The modern DevOps stack in 2025: tools that actually made it vs tools that got replaced

The Modern DevOps Stack in 2025: What Survived and What Got Culled Five years ago, we were drowning in point solutions. Today's DevOps winners consolidated ruthlessly. The survivors: boring wins Kubernetes didn't die—it just stopped being exciting. Everyone's moved past "should we use K8s?" to "how do we stop reinventing it?" Container orchestration matured into infrastructure commodity. Same for Terraform —still the IaC standard because it works and the ecosystem stayed stable. GitOps became religion instead of trend. ArgoCD and Flux ownership solidified. If your CD pipeline isn't declarative and git-driven by now, you're operating at a disadvantage. Observability trio (Prometheus, Grafana, ELK variants) aren't fashionable anymore—they're just assumed. The market shifted from "do we observe?" to "which observability platform doesn't create alert fatigue?" The casualties: complexity killed them Jenkins didn't disappear, but it lost mindshare to GitHub Actions and GitLab CI . Why operat