diff --git a/.cookiecutter-replay.json b/.cookiecutter-replay.json
index add4eb4..b79463c 100644
--- a/.cookiecutter-replay.json
+++ b/.cookiecutter-replay.json
@@ -8,6 +8,7 @@
     "keywords": "cloud, microgrid",
     "github_org": "frequenz-floss",
     "license": "MIT",
+    "private_repo": "no",
     "author_name": "Frequenz Energy-as-a-Service GmbH",
     "author_email": "floss@frequenz.com",
     "python_package": "frequenz.api.reporting",
@@ -35,6 +36,10 @@
       "MIT",
       "Proprietary"
     ],
+    "private_repo": [
+      "{{ 'yes' if cookiecutter.license == 'Proprietary' else 'no' }}",
+      "{{ 'no' if cookiecutter.license == 'Proprietary' else 'yes' }}"
+    ],
     "author_name": "Frequenz Energy-as-a-Service GmbH",
     "author_email": "floss@frequenz.com",
     "python_package": "{{cookiecutter | python_package}}",
diff --git a/.github/containers/nox-cross-arch/arm64-ubuntu-20.04-python-3.11.Dockerfile b/.github/containers/nox-cross-arch/arm64-ubuntu-20.04-python-3.11.Dockerfile
deleted file mode 100644
index 4a29eec..0000000
--- a/.github/containers/nox-cross-arch/arm64-ubuntu-20.04-python-3.11.Dockerfile
+++ /dev/null
@@ -1,33 +0,0 @@
-# License: MIT
-# Copyright © 2024 Frequenz Energy-as-a-Service GmbH
-# This Dockerfile is used to run the tests in arm64, which is not supported by
-# GitHub Actions at the moment.
-
-FROM docker.io/library/ubuntu:20.04
-
-ENV DEBIAN_FRONTEND=noninteractive
-
-# Install Python 3.11 and curl to install pip later
-RUN apt-get update -y && \
-    apt-get install --no-install-recommends -y \
-        software-properties-common && \
-    add-apt-repository ppa:deadsnakes/ppa && \
-    apt-get install --no-install-recommends -y \
-        ca-certificates \
-        curl \
-        git \
-        python3.11 \
-        python3.11-distutils && \
-    apt-get clean && \
-    rm -rf /var/lib/apt/lists/*
-
-# Install pip
-RUN curl -sS https://bootstrap.pypa.io/get-pip.py | python3.11
-
-RUN update-alternatives --install \
-        /usr/local/bin/python python /usr/bin/python3.11 1 && \
-    python -m pip install --upgrade --no-cache-dir pip
-
-COPY entrypoint.bash /usr/bin/entrypoint.bash
-
-ENTRYPOINT ["/usr/bin/entrypoint.bash"]
diff --git a/.github/containers/nox-cross-arch/entrypoint.bash b/.github/containers/nox-cross-arch/entrypoint.bash
deleted file mode 100755
index f344deb..0000000
--- a/.github/containers/nox-cross-arch/entrypoint.bash
+++ /dev/null
@@ -1,9 +0,0 @@
-#!/bin/bash
-# License: MIT
-# Copyright © 2024 Frequenz Energy-as-a-Service GmbH
-set -e
-
-echo "System details:" $(uname -a)
-echo "Machine:" $(uname -m)
-
-exec "$@"
diff --git a/.github/containers/test-installation/Dockerfile b/.github/containers/test-installation/Dockerfile
deleted file mode 100644
index d5e2399..0000000
--- a/.github/containers/test-installation/Dockerfile
+++ /dev/null
@@ -1,20 +0,0 @@
-# License: MIT
-# Copyright © 2023 Frequenz Energy-as-a-Service GmbH
-# This Dockerfile is used to test the installation of the python package in
-# multiple platforms in the CI. It is not used to build the package itself.
-
-FROM python:3.11-slim
-
-RUN apt-get update -y && \
-    apt-get install --no-install-recommends -y \
-    git && \
-    apt-get clean && \
-    rm -rf /var/lib/apt/lists/* && \
-    python -m pip install --upgrade --no-cache-dir pip
-
-COPY dist dist
-# This git-credentials file is made available by the GitHub ci.yaml workflow
-COPY git-credentials /root/.git-credentials
-RUN git config --global credential.helper store && \
-    pip install dist/*.whl && \
-    rm -rf dist /root/.git-credentials
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 2147f7e..8180d70 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -29,6 +29,12 @@ updates:
         exclude-patterns:
           # pydoclint has shipped breaking changes in patch updates often
           - "pydoclint"
+          # These need a migration script to fix Dependabot not updating the
+          # runtime dependencies
+          - "grpcio"
+          - "grpcio-tools"
+          - "protobuf"
+          - "isort"
       minor:
         update-types:
           - "minor"
@@ -48,6 +54,7 @@ updates:
           - "protobuf"
           - "pydoclint"
           - "pytest-asyncio"
+          - "isort"
       # We group repo-config updates as it uses optional dependencies that are
       # considered different dependencies otherwise, and will create one PR for
       # each if we don't group them.
@@ -63,10 +70,28 @@ updates:
       # We group grpcio and protobuf updates together, as they need special
       # handling on the pyproject.toml file because of the protobuf/grpcio
       # build/runtime cross-version guarantees
-      grpc:
+      # We group grpcio and protobuf updates together, as they need special
+      # handling on the pyproject.toml file because of the protobuf/grpcio
+      # build/runtime cross-version guarantees and wrong dependabot handling
+      # of build/runtime dependencies.
+      grpc-compatible:
+        update-types:
+          - "patch"
+          - "minor"
+        patterns:
+          - "grpcio"
+          - "grpcio-tools"
+          - "protobuf"
+      # For major updates we split it up. It was observed in the past that
+      # grpcio releases lag behind protobuf releases, and they are not
+      # compatible with a major protobuf update for a while, so we shouldn't
+      # block the update of one with the other.
+      grpcio-major:
         patterns:
           - "grpcio"
           - "grpcio-tools"
+      protobuf-major:
+        patterns:
           - "protobuf"
 
   - package-ecosystem: "github-actions"
diff --git a/.github/workflows/auto-dependabot.yaml b/.github/workflows/auto-dependabot.yaml
index 65935f7..ae9d968 100644
--- a/.github/workflows/auto-dependabot.yaml
+++ b/.github/workflows/auto-dependabot.yaml
@@ -12,7 +12,9 @@ on:
   pull_request_target:
 
 permissions:
+  # Read repository contents and Dependabot metadata used by the nested action.
   contents: read
+  # The nested action also uses `github.token` internally for PR operations.
   pull-requests: write
 
 jobs:
@@ -20,7 +22,12 @@ jobs:
     name: Auto-merge Dependabot PR
     if: >
       github.actor == 'dependabot[bot]' &&
-      !contains(github.event.pull_request.title, 'the repo-config group')
+      !contains(github.event.pull_request.title, 'the repo-config group') &&
+      !contains(github.event.pull_request.title, 'the grpc-compatible group') &&
+      !contains(github.event.pull_request.title, 'the grpcio-major group') &&
+      !contains(github.event.pull_request.title, 'the protobuf-major group') &&
+      !contains(github.event.pull_request.title, 'Bump black from ') &&
+      !contains(github.event.pull_request.title, 'Bump isort from ')
     runs-on: ubuntu-slim
     steps:
       - name: Generate GitHub App token
@@ -29,6 +36,12 @@ jobs:
         with:
           app-id: ${{ secrets.FREQUENZ_AUTO_DEPENDABOT_APP_ID }}
           private-key: ${{ secrets.FREQUENZ_AUTO_DEPENDABOT_APP_PRIVATE_KEY }}
+          # Merge Dependabot PRs.
+          permission-contents: write
+          # Create the auto-merged label if it does not exist.
+          permission-issues: write
+          # Approve PRs, add labels, and enable auto-merge.
+          permission-pull-requests: write
 
       - name: Auto-merge Dependabot PR
         uses: frequenz-floss/dependabot-auto-approve@e943399cc9d76fbb6d7faae446cd57301d110165 # v1.5.0
diff --git a/.github/workflows/black-migration.yaml b/.github/workflows/black-migration.yaml
new file mode 100644
index 0000000..0013d70
--- /dev/null
+++ b/.github/workflows/black-migration.yaml
@@ -0,0 +1,89 @@
+# Automatic black formatting migration for Dependabot PRs
+#
+# When Dependabot upgrades black, this workflow installs the new version
+# and runs `black .` so the PR already contains any formatting changes
+# introduced by the upgrade, while leaving the PR open for review.
+#
+# Black uses calendar versioning.  Only the first release of a new calendar
+# year may introduce formatting changes (major bump in Dependabot's terms).
+# Minor and patch updates within a year keep formatting stable, so they stay
+# in the regular Dependabot groups and are auto-merged normally.
+#
+# The companion auto-dependabot workflow skips major black PRs so they're
+# handled exclusively by this migration workflow.
+#
+# XXX: !!! SECURITY WARNING !!!
+# pull_request_target has write access to the repo, and can read secrets.
+# This is required because Dependabot PRs are treated as fork PRs: the
+# GITHUB_TOKEN is read-only and secrets are unavailable with a plain
+# pull_request trigger.  The action mitigates the risk by:
+#   - Never executing code from the PR (the migration script is embedded
+#     in this workflow file on the base branch, not taken from the PR).
+#   - Gating migration steps on github.actor == 'dependabot[bot]'.
+#   - Running checkout with persist-credentials: false and isolating
+#     push credentials from the migration script environment.
+# For more details read:
+# https://securitylab.github.com/research/github-actions-preventing-pwn-requests/
+
+name: Black Migration
+
+on:
+  merge_group:  # To allow using this as a required check for merging
+  pull_request_target:
+    types: [opened, synchronize, reopened, labeled, unlabeled]
+
+permissions:
+  # Commit reformatted files back to the PR branch.
+  contents: write
+  # Create and normalize migration state labels.
+  issues: write
+  # Read/update pull request metadata and comments.
+  pull-requests: write
+
+jobs:
+  black-migration:
+    name: Migrate Black
+    # Skip if it was triggered by the merge queue. We only need the workflow to
+    # be executed to meet the "Required check" condition for merging, but we
+    # don't need to actually run the job, having the job present as Skipped is
+    # enough.
+    if: |
+      github.event_name == 'pull_request_target' &&
+      github.actor == 'dependabot[bot]' &&
+      contains(github.event.pull_request.title, 'Bump black from ')
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Generate token
+        id: create-app-token
+        uses: actions/create-github-app-token@f8d387b68d61c58ab83c6c016672934102569859 # v3.0.0
+        with:
+          app-id: ${{ secrets.FREQUENZ_AUTO_DEPENDABOT_APP_ID }}
+          private-key: ${{ secrets.FREQUENZ_AUTO_DEPENDABOT_APP_PRIVATE_KEY }}
+          # Push reformatted files to the PR branch.
+          permission-contents: write
+          # Create and normalize migration state labels.
+          permission-issues: write
+          # Read/update pull request metadata and labels.
+          permission-pull-requests: write
+      - name: Migrate
+        uses: frequenz-floss/gh-action-dependabot-migrate@27763fb5eb56476d91abe00132e8a0614171f92f # v1.2.0
+        with:
+          migration-script: |
+            import os
+            import subprocess
+            import sys
+
+            version = os.environ["MIGRATION_VERSION"].lstrip("v")
+            subprocess.run(
+                [sys.executable, "-Im", "pip", "install", f"black=={version}"],
+                check=True,
+            )
+            subprocess.run([sys.executable, "-Im", "black", "."], check=True)
+          token: ${{ steps.create-app-token.outputs.token }}
+          auto-merge-on-changes: "false"
+          version-iteration: "false"
+          sign-commits: "true"
+          auto-merged-label: "tool:auto-merged"
+          migrated-label: "tool:black:migration:executed"
+          intervention-pending-label: "tool:black:migration:intervention-pending"
+          intervention-done-label: "tool:black:migration:intervention-done"
diff --git a/.github/workflows/ci-pr.yaml b/.github/workflows/ci-pr.yaml
index 73fc391..c98925c 100644
--- a/.github/workflows/ci-pr.yaml
+++ b/.github/workflows/ci-pr.yaml
@@ -3,6 +3,10 @@ name: Test PR
 on:
   pull_request:
 
+permissions:
+  # Read repository contents for checkout and dependency resolution only.
+  contents: read
+
 env:
   # Please make sure this version is included in the `matrix`, as the
   # `matrix` section can't use `env`, so it must be entered manually
@@ -17,10 +21,10 @@ jobs:
 
     steps:
       - name: Setup Git
-        uses: frequenz-floss/gh-action-setup-git@v1.0.0
+        uses: frequenz-floss/gh-action-setup-git@f9d86a01228ee1cadaac5224d4d7626f1eb23f90 # v1.0.0
 
       - name: Fetch sources
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           submodules: true
 
@@ -43,7 +47,7 @@ jobs:
 
     steps:
       - name: Run nox
-        uses: frequenz-floss/gh-action-nox@v1.1.1
+        uses: frequenz-floss/gh-action-nox@e1351cf45e05e85afc1c79ab883e06322892d34c # v1.1.0
         with:
           python-version: "3.11"
           nox-session: ci_checks_max
@@ -53,15 +57,15 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Setup Git
-        uses: frequenz-floss/gh-action-setup-git@v1.0.0
+        uses: frequenz-floss/gh-action-setup-git@f9d86a01228ee1cadaac5224d4d7626f1eb23f90 # v1.0.0
 
       - name: Fetch sources
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           submodules: true
 
       - name: Setup Python
-        uses: frequenz-floss/gh-action-setup-python-with-deps@v1.0.4
+        uses: frequenz-floss/gh-action-setup-python-with-deps@e4d0b2ef8f5a1612d7827f3abaef17c931d2b946 # v1.0.2
         with:
           python-version: ${{ env.DEFAULT_PYTHON_VERSION }}
           dependencies: .[dev-mkdocs]
@@ -70,11 +74,14 @@ jobs:
         env:
           MIKE_VERSION: gh-${{ github.job }}
         run: |
-          mike deploy $MIKE_VERSION
-          mike set-default $MIKE_VERSION
+          # mike is installed as a console script, not a runnable module.
+          # Run the installed script under isolated mode to avoid importing from
+          # the workspace when building docs from checked-out code.
+          python -I "$(command -v mike)" deploy "$MIKE_VERSION"
+          python -I "$(command -v mike)" set-default "$MIKE_VERSION"
 
       - name: Upload site
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
         with:
           name: docs-site
           path: site/
diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 185c768..71f9191 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -15,6 +15,10 @@ on:
       - 'dependabot/**'
   workflow_dispatch:
 
+permissions:
+  # Read repository contents for checkout and dependency resolution only.
+  contents: read
+
 env:
   # Please make sure this version is included in the `matrix`, as the
   # `matrix` section can't use `env`, so it must be entered manually
@@ -29,10 +33,10 @@ jobs:
 
     steps:
       - name: Setup Git
-        uses: frequenz-floss/gh-action-setup-git@v1.0.0
+        uses: frequenz-floss/gh-action-setup-git@f9d86a01228ee1cadaac5224d4d7626f1eb23f90 # v1.0.0
 
       - name: Fetch sources
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           submodules: true
 
@@ -69,7 +73,7 @@ jobs:
 
     steps:
       - name: Run nox
-        uses: frequenz-floss/gh-action-nox@v1.1.1
+        uses: frequenz-floss/gh-action-nox@e1351cf45e05e85afc1c79ab883e06322892d34c # v1.1.0
         with:
           python-version: ${{ matrix.python }}
           nox-session: ${{ matrix.nox-session }}
@@ -85,6 +89,8 @@ jobs:
     # We skip this job only if nox was also skipped
     if: always() && needs.nox.result != 'skipped'
     runs-on: ubuntu-slim
+    # Drop token permissions: this job only checks matrix status from `needs`.
+    permissions: {}
     env:
       DEPS_RESULT: ${{ needs.nox.result }}
     steps:
@@ -100,24 +106,24 @@ jobs:
 
     steps:
       - name: Setup Git
-        uses: frequenz-floss/gh-action-setup-git@v1.0.0
+        uses: frequenz-floss/gh-action-setup-git@f9d86a01228ee1cadaac5224d4d7626f1eb23f90 # v1.0.0
 
       - name: Fetch sources
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           submodules: true
 
       - name: Setup Python
-        uses: frequenz-floss/gh-action-setup-python-with-deps@v1.0.4
+        uses: frequenz-floss/gh-action-setup-python-with-deps@e4d0b2ef8f5a1612d7827f3abaef17c931d2b946 # v1.0.2
         with:
           python-version: ${{ env.DEFAULT_PYTHON_VERSION }}
           dependencies: build
 
       - name: Build the source and binary distribution
-        run: python -m build
+        run: python -Im build
 
       - name: Upload distribution files
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
         with:
           name: dist-packages
           path: dist/
@@ -139,13 +145,13 @@ jobs:
 
     steps:
       - name: Setup Git
-        uses: frequenz-floss/gh-action-setup-git@v1.0.0
+        uses: frequenz-floss/gh-action-setup-git@f9d86a01228ee1cadaac5224d4d7626f1eb23f90 # v1.0.0
 
       - name: Print environment (debug)
         run: env
 
       - name: Download package
-        uses: actions/download-artifact@v8
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with:
           name: dist-packages
           path: dist
@@ -165,13 +171,13 @@ jobs:
             > pyproject.toml
 
       - name: Setup Python
-        uses: frequenz-floss/gh-action-setup-python-with-deps@v1.0.4
+        uses: frequenz-floss/gh-action-setup-python-with-deps@e4d0b2ef8f5a1612d7827f3abaef17c931d2b946 # v1.0.2
         with:
           python-version: ${{ matrix.python }}
           dependencies: dist/*.whl
 
       - name: Print installed packages (debug)
-        run: python -m pip freeze
+        run: python -Im pip freeze
 
   # This job runs if all the `test-installation` matrix jobs ran and succeeded.
   # It is only used to have a single job that we can require in branch
@@ -184,6 +190,8 @@ jobs:
     # We skip this job only if test-installation was also skipped
     if: always() && needs.test-installation.result != 'skipped'
     runs-on: ubuntu-slim
+    # Drop token permissions: this job only checks matrix status from `needs`.
+    permissions: {}
     env:
       DEPS_RESULT: ${{ needs.test-installation.result }}
     steps:
@@ -196,15 +204,15 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Setup Git
-        uses: frequenz-floss/gh-action-setup-git@v1.0.0
+        uses: frequenz-floss/gh-action-setup-git@f9d86a01228ee1cadaac5224d4d7626f1eb23f90 # v1.0.0
 
       - name: Fetch sources
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           submodules: true
 
       - name: Setup Python
-        uses: frequenz-floss/gh-action-setup-python-with-deps@v1.0.4
+        uses: frequenz-floss/gh-action-setup-python-with-deps@e4d0b2ef8f5a1612d7827f3abaef17c931d2b946 # v1.0.2
         with:
           python-version: ${{ env.DEFAULT_PYTHON_VERSION }}
           dependencies: .[dev-mkdocs]
@@ -213,11 +221,14 @@ jobs:
         env:
           MIKE_VERSION: gh-${{ github.job }}
         run: |
-          mike deploy $MIKE_VERSION
-          mike set-default $MIKE_VERSION
+          # mike is installed as a console script, not a runnable module.
+          # Run the installed script under isolated mode to avoid importing from
+          # the workspace when building docs from checked-out code.
+          python -I "$(command -v mike)" deploy "$MIKE_VERSION"
+          python -I "$(command -v mike)" set-default "$MIKE_VERSION"
 
       - name: Upload site
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
         with:
           name: docs-site
           path: site/
@@ -229,18 +240,19 @@ jobs:
     if: github.event_name == 'push'
     runs-on: ubuntu-24.04
     permissions:
+      # Push generated documentation updates to the `gh-pages` branch.
       contents: write
     steps:
       - name: Setup Git
-        uses: frequenz-floss/gh-action-setup-git@v1.0.0
+        uses: frequenz-floss/gh-action-setup-git@f9d86a01228ee1cadaac5224d4d7626f1eb23f90 # v1.0.0
 
       - name: Fetch sources
-        uses: actions/checkout@v6
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           submodules: true
 
       - name: Setup Python
-        uses: frequenz-floss/gh-action-setup-python-with-deps@v1.0.4
+        uses: frequenz-floss/gh-action-setup-python-with-deps@e4d0b2ef8f5a1612d7827f3abaef17c931d2b946 # v1.0.2
         with:
           python-version: ${{ env.DEFAULT_PYTHON_VERSION }}
           dependencies: .[dev-mkdocs]
@@ -253,7 +265,7 @@ jobs:
           GIT_REF: ${{ github.ref }}
           GIT_SHA: ${{ github.sha }}
         run: |
-          python -m frequenz.repo.config.cli.version.mike.info
+          python -Im frequenz.repo.config.cli.version.mike.info
 
       - name: Fetch the gh-pages branch
         if: steps.mike-version.outputs.version
@@ -274,13 +286,23 @@ jobs:
           GIT_REF: ${{ github.ref }}
           GIT_SHA: ${{ github.sha }}
         run: |
-          mike deploy --update-aliases --title "$TITLE" "$VERSION" $ALIASES
+          # Collect aliases into an array to avoid accidental (or malicious)
+          # shell injection when passing them to mike.
+          aliases=()
+          if test -n "$ALIASES"; then
+            read -r -a aliases <<<"$ALIASES"
+          fi
+          # mike is installed as a console script, not a runnable module.
+          # Run the installed script under isolated mode to avoid importing from
+          # the workspace when building docs from checked-out code.
+          python -I "$(command -v mike)" \
+            deploy --update-aliases --title "$TITLE" "$VERSION" "${aliases[@]}"
 
       - name: Sort site versions
         if: steps.mike-version.outputs.version
         run: |
           git checkout gh-pages
-          python -m frequenz.repo.config.cli.version.mike.sort versions.json
+          python -Im frequenz.repo.config.cli.version.mike.sort versions.json
           git commit -a -m "Sort versions.json"
 
       - name: Publish site
@@ -294,14 +316,12 @@ jobs:
     # Create a release only on tags creation
     if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/v')
     permissions:
-      # We need write permissions on contents to create GitHub releases and on
-      # discussions to create the release announcement in the discussion forums
+      # Create GitHub releases and upload distribution artifacts.
       contents: write
-      discussions: write
     runs-on: ubuntu-slim
     steps:
       - name: Download distribution files
-        uses: actions/download-artifact@v8
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with:
           name: dist-packages
           path: dist
@@ -323,14 +343,14 @@ jobs:
       - name: Create GitHub release
         run: |
           set -ux
-          extra_opts=
-          if echo "$REF_NAME" | grep -- -; then extra_opts=" --prerelease"; fi
+          extra_opts=()
+          if echo "$REF_NAME" | grep -- -; then extra_opts+=(--prerelease); fi
           gh release create \
             -R "$REPOSITORY" \
             --notes-file RELEASE_NOTES.md \
             --generate-notes \
-            $extra_opts \
-            $REF_NAME \
+            "${extra_opts[@]}" \
+            "$REF_NAME" \
             dist/*
         env:
           REF_NAME: ${{ github.ref_name }}
@@ -347,10 +367,10 @@ jobs:
       id-token: write
     steps:
       - name: Download distribution files
-        uses: actions/download-artifact@v8
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with:
           name: dist-packages
           path: dist
 
       - name: Publish the Python distribution to PyPI
-        uses: pypa/gh-action-pypi-publish@release/v1
+        uses: pypa/gh-action-pypi-publish@ed0c53931b1dc9bd32cbe73a98c7f6766f8a527e # v1.13.0
diff --git a/.github/workflows/dco-merge-queue.yml b/.github/workflows/dco-merge-queue.yml
index d9597ad..7a4260d 100644
--- a/.github/workflows/dco-merge-queue.yml
+++ b/.github/workflows/dco-merge-queue.yml
@@ -3,6 +3,9 @@ name: DCO
 on:
   merge_group:
 
+# Drop all token permissions: this workflow only runs a local echo command.
+permissions: {}
+
 jobs:
   DCO:
     runs-on: ubuntu-slim
diff --git a/.github/workflows/grpc-migration.yaml b/.github/workflows/grpc-migration.yaml
new file mode 100644
index 0000000..555bd24
--- /dev/null
+++ b/.github/workflows/grpc-migration.yaml
@@ -0,0 +1,87 @@
+# Automatic grpc/protobuf build/runtime sync for Dependabot PRs
+#
+# The template's `pyproject.toml` pins `protobuf`, `grpcio` and `grpcio-tools`
+# in `[build-system].requires` as *exact* versions, and also declares
+# `protobuf` and `grpcio` in `[project].dependencies` with a `>= <build-pin>`
+# lower bound.  The lower bound must always match the exact pin, because the
+# protobuf cross-version runtime guarantee requires the runtime to be at
+# least the version used at generation time:
+#   https://protobuf.dev/support/cross-version-runtime-guarantee/
+#
+# Dependabot correctly bumps `[build-system].requires`, but it does not bump
+# the matching `>=` floor in `[project].dependencies`.  This workflow runs
+# after a Dependabot grpc/protobuf group PR, rewrites the `>=` floor to match
+# the new build pins, and pushes the fix-up commit back onto the PR branch.
+#
+# The companion auto-dependabot workflow skips the `grpc-compatible`,
+# `grpcio-major` and `protobuf-major` groups so those PRs are handled
+# exclusively by this migration workflow.
+#
+# XXX: !!! SECURITY WARNING !!!
+# pull_request_target has write access to the repo, and can read secrets.
+# This is required because Dependabot PRs are treated as fork PRs: the
+# GITHUB_TOKEN is read-only and secrets are unavailable with a plain
+# pull_request trigger.  The action mitigates the risk by:
+#   - Never executing code from the PR (the migration script is fetched
+#     from the repo-config branch configured below, not taken from the PR).
+#   - Gating migration steps on github.actor == 'dependabot[bot]' AND the
+#     PR title.
+#   - Running checkout with persist-credentials: false and isolating
+#     push credentials from the migration script environment.
+# For more details read:
+# https://securitylab.github.com/research/github-actions-preventing-pwn-requests/
+
+name: gRPC Migration
+
+on:
+  merge_group:  # To allow using this as a required check for merging
+  pull_request_target:
+    types: [opened, synchronize, reopened, labeled, unlabeled]
+
+permissions:
+  # Commit the sync-up to the PR branch.
+  contents: write
+  # Create and normalize migration state labels.
+  issues: write
+  # Read/update pull request metadata and comments.
+  pull-requests: write
+
+jobs:
+  grpc-migration:
+    name: Fix gRPC/protobuf runtime floors
+    # Skip if it was triggered by the merge queue. We only need the workflow to
+    # be executed to meet the "Required check" condition for merging, but we
+    # don't need to actually run the job, having the job present as Skipped is
+    # enough.
+    if: |
+      github.event_name == 'pull_request_target' &&
+      github.actor == 'dependabot[bot]' &&
+      (contains(github.event.pull_request.title, 'the grpc-compatible group') ||
+       contains(github.event.pull_request.title, 'the grpcio-major group') ||
+       contains(github.event.pull_request.title, 'the protobuf-major group'))
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Generate token
+        id: create-app-token
+        uses: actions/create-github-app-token@1b10c78c7865c340bc4f6099eb2f838309f1e8c3 # v3.1.1
+        with:
+          app-id: ${{ secrets.FREQUENZ_AUTO_DEPENDABOT_APP_ID }}
+          private-key: ${{ secrets.FREQUENZ_AUTO_DEPENDABOT_APP_PRIVATE_KEY }}
+          # Push the sync-up commit to the PR branch.
+          permission-contents: write
+          # Create and normalize migration state labels.
+          permission-issues: write
+          # Read/update pull request metadata and labels.
+          permission-pull-requests: write
+      - name: Migrate
+        uses: frequenz-floss/gh-action-dependabot-migrate@27763fb5eb56476d91abe00132e8a0614171f92f # v1.2.0
+        with:
+          script-url-template: >- # v0.18.0
+            https://raw.githubusercontent.com/frequenz-floss/frequenz-repo-config-python/529d30b554392e6d8b66e84e92c04ac9cd170da7/cookiecutter/scripts/dependabot-grpc-fixer.py
+          token: ${{ steps.create-app-token.outputs.token }}
+          version-iteration: "false"
+          sign-commits: "true"
+          auto-merged-label: "tool:auto-merged"
+          migrated-label: "tool:grpc:migration:executed"
+          intervention-pending-label: "tool:grpc:migration:intervention-pending"
+          intervention-done-label: "tool:grpc:migration:intervention-done"
diff --git a/.github/workflows/isort-migration.yaml b/.github/workflows/isort-migration.yaml
new file mode 100644
index 0000000..fde6c0c
--- /dev/null
+++ b/.github/workflows/isort-migration.yaml
@@ -0,0 +1,92 @@
+# Automatic isort migration for Dependabot PRs
+#
+# When Dependabot upgrades isort, this workflow installs the new version and
+# runs `isort .` so the PR already contains any import-ordering changes
+# introduced by the upgrade, while leaving the PR open for review.
+#
+# isort follows SemVer but its release policy
+# (https://github.com/PyCQA/isort/blob/main/docs/major_releases/release_policy.md)
+# explicitly allows intentional formatting changes in minor releases, and
+# patch releases may also adjust output in smaller bug-fix ways.  Because of
+# that, isort is excluded from the regular `patch` and `minor` Dependabot
+# groups: every isort bump produces an individual `Bump isort from …` PR and
+# is routed through this migration workflow.
+#
+# The companion auto-dependabot workflow skips those PRs so they're handled
+# exclusively by this migration workflow.
+#
+# XXX: !!! SECURITY WARNING !!!
+# pull_request_target has write access to the repo, and can read secrets.
+# This is required because Dependabot PRs are treated as fork PRs: the
+# GITHUB_TOKEN is read-only and secrets are unavailable with a plain
+# pull_request trigger.  The action mitigates the risk by:
+#   - Never executing code from the PR (the migration script is embedded
+#     in this workflow file on the base branch, not taken from the PR).
+#   - Gating migration steps on github.actor == 'dependabot[bot]'.
+#   - Running checkout with persist-credentials: false and isolating
+#     push credentials from the migration script environment.
+# For more details read:
+# https://securitylab.github.com/research/github-actions-preventing-pwn-requests/
+
+name: isort Migration
+
+on:
+  merge_group:  # To allow using this as a required check for merging
+  pull_request_target:
+    types: [opened, synchronize, reopened, labeled, unlabeled]
+
+permissions:
+  # Commit reformatted files back to the PR branch.
+  contents: write
+  # Create and normalize migration state labels.
+  issues: write
+  # Read/update pull request metadata and comments.
+  pull-requests: write
+
+jobs:
+  isort-migration:
+    name: Migrate isort
+    # Skip if it was triggered by the merge queue. We only need the workflow to
+    # be executed to meet the "Required check" condition for merging, but we
+    # don't need to actually run the job, having the job present as Skipped is
+    # enough.
+    if: |
+      github.event_name == 'pull_request_target' &&
+      github.actor == 'dependabot[bot]' &&
+      contains(github.event.pull_request.title, 'Bump isort from ')
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Generate token
+        id: create-app-token
+        uses: actions/create-github-app-token@1b10c78c7865c340bc4f6099eb2f838309f1e8c3 # v3.1.1
+        with:
+          app-id: ${{ secrets.FREQUENZ_AUTO_DEPENDABOT_APP_ID }}
+          private-key: ${{ secrets.FREQUENZ_AUTO_DEPENDABOT_APP_PRIVATE_KEY }}
+          # Push reformatted files to the PR branch.
+          permission-contents: write
+          # Create and normalize migration state labels.
+          permission-issues: write
+          # Read/update pull request metadata and labels.
+          permission-pull-requests: write
+      - name: Migrate
+        uses: frequenz-floss/gh-action-dependabot-migrate@27763fb5eb56476d91abe00132e8a0614171f92f # v1.2.0
+        with:
+          migration-script: |
+            import os
+            import subprocess
+            import sys
+
+            version = os.environ["MIGRATION_VERSION"].lstrip("v")
+            subprocess.run(
+                [sys.executable, "-Im", "pip", "install", f"isort=={version}"],
+                check=True,
+            )
+            subprocess.run([sys.executable, "-Im", "isort", "."], check=True)
+          token: ${{ steps.create-app-token.outputs.token }}
+          auto-merge-on-changes: "false"
+          version-iteration: "false"
+          sign-commits: "true"
+          auto-merged-label: "tool:auto-merged"
+          migrated-label: "tool:isort:migration:executed"
+          intervention-pending-label: "tool:isort:migration:intervention-pending"
+          intervention-done-label: "tool:isort:migration:intervention-done"
diff --git a/.github/workflows/labeler.yml b/.github/workflows/labeler.yml
index c327e7f..393ddfc 100644
--- a/.github/workflows/labeler.yml
+++ b/.github/workflows/labeler.yml
@@ -5,7 +5,9 @@ on: [pull_request_target]
 jobs:
   Label:
     permissions:
+      # Read the labeler configuration from the repository.
       contents: read
+      # Add labels to pull requests.
       pull-requests: write
     runs-on: ubuntu-slim
     steps:
diff --git a/.github/workflows/release-notes-check.yml b/.github/workflows/release-notes-check.yml
index ef59bef..f606c53 100644
--- a/.github/workflows/release-notes-check.yml
+++ b/.github/workflows/release-notes-check.yml
@@ -18,6 +18,7 @@ jobs:
     name: Check release notes are updated
     runs-on: ubuntu-slim
     permissions:
+      # Read pull request metadata to evaluate labels and changed files.
       pull-requests: read
     steps:
       - name: Check for a release notes update
diff --git a/.github/workflows/repo-config-migration.yaml b/.github/workflows/repo-config-migration.yaml
index 6ffaf60..eb1d9c1 100644
--- a/.github/workflows/repo-config-migration.yaml
+++ b/.github/workflows/repo-config-migration.yaml
@@ -24,8 +24,11 @@ on:
     types: [opened, synchronize, reopened, labeled, unlabeled]
 
 permissions:
+  # Commit migration changes back to the PR branch.
   contents: write
+  # Create and normalize migration state labels.
   issues: write
+  # Read/update pull request metadata and comments.
   pull-requests: write
 
 jobs:
@@ -46,13 +49,23 @@ jobs:
         with:
           app-id: ${{ secrets.FREQUENZ_AUTO_DEPENDABOT_APP_ID }}
           private-key: ${{ secrets.FREQUENZ_AUTO_DEPENDABOT_APP_PRIVATE_KEY }}
+          # Push migration commits to the PR branch.
+          permission-contents: write
+          # Manage labels when auto-merging patch-only updates.
+          permission-issues: write
+          # Approve pull requests and enable auto-merge.
+          permission-pull-requests: write
+          # Allow pushes when migration changes workflow files.
+          permission-workflows: write
       - name: Migrate
-        uses: frequenz-floss/gh-action-dependabot-migrate@45994e185a9040449304a470e8f02d0e197873b4 # v1.1.1
+        uses: frequenz-floss/gh-action-dependabot-migrate@27763fb5eb56476d91abe00132e8a0614171f92f # v1.2.0
         with:
           script-url-template: >-
             https://raw.githubusercontent.com/frequenz-floss/frequenz-repo-config-python/{version}/cookiecutter/migrate.py
           token: ${{ steps.create-app-token.outputs.token }}
           migration-token: ${{ secrets.REPO_CONFIG_MIGRATION_TOKEN }}
+          version-iteration: "minor"
+          if-no-iterations: "pass"
           sign-commits: "true"
           auto-merged-label: "tool:auto-merged"
           migrated-label: "tool:repo-config:migration:executed"
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index ed8a1b2..9cbd589 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -96,14 +96,14 @@ pytest tests/test_*.py
 Or you can use `nox`:
 
 ```sh
-nox -R -s pytest -- test/test_*.py
+nox -R -s pytest -- tests/test_*.py
 ```
 
 The same appliest to `pylint` or `mypy` for example:
 
 ```sh
-nox -R -s pylint -- test/test_*.py
-nox -R -s mypy -- test/test_*.py
+nox -R -s pylint -- tests/test_*.py
+nox -R -s mypy -- tests/test_*.py
 ```
 
 ### Building the documentation
@@ -200,30 +200,3 @@ These are the steps to create a new release:
    eventually too).
 
 7. Celebrate!
-
-##  Cross-Arch Testing
-
-This project has built-in support for testing across multiple architectures.
-Currently, our CI conducts tests on `arm64` machines using QEMU emulation. We
-also have the flexibility to expand this support to include additional
-architectures in the future.
-
-This project contains Dockerfiles that can be used in the CI to test the
-python package in non-native machine architectures, e.g., `arm64`. The
-Dockerfiles exist in the directory `.github/containers/nox-cross-arch`, and
-follow a naming scheme so that they can be easily used in build matrices in the
-CI, in `nox-cross-arch` job. The naming scheme is:
-
-```
-<arch>-<os>-python-<python-version>.Dockerfile
-```
-
-E.g.,
-
-```
-arm64-ubuntu-20.04-python-3.11.Dockerfile
-```
-
-If a Dockerfile for your desired target architecture, OS, and python version
-does not exist here, please add one before proceeding to add your options to
-the test matrix.
diff --git a/pyproject.toml b/pyproject.toml
index 5d6461a..20617ad 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@
 requires = [
   "setuptools == 82.0.1",
   "setuptools_scm[toml] == 10.0.5",
-  "frequenz-repo-config[api] == 0.17.0",
+  "frequenz-repo-config[api] == 0.18.0",
   # We need to pin the protobuf, grpcio and  grpcio-tools dependencies to make
   # sure the code is generated using the minimum supported versions, as older
   # versions can't work with code that was generated with newer versions.
@@ -80,7 +80,7 @@ dev-mkdocs = [
   "mkdocs-material == 9.7.6",
   "mkdocstrings[python] == 0.30.1",
   "mkdocstrings-python == 1.18.2",
-  "frequenz-repo-config[api] == 0.17.0",
+  "frequenz-repo-config[api] == 0.18.0",
 ]
 dev-mypy = [
   "mypy == 2.0.0",
@@ -89,7 +89,7 @@ dev-mypy = [
   # For checking the noxfile, docs/ script, and tests
   "frequenz-api-reporting[dev-mkdocs,dev-noxfile,dev-pytest]",
 ]
-dev-noxfile = ["nox == 2026.4.10", "frequenz-repo-config[api] == 0.17.0"]
+dev-noxfile = ["nox == 2026.4.10", "frequenz-repo-config[api] == 0.18.0"]
 dev-pylint = [
   # dev-pytest already defines a dependency to pylint because of the examples
   # For checking the noxfile, docs/ script, and tests
@@ -98,7 +98,7 @@ dev-pylint = [
 dev-pytest = [
   "pytest == 9.0.3",
   "pylint == 4.0.5", # We need this to check for the examples
-  "frequenz-repo-config[extra-lint-examples] == 0.17.0",
+  "frequenz-repo-config[extra-lint-examples] == 0.18.0",
 ]
 dev = [
   "frequenz-api-reporting[dev-mkdocs,dev-flake8,dev-formatting,dev-mkdocs,dev-mypy,dev-noxfile,dev-pylint,dev-pytest]",
@@ -114,11 +114,15 @@ Support = "https://github.com/frequenz-floss/frequenz-api-reporting/discussions/
 [tool.black]
 line-length = 88
 target-version = ['py311']
+# Submodules may contain external code that doesn't follow our formatting rules.
+extend-exclude = '^/submodules/'
 
 [tool.isort]
 profile = "black"
 line_length = 88
 src_paths = ["benchmarks", "examples", "src", "tests"]
+# Submodules may contain external code that doesn't follow our import sorting rules.
+skip_glob = ["submodules/*"]
 
 [tool.flake8]
 # We give some flexibility to go over 88, there are cases like long URLs or