Term Kind Topic What it is
Ambassador Pattern pattern Sidecar & Ambassador A helper process that handles outbound network communication on behalf of an application, adding retries, routing, security and telemetry without changing it.
Sidecar Interception Boundary Mesh Coverage Boundary, Proxy Capture Scope concept Sidecar & Ambassador The precise set of traffic a sidecar proxy actually sees and can secure, which is narrower than "all traffic from this pod" and is what decides whether a mesh's guarantees apply to a given call.
Sidecar Resource Overhead concept Sidecar & Ambassador The cumulative CPU, memory and latency cost of running helper containers alongside every application container.