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• GitOps has clear advantages over traditional CI/CD tools, but scaling observability and deployment automation can be challenging
• Open-source tools like ClusterAPI, ArgoCD, and Prometheus+Thanos can help manage and organize deployments
• The presentation proposes using immutable clusters treated as always stamped out of a template to address the fear of upgrading
• The ClusterAPI project can be used to declaratively express the idea of a cluster and interact with different cloud providers
• The v-cluster project can be used to create ephemeral clusters that live inside management clusters and can be used when provisioning time is a crucial parameter
• The presentation emphasizes the importance of monitoring ephemeral clusters and collecting metrics from them
• The use of open-source tools can automate the deployment of hundreds of clusters and applications automatically and securely

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• Istio service mesh is important for resource-saving and identity isolation in multi-tenancy models
• Recent enhancements make it easy to configure using the revisions feature and discovery selectors
• Multiple control planes allow for separate versions and lifecycle management for different applications
• Mixed multi-tenancy models are possible depending on the organization's requirements
• Argo CD can be used for deploying and syncing resources in the cluster

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• Cluster API and Tinkerbell can be used to deploy Kubernetes on bare metal.
• GitHub's can be used to define the desired state of the infrastructure and introduce automation.
• Argo CD and Helm can be used to manage and apply changes to the infrastructure.
• Introducing templating and automation can simplify the management of multiple clusters.

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• An experienced engineer made a mistake in the root file of the templating system, which was missed by a senior engineer during review
• Skyscanner promotes a blameless attitude towards incidents and emphasizes the importance of a blameless culture
• Incident management involves all responsible parties, including legal and user satisfaction teams
• The incident commander role is crucial in coordinating technical and non-technical teams during an incident
• Restoring services after an incident can be complicated and time-consuming

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• Background on managing microservices with Kubernetes
• Challenges with managing resources and observability
• Solution: GitOps to manage resources and secrets
• Introduction to argocd-vault-plugin
• Benefits of using argocd-vault-plugin for secret management
• Anecdote: Challenges with manual management of resources and secrets