Andy Whalen

Creates a log file for network/multisite super admin actions.
The following actions are logged for Super Admin users. WordPress action names are listed in parenthesis:
<ul>
<li>change network settings (update_site_option)</li>
<li>grant super admin privileges (granted_super_admin)</li>
<li>revoke super admin privileges (revoked_super_admin)</li>
<li>upgrade blog (wpmu_upgrade_site)</li>
<li>add blog (wpmu_new_blog)</li>
<li>set blog archived (archive_blog/unarchive_blog)</li>
<li>set blog deleted (make_delete_blog/make_undelete_blog)</li>
<li>set blog mature (mature_blog/unmature_blog)</li>
<li>set blog spam (make_spam_blog/make_ham_blog)</li>
<li>delete blog (delete_blog)</li>
<li>delete user (wpmu_delete_user)</li>
<li>delete user (deleted_user)</li>
<li>change other user’s settings (edit_user_profile_update) [NOTE: doesn’t show diff]</li>
<li>change blog setting (updated_option) [NOTE: may occasionally log annoyingly large diffs]</li>
</ul>
The following actions are logged for ANY user:
<ul>
<li>login (wp_login)</li>
<li>logout (wp_logout)</li>
<li>new user (user_register)</li>
</ul>
Some actions that change data will show what the value was before and after.
Below is an example of a log entry when the user ‘smith’ has changed the Network site name from “WP Local Network” to “WP Local Networks”:
<pre><code>[Tue, 03 Sep 2013 13:45:49 +0000] [smith:1] [update_site_option] [1] [site_name] [(WP Local Network)->(WP Local Networks)] [127.0.0.1] </code></pre>
Each line in the log file will roughly follow the below example. Individual actions may log slightly different information, but the DATETIME, USERNAME, USER_ID, ACTION, and IP_ADDRESS sections should always be populated.
<pre><code>[DATETIME] [USERNAME:USER_ID] [ACTION] [AFFECTED_OBJECT_ID] [DATA_TITLE_OR_KEY] [(VALUE_BEFORE)->(VALUE_AFTER)] [IP_ADDRESS] </code></pre>

Observer

Creates a log file for network/multisite super admin actions.

Stephanie Leary

Lets you create a content inventory right in the WordPress Edit screens, similar to the process you might use to assess your site’s content in a spreadsheet. You can mark content as redundant, outdated, trivial, or in need of a review for SEO or style. These content status labels work just like categories, so you can remove the built-in ones and add your own if you like. You can also assign a content owner (distinct from the original author) and keep internal notes. The IDs are revealed on the Edit screens so you can keep track of your content even if you change titles and permalinks. The plugin supports custom post types as well as posts, pages, and media files.
There’s an Overview report under the Dashboard menu that shows you which posts/pages/attachments/etc. need attention, sorted by user. This screen also lets you export a CSV file of the audit report.
The plugin creates three new filters on the Edit screens: author, content owner, and content status. This should make it easy to narrow your focus to just a few pages at a time.
You can display the audit details to logged-in editors on the front end if you want, either above or below the content. You can style the audit message with custom CSS.
New: you can now clear data from past audits and start over!
<h4>Translations</h4>
If you would like to send me a translation, please write to me through <a href="http://sillybean.net/about/contact/" rel="nofollow ugc">my contact page</a>. Let me know which plugin you’ve translated and how you would like to be credited. I will write you back so you can attach the files in your reply.
<h3>Notes</h3>
<h4>Filter reference</h4>
‘content_audit_notes’ filters the public display of the notes field
‘content_audit_dashboard_get_posts_args’ filters the get_posts() arguments for the Dashboard widget
‘content_audit_dashboard_output’ filters the table output of the Dashboard widget
‘content_audit_dashboard_congrats’ filters the congratulations message of the Dashboard widget
‘content_audit_csv_filename’ filters the file name of the CSV download
‘content_audit_csv_header_data’ filters the header label array in the CSV download
‘content_audit_csv_row_data’ filters the contents of each row (as an array) in the CSV download

Content Audit

This is a light-weight plugin that's very approachable.. I've found people like using it.

I could imagine more robust reporting features and other small polishes, but this plugin pretty much does exactly what it says and works great.

Great plugin I love to recommend

Lets you create a content inventory right in the WordPress Edit screens. You can mark content as redundant, outdated, trivial, or in need of a review.

Observer vs Content Audit