# Istio operator code overview

## Introduction

This document covers primarily the code, with some background on how the design maps to it.
See the
[design doc](https://docs.google.com/document/d/11j9ZtYWNWnxQYnZy8ayZav1FMwTH6F6z6fkDYZ7V298/edit#heading=h.qex63c29z2to)
for a more complete design description. The operator code is divided roughly into five areas:

1. [IstioOperatorSpec API](#istiooperatorspec-api) and related infrastructure, which is expressed as a

  // evictions by specifying "100%".
  // +optional
  optional k8s.io.apimachinery.pkg.util.intstr.IntOrString minAvailable = 1;

  // Label query over pods whose evictions are managed by the disruption
  // budget.
  // A null selector selects no pods.
  // An empty selector ({}) also selects no pods, which differs from standard behavior of selecting all pods.

                "uid": "${datasource}"
              },
              "expr": "pilot_conflict_outbound_listener_tcp_over_current_tcp{app=\"istiod\"}",
              "format": "time_series",
              "hide": false,
              "intervalFactor": 1,
              "legendFormat": "Outbound Listeners (tcp over current tcp)",
              "refId": "C"
            }
          ],
          "title": "Conflicts",