Jenkins -> GitHub Actions, GitLab CI, Buildkite, Tekton
Simpler pipelines, managed runners, and better supply-chain security support.
Chef/Puppet -> Ansible, Kubernetes Operators, Immutable images
Less drift and a cleaner fit for cloud-native workloads.
Prometheus-only observability -> Grafana Cloud, Datadog, Honeycomb, OpenTelemetry-first stacks
Faster traces/logs/metrics correlation, with cost and lock-in as the main tradeoffs.
Terraform-only IaC -> OpenTofu, Pulumi, Crossplane
Gives you a hedge across licensing, programming model, and Kubernetes-native control planes.