happens and why traditional monitoring often fails to detect the real issues facing SaaS products