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diff --git a/afdo_tools/update_kernel_afdo b/afdo_tools/update_kernel_afdo
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+#!/bin/bash
+# Copyright 2020 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# Due to crbug.com/1081332, we need to update AFDO metadata
+# manually. This script performs a few checks and generates a
+# new kernel_afdo.json file, which can then be committed.
+#
+# USAGE:
+# toolchain-utils$ ./afdo_tools/update_kernel_afdo
+#
+# The script modifies the JSON file and shows the git diff.
+#
+# If the changes look good, git commit them. Example commit
+# message (from crrev.com/c/2197462):
+#
+#   afdo_metadata: Publish the new kernel profiles
+#
+#   Update chromeos-kernel-3_18 to R84-13080.0-1589189810
+#   Update chromeos-kernel-4_4 to R84-13080.0-1589189726
+#   Update chromeos-kernel-4_14 to R84-13080.0-1589190025
+#   Update chromeos-kernel-4_19 to R84-13080.0-1589189550
+#
+#   BUG=None
+#   TEST=Verified in kernel-release-afdo-verify-orchestrator.
+#
+
+set -eu
+set -o pipefail
+
+CROS_REPO=https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay
+GS_BASE=gs://chromeos-prebuilt/afdo-job/vetted/kernel
+KVERS="3.18 4.4 4.14 4.19"
+errs=""
+successes=0
+
+script_dir=$(dirname "$0")
+tc_utils_dir="$script_dir/.."
+metadata_dir="$tc_utils_dir/afdo_metadata"
+outfile="$metadata_dir/kernel_afdo.json"
+
+# The most recent Monday, in Unix timestamp format.
+if [ $(date +%a) = "Mon" ]
+then
+  expected_time=$(date +%s -d 00:00:00)
+else
+  expected_time=$(date +%s -d "last Monday")
+fi
+
+# Get the current canary branch number (using beta + 1)
+beta=$(git ls-remote -h $CROS_REPO | \
+       sed -n -e "s/^.*release-R\([0-9][0-9]*\).*$/\1/p" | \
+       sort -g | tail -1)
+canary="$(($beta + 1))"
+
+json="{"
+sep=""
+for kver in $KVERS
+do
+  # Sort the gs output by timestamp (default ordering is by name, so
+  # R86-13310.3-1594633089.gcov.xz goes after R86-13310.18-1595237847.gcov.xz)
+  latest=$(gsutil.py ls -l "$GS_BASE/$kver/" | sort -k2 | \
+           grep "R${canary}" | tail -1 || true)
+  if [ -z "$latest" ]
+  then
+    # if no profiles exist for R${canary}, try the previous branch
+    latest=$(gsutil.py ls -l "$GS_BASE/$kver/" | sort -k2 | \
+             grep "R${beta}" | tail -1)
+  fi
+
+  # Verify that the file has the expected date.
+  file_time=$(echo "$latest" | awk '{print $2}')
+  file_time_unix=$(date +%s -d "$file_time")
+  if [ $file_time_unix -lt $expected_time ]
+  then
+    expected=$(env TZ=UTC date +%Y-%m-%dT%H:%M:%SZ -d @$expected_time)
+    echo "Wrong date for $kver: $file_time is before $expected" >&2
+    errs="$errs $kver"
+    continue
+  fi
+
+  # Generate JSON.
+  json_kver=$(echo "$kver" | tr . _)
+  # b/147370213 (migrating profiles from gcov format) may result in the
+  # pattern below no longer doing the right thing.
+  name=$(echo "$latest" | sed 's%.*/\(.*\)\.gcov.*%\1%')
+  json=$(cat <<EOT
+$json$sep
+    "chromeos-kernel-$json_kver": {
+        "name": "$name"
+    }
+EOT
+)
+  sep=","
+  successes=$((successes + 1))
+done
+
+# If we did not succeed for any kvers, exit now.
+if [ $successes -eq 0 ]
+then
+  echo "error: AFDO profiles out of date for all kernel versions" >&2
+  exit 2
+fi
+
+# Write new JSON file.
+printf "%s\n}\n" "$json" > "$outfile"
+
+# Show the changes.
+(cd "$tc_utils_dir" && git diff)
+
+# If no changes were made, say so.
+outdir=$(dirname "$outfile")
+shortstat=$(cd "$outdir" && git status --short $(basename "$outfile"))
+[ -n "$shortstat" ] || echo $(basename "$outfile")" is up to date."
+
+# If we had any errors, warn about them.
+[ -z "$errs" ] || echo "warning: failed to update$errs" >&2