Remove unused builders.
diff --git a/.ci.yaml b/.ci.yaml
index 8f320ae..31e16a1 100644
--- a/.ci.yaml
+++ b/.ci.yaml
@@ -8,6 +8,7 @@
 enabled_branches:
   - main
   - flutter-\d+\.\d+-candidate\.\d+
+  - fuchsia_r48
 
 platform_properties:
   linux:
@@ -107,56 +108,6 @@
       os: Windows-10
 
 targets:
-  - name: Linux Android AOT Engine
-    recipe: engine/engine
-    properties:
-      add_recipes_cq: "true"
-      build_android_aot: "true"
-      android_sdk_license: \n24333f8a63b6825ea9c5514f83c2829b004d1fee
-      android_sdk_preview_license: \n84831b9409646a918e30573bab4c9c91346d8abd
-    timeout: 60
-
-  - name: Linux Android Debug Engine
-    recipe: engine/engine
-    properties:
-      add_recipes_cq: "true"
-      build_android_debug: "true"
-      build_android_jit_release: "true"
-      build_android_vulkan: "true"
-      android_sdk_license: \n24333f8a63b6825ea9c5514f83c2829b004d1fee
-      android_sdk_preview_license: \n84831b9409646a918e30573bab4c9c91346d8abd
-    timeout: 60
-
-  - name: Linux Android Emulator Tests
-    bringup: true # Recipe issue https://github.com/flutter/flutter/issues/86427
-    recipe: engine/scenarios
-    properties:
-      dependencies: >-
-        [
-          {"dependency": "android_virtual_device", "version": "31"}
-        ]
-      upload_packages: "true"
-      clobber: "true"
-    timeout: 60
-
-  - name: Linux Benchmarks
-    enabled_branches:
-      - main
-      - master
-    recipe: engine/engine_metrics
-    presubmit: false
-    properties:
-      build_host: "true"
-      upload_metrics: "true"
-    timeout: 60
-
-  - name: Linux Benchmarks (no-upload)
-    recipe: engine/engine_metrics
-    properties:
-      build_host: "true"
-      upload_metrics: "false"
-    timeout: 60
-
   - name: Linux Fuchsia
     recipe: engine/engine
     properties:
@@ -173,264 +124,3 @@
       fuchsia_ctl_version: version:0.0.27
     timeout: 60
 
-  - name: Linux Framework Smoke Tests
-    recipe: engine/framework_smoke
-    enabled_branches:
-      - main
-      - master
-    timeout: 60
-
-  - name: Linux Host Engine
-    recipe: engine/engine
-    properties:
-      add_recipes_cq: "true"
-      build_host: "true"
-    timeout: 60
-
-  - name: Linux Unopt
-    recipe: engine/engine_unopt
-    properties:
-      add_recipes_cq: "true"
-      clobber: "true"
-    timeout: 60
-
-  - name: Linux clang-tidy
-    recipe: engine/engine_lint
-    properties:
-      add_recipes_cq: "true"
-      cores: "32"
-    timeout: 60
-
-  - name: Linux Arm Host Engine
-    recipe: engine/engine_arm
-    properties:
-      add_recipes_cq: "true"
-      build_host: "true"
-    timeout: 90
-
-  - name: Linux linux_host_engine
-    recipe: engine_v2/engine_v2
-    bringup: true
-    timeout: 60
-    properties:
-      config_name: linux_host_engine
-      environment: Staging
-
-  - name: Linux Web Engine
-    recipe: engine/web_engine
-    properties:
-      add_recipes_cq: "true"
-      gcs_goldens_bucket: flutter_logs
-      dependencies: >-
-        [
-          {"dependency": "goldctl"}
-        ]
-    timeout: 60
-    runIf:
-      - DEPS
-      - .ci.yaml
-      - lib/web_ui/**
-      - web_sdk/**
-      - tools/**
-      - ci/**
-      - flutter_frontend_server/**
-
-  - name: Linux Web Framework tests
-    recipe: engine/web_engine_framework
-    enabled_branches:
-      - main
-      - master
-    properties:
-      add_recipes_cq: "true"
-      dependencies: >-
-        [
-          {"dependency": "chrome_and_driver", "version": "version:96.2"},
-          {"dependency": "curl", "version": "version:7.64.0"}
-        ]
-      framework: "true"
-      shard: web_tests
-      subshards: >-
-              ["0", "1", "2", "3", "4", "5", "6", "7_last"]
-    timeout: 60
-    runIf:
-      - DEPS
-      - .ci.yaml
-      - lib/web_ui/**
-      - web_sdk/**
-      - tools/**
-      - ci/**
-      - flutter_frontend_server/**
-
-  - name: Mac Android AOT Engine
-    recipe: engine/engine
-    properties:
-      android_sdk_license: \n24333f8a63b6825ea9c5514f83c2829b004d1fee
-      android_sdk_preview_license: \n84831b9409646a918e30573bab4c9c91346d8abd
-      build_android_aot: "true"
-      jazzy_version: "0.14.1"
-    timeout: 60
-
-  - name: Mac Host Engine
-    recipe: engine/engine
-    properties:
-      add_recipes_cq: "true"
-      build_host: "true"
-      jazzy_version: "0.14.1"
-    timeout: 75
-
-  - name: Mac Unopt
-    recipe: engine/engine_unopt
-    properties:
-      add_recipes_cq: "true"
-      jazzy_version: "0.14.1"
-    timeout: 75
-
-  - name: Mac clang-tidy
-    recipe: engine/engine_lint
-    properties:
-      add_recipes_cq: "true"
-      jazzy_version: "0.14.1"
-    timeout: 75
-
-  - name: Mac iOS Engine
-    recipe: engine/engine
-    properties:
-      build_ios: "true"
-      ios_debug: "true"
-      jazzy_version: "0.14.1"
-    timeout: 60
-
-  - name: Mac Web Engine
-    recipe: engine/web_engine
-    properties:
-      add_recipes_cq: "true"
-      gcs_goldens_bucket: flutter_logs
-      caches: >-
-        [
-          {"name":"flutter_cocoapods","path":"cocoapods"},
-          {"name":"old_osx_sdk","path":"osx_sdk"},
-          {"name":"builder_mac_engine","path":"builder"},
-          {"name":"openjdk","path":"java"}
-        ]
-      dependencies: >-
-        [
-          {"dependency": "goldctl"}
-        ]
-      os: Mac-10.15
-      runtime_versions: >-
-        [
-        ]
-      xcode: 12c33 # xcode 12.3
-    timeout: 60
-    runIf:
-      - DEPS
-      - .ci.yaml
-      - lib/web_ui/**
-      - web_sdk/**
-      - tools/**
-      - ci/**
-      - flutter_frontend_server/**
-
-  - name: Mac mac_ios_engine
-    recipe: engine_v2/engine_v2
-    bringup: true
-    timeout: 60
-    properties:
-      config_name: mac_ios_engine
-      environment: Staging
-      dependencies: >-
-        [
-          {"dependency": "jazzy", "version": "0.14.1"}
-        ]
-
-  - name:  Mac mac_ios_engine_profile
-    recipe: engine_v2/engine_v2
-    bringup: true
-    timeout: 60
-    properties:
-      config_name: mac_ios_engine_profile
-      environment: Staging
-
-  - name:  Mac mac_ios_engine_release
-    recipe: engine_v2/engine_v2
-    bringup: true
-    timeout: 60
-    properties:
-      config_name: mac_ios_engine_release
-      environment: Staging
-
-  - name: Windows Android AOT Engine
-    recipe: engine/engine
-    properties:
-      build_android_aot: "true"
-      android_sdk_license: \n24333f8a63b6825ea9c5514f83c2829b004d1fee
-      android_sdk_preview_license: \n84831b9409646a918e30573bab4c9c91346d8abd
-    timeout: 60
-
-  - name: Windows Host Engine
-    recipe: engine/engine
-    timeout: 60
-    properties:
-      add_recipes_cq: "true"
-      build_host: "true"
-
-  - name: Windows windows_android_aot_engine
-    recipe: engine_v2/engine_v2
-    bringup: true
-    timeout: 60
-    properties:
-      config_name: windows_android_aot_engine
-      environment: Staging
-
-  - name: Windows windows_host_engine
-    recipe: engine_v2/engine_v2
-    bringup: true
-    timeout: 60
-    properties:
-      config_name: windows_host_engine
-      environment: Staging
-
-  - name: Windows Unopt
-    recipe: engine/engine_unopt
-    properties:
-      add_recipes_cq: "true"
-    timeout: 75
-
-  - name: Windows UWP Engine
-    recipe: engine/engine
-    properties:
-      build_windows_uwp: "true"
-    timeout: 60
-
-  - name: Windows Web Engine
-    recipe: engine/web_engine
-    properties:
-      gcs_goldens_bucket: flutter_logs
-    timeout: 60
-    runIf:
-      - DEPS
-      - .ci.yaml
-      - lib/web_ui/**
-      - web_sdk/**
-
-  - name: Mac iOS Engine Profile
-    presubmit: false
-    recipe: engine/engine
-    properties:
-      build_ios: "true"
-      ios_profile: "true"
-      jazzy_version: "0.14.1"
-    timeout: 90
-
-  - name: Mac iOS Engine Release
-    presubmit: false
-    recipe: engine/engine
-    properties:
-      build_ios: "true"
-      ios_release: "true"
-      jazzy_version: "0.14.1"
-    timeout: 90
-
-  - name: Linux ci_yaml engine roller
-    bringup: true
-    recipe: infra/ci_yaml