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A monolith runs as one process reaching one database, so a function call between two pieces of business logic never leaves memory, no serialization, no TCP handshake, no timeout to configure.

Every arrow in that microservices diagram is now a network call carrying real failure modes a function call never had, a connection refused because a target pod hasn't finished starting, a request hanging because no timeout was ever configured on that particular client, a downstream 5xx with no defined retry behavior on the caller's side. None of that logic writes itself, and at the infrastructure layer nobody enforces that every service handles it the same way.

Before any mesh technology existed, this logic lived inside each service's own process, wired in through whatever client library that service's runtime happened to use.

Even within a single organization standardized on one runtime, this still meant every team choosing its own circuit breaker thresholds, its own discovery client polling interval, its own metrics exporter, with no platform level guarantee any of it matched. A downstream service under load gets hit differently depending entirely on which upstream happens to be calling it and how that upstream's engineer configured their client three months ago.

A closer look inside a single service from that era shows exactly what accumulated inside the running application.

Discovery meant a client polling a service registry on some interval to find current healthy instances. Resiliency meant circuit breaker thresholds set independently per service, no platform wide default. Metrics meant an exporter pushed to a shared monitoring backend only if that particular team remembered to wire it in during initial development. When the shared discovery or resiliency library needed a version bump for a security fix, that meant a coordinated redeploy across every service depending on it, tracked manually, with no central point of control forcing the upgrade.

Istio's fix pulls those five concerns out of the application process entirely and runs them as Envoy, a separate proxy container injected into the same Pod.

This injection happens through a Kubernetes mutating webhook, enabled per namespace with the label istio-injection=enabled, or per pod with an istio.io/rev annotation for revisioned control plane installs. An init container sets up iptables rules that transparently redirect all inbound and outbound pod traffic through Envoy, outbound on port 15001, inbound on port 15006, so application code needs no awareness of the sidecar's existence. It makes a normal call to a service DNS name and the redirect happens at the network layer beneath it.

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