Lightning Talk: Optimise Your Mesh With Istio Sidecar
summary
GetYourGuide uses the Istio Sidecar resource to limit egress configuration per workload, switching many services to registry-only mode so missing hosts get sent to a “black hole” and are discoverable. Automated metric queries populate egress lists for ~90–95% of cases, then lightweight developer PRs and a runbook complete the rest. A clusterwide rollout across ~300 services in a few weeks yields ~10x faster cluster convergence, eliminates lag-related networking errors, and cuts data-plane CPU/memory by ~60%.
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