Merge branch 'error-tracking-sort-by-frequency' into 'master'

Monitor:Health Release Post - Sort Errors

See merge request gitlab-com/www-gitlab-com!36496

data/release_posts/unreleased/error-tracking-sort-by-frequency.yml

+features:
+  secondary:
+    - name: 'Sort error list by first seen, last seen and frequency'
+      available_in: [core, starter, premium, ultimate]
+      documentation_link: 'https://docs.gitlab.com/ee/user/project/operations/error_tracking.html#error-tracking-list'
+      image_url: '/images/unreleased/error-sorting.png'
+      reporter: swaldner
+      stage: monitor
+      categories:
+        - 'Error Tracking'
+      issue_url: 'https://gitlab.com/gitlab-org/gitlab/issues/34068'
+      description: |
+        Errors are often plentiful, noisy, and challenging to dig through to find the important ones which are impacting your users. Starting in GitLab 12.6, as you view a list of Sentry errors in GitLab, you'll be able to sort those errors based on frequency and when an error was last and first seen.
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