Add release notes for v1.7

[aleks-p]

No description provided.

[github-actions]

Hello @aleks-p!
Backport pull requests need to be either:

• Pull requests which address bugs,
• Urgent fixes which need product approval, in order to get merged,
• Docs changes.

Please, if the current pull request addresses a bug fix, label it with the type/bug label.
If it already has the product approval, please add the product-approved label. For docs changes, please add the type/docs label.
If the pull request modifies CI behaviour, please add the type/ci label.
If none of the above applies, please consider removing the backport label and target the next major/minor release.
Thanks!

[github-actions]

This PR must be merged before a backport PR will be created.

[simonswine]

LGTM

[knylander-grafana]

Minor changes for heading levels and wording. Thank you for adding the release notes!

[github-actions]

The backport to release/v1.7 failed:

Validation Failed: "Could not resolve to a node with the global id of 'T_kwDOAG3Mbc4AczmP'."

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new branch
git switch --create backport-3456-to-release/v1.7 origin/release/v1.7
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x c4ed96577d10d232331cad494898c8f9cefb23a5

When the conflicts are resolved, stage and commit the changes:

git add . && git cherry-pick --continue

If you have the GitHub CLI installed:

# Push the branch to GitHub:
git push --set-upstream origin backport-3456-to-release/v1.7
# Create the PR on GitHub
gh pr create --title '[release/v1.7] Add release notes for v1.7' --body 'Backport c4ed96577d10d232331cad494898c8f9cefb23a5 from #3456' --label 'type/docs' --label 'backport' --base release/v1.7 --milestone release/v1.7 --web

Or, if you don't have the GitHub CLI installed (we recommend you install it!):

# Push the branch to GitHub:
git push --set-upstream origin backport-3456-to-release/v1.7

# Create a pull request where the `base` branch is `release/v1.7` and the `compare`/`head` branch is `backport-3456-to-release/v1.7`.

# Remove the local backport branch
git switch main
git branch -D backport-3456-to-release/v1.7