diff --git a/.ci/generate-buildkite-pipeline-premerge b/.ci/generate-buildkite-pipeline-premerge
deleted file mode 100755
index 5e5f916f35b7..000000000000
--- a/.ci/generate-buildkite-pipeline-premerge
+++ /dev/null
@@ -1,131 +0,0 @@
-#!/usr/bin/env bash
-#===----------------------------------------------------------------------===##
-#
-# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-# See https://llvm.org/LICENSE.txt for license information.
-# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-#
-#===----------------------------------------------------------------------===##
-
-#
-# This file generates a Buildkite pipeline that triggers the various CI jobs for
-# the LLVM project during pre-commit CI.
-#
-# See https://buildkite.com/docs/agent/v3/cli-pipeline#pipeline-format.
-#
-# As this outputs a yaml file, it's possible to log messages to stderr or
-# prefix with "#".
-
-
-set -eu
-set -o pipefail
-
-# Environment variables script works with:
-
-# Set by buildkite
-: ${BUILDKITE_PULL_REQUEST_BASE_BRANCH:=}
-: ${BUILDKITE_COMMIT:=}
-: ${BUILDKITE_BRANCH:=}
-# Fetch origin to have an up to date merge base for the diff.
-git fetch origin
-# List of files affected by this commit
-: ${MODIFIED_FILES:=$(git diff --name-only origin/${BUILDKITE_PULL_REQUEST_BASE_BRANCH}...HEAD)}
-# Filter rules for generic windows tests
-: ${WINDOWS_AGENTS:='{"queue": "windows"}'}
-# Filter rules for generic linux tests
-: ${LINUX_AGENTS:='{"queue": "linux"}'}
-
-reviewID="$(git log --format=%B -n 1 | sed -nE 's/^Review-ID:[[:space:]]*(.+)$/\1/p')"
-if [[ "${reviewID}" != "" ]]; then
-  buildMessage="https://llvm.org/${reviewID}"
-else
-  buildMessage="Push to branch ${BUILDKITE_BRANCH}"
-fi
-
-cat <<EOF
-steps:
-EOF
-
-echo "Files modified:" >&2
-echo "$MODIFIED_FILES" >&2
-modified_dirs=$(echo "$MODIFIED_FILES" | cut -d'/' -f1 | sort -u)
-echo "Directories modified:" >&2
-echo "$modified_dirs" >&2
-
-# Project specific pipelines.
-
-# If libc++ or one of the runtimes directories changed.
-if echo "$modified_dirs" | grep -q -E "^(libcxx|libcxxabi|libunwind|runtimes|cmake)$"; then
-  cat <<EOF
-- trigger: "libcxx-ci"
-  build:
-    message: "${buildMessage}"
-    commit: "${BUILDKITE_COMMIT}"
-    branch: "${BUILDKITE_BRANCH}"
-EOF
-fi
-
-# Generic pipeline for projects that have not defined custom steps.
-#
-# Individual projects should instead define the pre-commit CI tests that suits their
-# needs while letting them run on the infrastructure provided by LLVM.
-
-# Figure out which projects need to be built on each platform
-source <(git diff --name-only origin/${BUILDKITE_PULL_REQUEST_BASE_BRANCH}...HEAD | python3 .ci/compute_projects.py Linux)
-linux_projects=${projects_to_build}
-linux_check_targets=${project_check_targets}
-linux_runtimes=${runtimes_to_build}
-linux_runtime_check_targets=${runtimes_check_targets}
-
-source <(git diff --name-only origin/${BUILDKITE_PULL_REQUEST_BASE_BRANCH}...HEAD | python3 .ci/compute_projects.py Windows)
-windows_projects=${projects_to_build}
-windows_check_targets=${project_check_targets}
-
-
-# Generate the appropriate pipeline
-if [[ "${linux_projects}" != "" ]]; then
-  cat <<EOF
-- label: ':linux: Linux x64'
-  artifact_paths:
-  - 'artifacts/**/*'
-  - '*_result.json'
-  - 'build/test-results.*.xml'
-  agents: ${LINUX_AGENTS}
-  retry:
-    automatic:
-      - exit_status: -1  # Agent was lost
-        limit: 2
-      - exit_status: 255 # Forced agent shutdown
-        limit: 2
-  timeout_in_minutes: 120
-  env:
-    CC: 'clang'
-    CXX: 'clang++'
-  commands:
-  - './.ci/monolithic-linux.sh "$(echo ${linux_projects} | tr ' ' ';')" "$(echo ${linux_check_targets})" "$(echo ${linux_runtimes} | tr ' ' ';')" "$(echo ${linux_runtime_check_targets})"'
-EOF
-fi
-
-if [[ "${windows_projects}" != "" ]]; then
-  cat <<EOF
-- label: ':windows: Windows x64'
-  artifact_paths:
-  - 'artifacts/**/*'
-  - '*_result.json'
-  - 'build/test-results.*.xml'
-  agents: ${WINDOWS_AGENTS}
-  retry:
-    automatic:
-      - exit_status: -1  # Agent was lost
-        limit: 2
-      - exit_status: 255 # Forced agent shutdown
-        limit: 2
-  timeout_in_minutes: 150
-  env:
-    MAX_PARALLEL_COMPILE_JOBS: '16'
-    MAX_PARALLEL_LINK_JOBS: '4'
-  commands:
-  - 'C:\\BuildTools\\Common7\\Tools\\VsDevCmd.bat -arch=amd64 -host_arch=amd64'
-  - 'bash .ci/monolithic-windows.sh "$(echo ${windows_projects} | tr ' ' ';')" "$(echo ${windows_check_targets})"'
-EOF
-fi
diff --git a/.ci/generate_test_report_buildkite.py b/.ci/generate_test_report_buildkite.py
deleted file mode 100644
index 82bbc6d1d32d..000000000000
--- a/.ci/generate_test_report_buildkite.py
+++ /dev/null
@@ -1,57 +0,0 @@
-# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-# See https://llvm.org/LICENSE.txt for license information.
-# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-"""Script to generate a build report for buildkite."""
-
-import argparse
-import os
-import subprocess
-
-import generate_test_report_lib
-
-
-if __name__ == "__main__":
-    parser = argparse.ArgumentParser()
-    parser.add_argument(
-        "title", help="Title of the test report, without Markdown formatting."
-    )
-    parser.add_argument("context", help="Annotation context to write to.")
-    parser.add_argument("return_code", help="The build's return code.", type=int)
-    parser.add_argument("junit_files", help="Paths to JUnit report files.", nargs="*")
-    args = parser.parse_args()
-
-    # All of these are required to build a link to download the log file.
-    env_var_names = [
-        "BUILDKITE_ORGANIZATION_SLUG",
-        "BUILDKITE_PIPELINE_SLUG",
-        "BUILDKITE_BUILD_NUMBER",
-        "BUILDKITE_JOB_ID",
-    ]
-    buildkite_info = {k: v for k, v in os.environ.items() if k in env_var_names}
-    if len(buildkite_info) != len(env_var_names):
-        buildkite_info = None
-
-    report, style = generate_test_report_lib.generate_report_from_files(
-        args.title, args.return_code, args.junit_files, buildkite_info
-    )
-
-    if report:
-        p = subprocess.Popen(
-            [
-                "buildkite-agent",
-                "annotate",
-                "--context",
-                args.context,
-                "--style",
-                style,
-            ],
-            stdin=subprocess.PIPE,
-            stderr=subprocess.PIPE,
-            universal_newlines=True,
-        )
-
-        # The report can be larger than the buffer for command arguments so we send
-        # it over stdin instead.
-        _, err = p.communicate(input=report)
-        if p.returncode:
-            raise RuntimeError(f"Failed to send report to buildkite-agent:\n{err}")
diff --git a/.ci/monolithic-linux.sh b/.ci/monolithic-linux.sh
index c350a5867914..89447963b852 100755
--- a/.ci/monolithic-linux.sh
+++ b/.ci/monolithic-linux.sh
@@ -42,14 +42,9 @@ function at-exit {
 
   # If building fails there will be no results files.
   shopt -s nullglob
-  if command -v buildkite-agent 2>&1 >/dev/null
-  then
-    python3 "${MONOREPO_ROOT}"/.ci/generate_test_report_buildkite.py ":linux: Linux x64 Test Results" \
-      "linux-x64-test-results" $retcode "${BUILD_DIR}"/test-results.*.xml
-  else
-    python3 "${MONOREPO_ROOT}"/.ci/generate_test_report_github.py ":penguin: Linux x64 Test Results" \
-      $retcode "${BUILD_DIR}"/test-results.*.xml >> $GITHUB_STEP_SUMMARY
-  fi
+  
+  python3 "${MONOREPO_ROOT}"/.ci/generate_test_report_github.py ":penguin: Linux x64 Test Results" \
+    $retcode "${BUILD_DIR}"/test-results.*.xml >> $GITHUB_STEP_SUMMARY
 }
 trap at-exit EXIT
 
diff --git a/.ci/monolithic-windows.sh b/.ci/monolithic-windows.sh
index a0997420b0d3..dc2913830e92 100755
--- a/.ci/monolithic-windows.sh
+++ b/.ci/monolithic-windows.sh
@@ -37,14 +37,9 @@ function at-exit {
 
   # If building fails there will be no results files.
   shopt -s nullglob
-  if command -v buildkite-agent 2>&1 >/dev/null
-  then
-    python "${MONOREPO_ROOT}"/.ci/generate_test_report_buildkite.py ":windows: Windows x64 Test Results" \
-      "windows-x64-test-results" $retcode "${BUILD_DIR}"/test-results.*.xml
-  else
-    python "${MONOREPO_ROOT}"/.ci/generate_test_report_github.py ":window: Windows x64 Test Results" \
-      $retcode "${BUILD_DIR}"/test-results.*.xml >> $GITHUB_STEP_SUMMARY
-  fi
+    
+  python "${MONOREPO_ROOT}"/.ci/generate_test_report_github.py ":window: Windows x64 Test Results" \
+    $retcode "${BUILD_DIR}"/test-results.*.xml >> $GITHUB_STEP_SUMMARY
 }
 trap at-exit EXIT