Thanks for the PR. I wonder what the root cause is. I'll do some investigation.

As this happens on the server I can't really test locally. I don't have a similar cache present. I'll see if I can't write some stuff to the error logs.

I'm sorry for the dump but...

With the following code in /output/html/http.php

foreach ( $data['http'] as $key => $row ) {
	if ( ! isset( $row['ltime'], $row['component'] ) ){
		error_log('cache purge: ' . var_export($row,true) );
		//continue;
	}

[03-Mar-2020 19:32:23 UTC] cache purge: array ( 'url' => 'https://api.wordpress.org/plugins/info/1.1/?action=plugin_information&request%5Bslug%5D=query-monitor', 'args' => array ( 'method' => 'GET', 'timeout' => 5, 'redirection' => 5, 'httpversion' => '1.0', 'user-agent' => 'WordPress/5.3.2; https://thefragens.com', 'reject_unsafe_urls' => false, 'blocking' => true, 'headers' => array ( ), 'cookies' => array ( ), 'body' => NULL, 'compress' => false, 'decompress' => true, 'sslverify' => true, 'sslcertificates' => '/sites/thefragens.com/files/wp-includes/certificates/ca-bundle.crt', 'stream' => false, 'filename' => NULL, 'limit_response_size' => NULL, '_qm_key' => '1583263942.836https://api.wordpress.org/plugins/info/1.1/?action=plugin_information&request%5Bslug%5D=query-monitor', '_redirection' => 5, ), 'start' => 1583263942.835993, 'trace' => QM_Backtrace::__set_state(array( 'trace' => array ( 0 => array ( 'file' => '/sites/thefragens.com/files/wp-includes/class-http.php', 'line' => 622, 'function' => 'request', 'class' => 'WP_Http', 'type' => '->', ), 1 => array ( 'file' => '/sites/thefragens.com/files/wp-includes/http.php', 'line' => 164, 'function' => 'get', 'class' => 'WP_Http', 'type' => '->', ), 2 => array ( 'file' => '/sites/thefragens.com/files/wp-content/plugins/wp-debugging/vendor/afragen/wp-dependency-installer/wp-dependency-installer.php', 'line' => 253, 'function' => 'wp_remote_get', ), 3 => array ( 'file' => '/sites/thefragens.com/files/wp-content/plugins/wp-debugging/vendor/afragen/wp-dependency-installer/wp-dependency-installer.php', 'line' => 207, 'function' => 'get_dot_org_latest_download', 'class' => 'WP_Dependency_Installer', 'type' => '->', ), 4 => array ( 'file' => '/sites/thefragens.com/files/wp-content/plugins/wp-debugging/vendor/afragen/wp-dependency-installer/wp-dependency-installer.php', 'line' => 270, 'function' => 'apply_config', 'class' => 'WP_Dependency_Installer', 'type' => '->', ), 5 => array ( 'file' => '/sites/thefragens.com/files/wp-includes/class-wp-hook.php', 'line' => 288, 'function' => 'admin_init', 'class' => 'WP_Dependency_Installer', 'type' => '->', ), 6 => array ( 'file' => '/sites/thefragens.com/files/wp-includes/class-wp-hook.php', 'line' => 312, 'function' => 'apply_filters', 'class' => 'WP_Hook', 'type' => '->', 'args' => array ( 0 => NULL, ), ), 7 => array ( 'file' => '/sites/thefragens.com/files/wp-includes/plugin.php', 'line' => 478, 'function' => 'do_action', 'class' => 'WP_Hook', 'type' => '->', 'args' => array ( 0 => array ( 0 => '', ), ), ), 8 => array ( 'file' => '/sites/thefragens.com/files/wp-admin/admin.php', 'line' => 170, 'function' => 'do_action', 'args' => array ( 0 => 'admin_init', ), ), 9 => array ( 'file' => '/sites/thefragens.com/files/wp-admin/index.php', 'line' => 10, 'function' => 'require_once', ), ), 'filtered_trace' => NULL, 'calling_line' => 0, 'calling_file' => '', )), 'transport' => 'curl', 'end' => 1583263943.020595, 'response' => array ( 'headers' => Requests_Utility_CaseInsensitiveDictionary::__set_state(array( 'data' => array ( 'server' => 'nginx', 'date' => 'Tue, 03 Mar 2020 19:32:22 GMT', 'content-type' => 'application/json', 'vary' => 'Accept-Encoding', 'access-control-allow-origin' => '*', 'x-frame-options' => 'SAMEORIGIN', 'content-encoding' => 'gzip', ), )), 'body' => '{"name":"Query Monitor","slug":"query-monitor","version":"3.5.2","author":"John Blackbourn<\/a>","author_profile":"https:\/\/profiles.wordpress.org\/johnbillion","requires":"3.7","tested":"5.3.2","requires_php":"5.3.6","compatibility":[],"rating":98,"ratings":{"5":319,"4":2,"3":1,"2":0,"1":5},"num_ratings":327,"support_threads":16,"support_threads_resolved":11,"downloaded":2056832,"last_updated":"2019-12-02 10:52pm GMT","added":"2013-11-19","homepage":"https:\/\/querymonitor.com\/","sections":{"description":"
Query Monitor is the developer tools panel for WordPress. It enables debugging of database queries, PHP errors, hooks and actions, block editor blocks, enqueued scripts and stylesheets, HTTP API calls, and more.<\/p>\n
It includes some advanced features such as debugging of Ajax calls, REST API calls, and user capability checks. It includes the ability to narrow down much of its output by plugin or theme, allowing you to quickly determine poorly performing plugins, themes, or functions.<\/p>\n
Query Monitor focuses heavily on presenting its information in a useful manner, for example by showing aggregate database queries grouped by the plugins, themes, or functions that are responsible for them. It adds an admin toolbar menu showing an overview of the current page, with complete debugging information shown in panels once you select a menu item.<\/p>\n
For complete information, please see the Query Monitor website<\/a>.<\/p>\n
Here’s an overview of what’s shown for each page load:<\/p>\n
\n
Database queries, including notifications for slow, duplicate, or erroneous queries. Allows filtering by query type (SELECT<\/code>, UPDATE<\/code>, DELETE<\/code>, etc), responsible component (plugin, theme, WordPress core), and calling function, and provides separate aggregate views for each.<\/li>\n
The template filename, the complete template hierarchy, and names of all template parts that were loaded or not loaded.<\/li>\n
PHP errors presented nicely along with their responsible component and call stack, and a visible warning in the admin toolbar.<\/li>\n
Blocks and associated properties in post content when using WordPress 5.0+ or the Gutenberg plugin.<\/li>\n
Matched rewrite rules, associated query strings, and query vars.<\/li>\n
Enqueued scripts and stylesheets, along with their dependencies, dependents, and alerts for broken dependencies.<\/li>\n
Language settings and loaded translation files (MO files) for each text domain.<\/li>\n
HTTP API requests, with response code, responsible component, and time taken, with alerts for failed or erroneous requests.<\/li>\n
User capability checks, along with the result and any parameters passed to the capability check.<\/li>\n
Environment information, including detailed information about PHP, the database, WordPress, and the web server.<\/li>\n
The values of all WordPress conditional functions such as is_single()<\/code>, is_home()<\/code>, etc.<\/li>\n
Transients that were updated.<\/li>\n<\/ul>\n
In addition:<\/p>\n
\n
Whenever a redirect occurs, Query Monitor adds an HTTP header containing the call stack, so you can use your favourite HTTP inspector or browser developer tools to trace what triggered the redirect.<\/li>\n
The response from any jQuery-initiated Ajax request on the page will contain various debugging information in its headers. PHP errors also get output to the browser’s developer console.<\/li>\n
The response from an authenticated WordPress REST API request will contain various debugging information in its headers, as long as the authenticated user has permission to view Query Monitor’s output.<\/li>\n<\/ul>\n
By default, Query Monitor’s output is only shown to Administrators on single-site installations, and Super Admins on Multisite installations.<\/p>\n
In addition to this, you can set an authentication cookie which allows you to view Query Monitor output when you’re not logged in (or if you’re logged in as a non-Administrator). See the Settings panel for details.<\/p>\n
Privacy Statement<\/h4>\n
Query Monitor is private by default and always will be. It does not persistently store any of the data that it collects. It does not send data to any third party, nor does it include any third party resources.<\/p>\n
Query Monitor’s full privacy statement can be found here<\/a>.<\/p>\n","faq":"\n
Who can see Query Monitor’s output?<\/h4>\n
\n
By default, Query Monitor’s output is only shown to Administrators on single-site installations, and Super Admins on Multisite installations.<\/p>\n
In addition to this, you can set an authentication cookie which allows you to view Query Monitor output when you’re not logged in (or if you’re logged in as a non-Administrator). See the Settings panel for details.<\/p>\n<\/p>\n
Does Query Monitor itself impact the page generation time or memory usage?<\/h4>\n
\n
Short answer: Yes, but only a little.<\/p>\n
Long answer: Query Monitor has a small impact on page generation time because it hooks into WordPress in the same way that other plugins do. The impact is low; typically between 10ms and 100ms depending on the complexity of your site.<\/p>\n
Query Monitor’s memory usage typically accounts for around 10% of the total memory used to generate the page.<\/p>\n<\/p>\n
Are there any add-on plugins for Query Monitor?<\/h4>\n
\n
A list of add-on plugins for Query Monitor can be found here.<\/a><\/p>\n
In addition, Query Monitor transparently supports add-ons for the Debug Bar plugin. If you have any Debug Bar add-ons installed, just deactivate Debug Bar and the add-ons will show up in Query Monitor’s menu.<\/p>\n<\/p>\n
Where can I suggest a new feature or report a bug?<\/h4>\n
\n
Please use the issue tracker on Query Monitor’s GitHub repo<\/a> as it’s easier to keep track of issues there, rather than on the wordpress.org support forums.<\/p>\n<\/p>\n
Is Query Monitor available on WordPress.com VIP Go?<\/h4>\n
\n
Yep! However, a user needs to be granted the view_query_monitor<\/code> capability to see Query Monitor even if they’re an administrator.<\/p>\n<\/p>\n
I’m using multiple instances of wpdb. How do I get my additional instances to show up in Query Monitor?<\/h4>\n
\n
You’ll need to hook into the qm\/collect\/db_objects<\/code> filter and add an item to the array containing your wpdb<\/code> instance. For example:<\/p>\n
add_filter( 'qm\/collect\/db_objects', function( $objects ) {\n $objects['my_db'] = $GLOBALS['my_db'];\n return $objects;\n} );\n<\/code><\/pre>\n

Your wpdb<\/code> instance will then show up as a separate panel, and the query time and query count will show up separately in the admin toolbar menu. Aggregate information (queries by caller and component) will not be separated.<\/p>\n<\/p>\n

Can I click on stack traces to open the file in my editor?<\/h4>\n

\n

Yes! You can enable this on the Settings panel.<\/p>\n<\/p>\n

Do you accept donations?<\/h4>\n

\n

No, I do not accept donations. If you like the plugin, I’d love for you to leave a review<\/a>. Tell all your friends about the plugin too!<\/p>\n<\/p>\n\n","changelog":"

For Query Monitor’s changelog, please see the Releases page on GitHub<\/a>.<\/p>\n","screenshots":"

\"Admin<\/a>
Admin Toolbar Menu<\/p><\/li>

\"Aggregate<\/a>
Aggregate Database Queries by Component<\/p><\/li>

\"Capability<\/a>
Capability Checks<\/p><\/li>

\"Database<\/a>
Database Queries<\/p><\/li>

\"Hooks<\/a>
Hooks and Actions<\/p><\/li>

\"HTTP<\/a>
HTTP API Requests<\/p><\/li>

\"Aggregate<\/a>
Aggregate Database Queries by Calling Function<\/p><\/li><\/ol>"},"download_link":"https:\/\/downloads.wordpress.org\/plugin\/query-monitor.3.5.2.zip","screenshots":{"1":{"src":"https:\/\/ps.w.org\/query-monitor\/assets\/screenshot-1.png?rev=1856844","caption":"Admin Toolbar Menu"},"2":{"src":"https:\/\/ps.w.org\/query-monitor\/assets\/screenshot-2.png?rev=1856844","caption":"Aggregate Database Queries by Component"},"3":{"src":"https:\/\/ps.w.org\/query-monitor\/assets\/screenshot-3.png?rev=1856844","caption":"Capability Checks"},"4":{"src":"https:\/\/ps.w.org\/query-monitor\/assets\/screenshot-4.png?rev=1856844","caption":"Database Queries"},"5":{"src":"https:\/\/ps.w.org\/query-monitor\/assets\/screenshot-5.png?rev=1856844","caption":"Hooks and Actions"},"6":{"src":"https:\/\/ps.w.org\/query-monitor\/assets\/screenshot-6.png?rev=1856844","caption":"HTTP API Requests"},"7":{"src":"https:\/\/ps.w.org\/query-monitor\/assets\/screenshot-7.png?rev=1856844","caption":"Aggregate Database Queries by Calling Function"}},"tags":{"debug":"debug","debug-bar":"debug 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'response' =>
array (
'code' => 200,
'message' => 'OK',
),
'cookies' =>
array (
),
'filename' => NULL,
'http_response' =>
WP_HTTP_Requests_Response::__set_state(array(
'response' =>
Requests_Response::__set_state(array(
'body' => '{"name":"Query Monitor","slug":"query-monitor","version":"3.5.2","author":"John Blackbourn<\/a>","author_profile":"https:\/\/profiles.wordpress.org\/johnbillion","requires":"3.7","tested":"5.3.2","requires_php":"5.3.6","compatibility":[],"rating":98,"ratings":{"5":319,"4":2,"3":1,"2":0,"1":5},"num_ratings":327,"support_threads":16,"support_threads_resolved":11,"downloaded":2056832,"last_updated":"2019-12-02 10:52pm GMT","added":"2013-11-19","homepage":"https:\/\/querymonitor.com\/","sections":{"description":"

Query Monitor is the developer tools panel for WordPress. It enables debugging of database queries, PHP errors, hooks and actions, block editor blocks, enqueued scripts and stylesheets, HTTP API calls, and more.<\/p>\n

It includes some advanced features such as debugging of Ajax calls, REST API calls, and user capability checks. It includes the ability to narrow down much of its output by plugin or theme, allowing you to quickly determine poorly performing plugins, themes, or functions.<\/p>\n

Query Monitor focuses heavily on presenting its information in a useful manner, for example by showing aggregate database queries grouped by the plugins, themes, or functions that are responsible for them. It adds an admin toolbar menu showing an overview of the current page, with complete debugging information shown in panels once you select a menu item.<\/p>\n

For complete information, please see the Query Monitor website<\/a>.<\/p>\n

Here’s an overview of what’s shown for each page load:<\/p>\n

\n

Database queries, including notifications for slow, duplicate, or erroneous queries. Allows filtering by query type (SELECT<\/code>, UPDATE<\/code>, DELETE<\/code>, etc), responsible component (plugin, theme, WordPress core), and calling function, and provides separate aggregate views for each.<\/li>\n
The template filename, the complete template hierarchy, and names of all template parts that were loaded or not loaded.<\/li>\n
PHP errors presented nicely along with their responsible component and call stack, and a visible warning in the admin toolbar.<\/li>\n
Blocks and associated properties in post content when using WordPress 5.0+ or the Gutenberg plugin.<\/li>\n
Matched rewrite rules, associated query strings, and query vars.<\/li>\n
Enqueued scripts and stylesheets, along with their dependencies, dependents, and alerts for broken dependencies.<\/li>\n
Language settings and loaded translation files (MO files) for each text domain.<\/li>\n
HTTP API requests, with response code, responsible component, and time taken, with alerts for failed or erroneous requests.<\/li>\n
User capability checks, along with the result and any parameters passed to the capability check.<\/li>\n
Environment information, including detailed information about PHP, the database, WordPress, and the web server.<\/li>\n
The values of all WordPress conditional functions such as is_single()<\/code>, is_home()<\/code>, etc.<\/li>\n
Transients that were updated.<\/li>\n<\/ul>\n
In addition:<\/p>\n

\n

Whenever a redirect occurs, Query Monitor adds an HTTP header containing the call stack, so you can use your favourite HTTP inspector or browser developer tools to trace what triggered the redirect.<\/li>\n
The response from any jQuery-initiated Ajax request on the page will contain various debugging information in its headers. PHP errors also get output to the browser’s developer console.<\/li>\n
The response from an authenticated WordPress REST API request will contain various debugging information in its headers, as long as the authenticated user has permission to view Query Monitor’s output.<\/li>\n<\/ul>\n
By default, Query Monitor’s output is only shown to Administrators on single-site installations, and Super Admins on Multisite installations.<\/p>\n

In addition to this, you can set an authentication cookie which allows you to view Query Monitor output when you’re not logged in (or if you’re logged in as a non-Administrator). See the Settings panel for details.<\/p>\n

Privacy Statement<\/h4>\n

Query Monitor is private by default and always will be. It does not persistently store any of the data that it collects. It does not send data to any third party, nor does it include any third party resources.<\/p>\n

Query Monitor’s full privacy statement can be found here<\/a>.<\/p>\n","faq":"\n

Who can see Query Monitor’s output?<\/h4>\n

\n

By default, Query Monitor’s output is only shown to Administrators on single-site installations, and Super Admins on Multisite installations.<\/p>\n

In addition to this, you can set an authentication cookie which allows you to view Query Monitor output when you’re not logged in (or if you’re logged in as a non-Administrator). See the Settings panel for details.<\/p>\n<\/p>\n

Does Query Monitor itself impact the page generation time or memory usage?<\/h4>\n

\n

Short answer: Yes, but only a little.<\/p>\n

Long answer: Query Monitor has a small impact on page generation time because it hooks into WordPress in the same way that other plugins do. The impact is low; typically between 10ms and 100ms depending on the complexity of your site.<\/p>\n

Query Monitor’s memory usage typically accounts for around 10% of the total memory used to generate the page.<\/p>\n<\/p>\n

Are there any add-on plugins for Query Monitor?<\/h4>\n

\n

A list of add-on plugins for Query Monitor can be found here.<\/a><\/p>\n

In addition, Query Monitor transparently supports add-ons for the Debug Bar plugin. If you have any Debug Bar add-ons installed, just deactivate Debug Bar and the add-ons will show up in Query Monitor’s menu.<\/p>\n<\/p>\n

Where can I suggest a new feature or report a bug?<\/h4>\n

\n

Please use the issue tracker on Query Monitor’s GitHub repo<\/a> as it’s easier to keep track of issues there, rather than on the wordpress.org support forums.<\/p>\n<\/p>\n

Is Query Monitor available on WordPress.com VIP Go?<\/h4>\n

\n

Yep! However, a user needs to be granted the view_query_monitor<\/code> capability to see Query Monitor even if they’re an administrator.<\/p>\n<\/p>\n

I’m using multiple instances of wpdb. How do I get my additional instances to show up in Query Monitor?<\/h4>\n

\n

You’ll need to hook into the qm\/collect\/db_objects<\/code> filter and add an item to the array containing your wpdb<\/code> instance. For example:<\/p>\n

add_filter( 'qm\/collect\/db_objects', function( $objects ) {\n $objects['my_db'] = $GLOBALS['my_db'];\n return $objects;\n} );\n<\/code><\/pre>\n

Your wpdb<\/code> instance will then show up as a separate panel, and the query time and query count will show up separately in the admin toolbar menu. Aggregate information (queries by caller and component) will not be separated.<\/p>\n<\/p>\n

Can I click on stack traces to open the file in my editor?<\/h4>\n

\n

Yes! You can enable this on the Settings panel.<\/p>\n<\/p>\n

Do you accept donations?<\/h4>\n

\n

No, I do not accept donations. If you like the plugin, I’d love for you to leave a review<\/a>. Tell all your friends about the plugin too!<\/p>\n<\/p>\n\n","changelog":"

For Query Monitor’s changelog, please see the Releases page on GitHub<\/a>.<\/p>\n","screenshots":"

\"Admin<\/a>
Admin Toolbar Menu<\/p><\/li>

\"Aggregate<\/a>
Aggregate Database Queries by Component<\/p><\/li>

\"Capability<\/a>
Capability Checks<\/p><\/li>

\"Database<\/a>
Database Queries<\/p><\/li>

\"Hooks<\/a>
Hooks and Actions<\/p><\/li>

\"HTTP<\/a>
HTTP API Requests<\/p><\/li>

\"Aggregate<\/a>
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{"name":"Query Monitor","slug":"query-monitor","version":"3.5.2","author":"John Blackbourn<\/a>","author_profile":"https:\/\/profiles.wordpress.org\/johnbillion","requires":"3.7","tested":"5.3.2","requires_php":"5.3.6","compatibility":[],"rating":98,"ratings":{"5":319,"4":2,"3":1,"2":0,"1":5},"num_ratings":327,"support_threads":16,"support_threads_resolved":11,"downloaded":2056832,"last_updated":"2019-12-02 10:52pm GMT","added":"2013-11-19","homepage":"https:\/\/querymonitor.com\/","sections":{"description":"

Query Monitor is the developer tools panel for WordPress. It enables debugging of database queries, PHP errors, hooks and actions, block editor blocks, enqueued scripts and stylesheets, HTTP API calls, and more.<\/p>\n

It includes some advanced features such as debugging of Ajax calls, REST API calls, and user capability checks. It includes the ability to narrow down much of its output by plugin or theme, allowing you to quickly determine poorly performing plugins, themes, or functions.<\/p>\n

Query Monitor focuses heavily on presenting its information in a useful manner, for example by showing aggregate database queries grouped by the plugins, themes, or functions that are responsible for them. It adds an admin toolbar menu showing an overview of the current page, with complete debugging information shown in panels once you select a menu item.<\/p>\n

For complete information, please see the Query Monitor website<\/a>.<\/p>\n

Here’s an overview of what’s shown for each page load:<\/p>\n

\n

Database queries, including notifications for slow, duplicate, or erroneous queries. Allows filtering by query type (SELECT<\/code>, UPDATE<\/code>, DELETE<\/code>, etc), responsible component (plugin, theme, WordPress core), and calling function, and provides separate aggregate views for each.<\/li>\n
The template filename, the complete template hierarchy, and names of all template parts that were loaded or not loaded.<\/li>\n
PHP errors presented nicely along with their responsible component and call stack, and a visible warning in the admin toolbar.<\/li>\n
Blocks and associated properties in post content when using WordPress 5.0+ or the Gutenberg plugin.<\/li>\n
Matched rewrite rules, associated query strings, and query vars.<\/li>\n
Enqueued scripts and stylesheets, along with their dependencies, dependents, and alerts for broken dependencies.<\/li>\n
Language settings and loaded translation files (MO files) for each text domain.<\/li>\n
HTTP API requests, with response code, responsible component, and time taken, with alerts for failed or erroneous requests.<\/li>\n
User capability checks, along with the result and any parameters passed to the capability check.<\/li>\n
Environment information, including detailed information about PHP, the database, WordPress, and the web server.<\/li>\n
The values of all WordPress conditional functions such as is_single()<\/code>, is_home()<\/code>, etc.<\/li>\n
Transients that were updated.<\/li>\n<\/ul>\n
In addition:<\/p>\n

\n

Whenever a redirect occurs, Query Monitor adds an HTTP header containing the call stack, so you can use your favourite HTTP inspector or browser developer tools to trace what triggered the redirect.<\/li>\n
The response from any jQuery-initiated Ajax request on the page will contain various debugging information in its headers. PHP errors also get output to the browser’s developer console.<\/li>\n
The response from an authenticated WordPress REST API request will contain various debugging information in its headers, as long as the authenticated user has permission to view Query Monitor’s output.<\/li>\n<\/ul>\n
By default, Query Monitor’s output is only shown to Administrators on single-site installations, and Super Admins on Multisite installations.<\/p>\n

In addition to this, you can set an authentication cookie which allows you to view Query Monitor output when you’re not logged in (or if you’re logged in as a non-Administrator). See the Settings panel for details.<\/p>\n

Privacy Statement<\/h4>\n

Query Monitor is private by default and always will be. It does not persistently store any of the data that it collects. It does not send data to any third party, nor does it include any third party resources.<\/p>\n

Query Monitor’s full privacy statement can be found here<\/a>.<\/p>\n","faq":"\n

Who can see Query Monitor’s output?<\/h4>\n

\n

By default, Query Monitor’s output is only shown to Administrators on single-site installations, and Super Admins on Multisite installations.<\/p>\n

In addition to this, you can set an authentication cookie which allows you to view Query Monitor output when you’re not logged in (or if you’re logged in as a non-Administrator). See the Settings panel for details.<\/p>\n<\/p>\n

Does Query Monitor itself impact the page generation time or memory usage?<\/h4>\n

\n

Short answer: Yes, but only a little.<\/p>\n

Long answer: Query Monitor has a small impact on page generation time because it hooks into WordPress in the same way that other plugins do. The impact is low; typically between 10ms and 100ms depending on the complexity of your site.<\/p>\n

Query Monitor’s memory usage typically accounts for around 10% of the total memory used to generate the page.<\/p>\n<\/p>\n

Are there any add-on plugins for Query Monitor?<\/h4>\n

\n

A list of add-on plugins for Query Monitor can be found here.<\/a><\/p>\n

In addition, Query Monitor transparently supports add-ons for the Debug Bar plugin. If you have any Debug Bar add-ons installed, just deactivate Debug Bar and the add-ons will show up in Query Monitor’s menu.<\/p>\n<\/p>\n

Where can I suggest a new feature or report a bug?<\/h4>\n

\n

Please use the issue tracker on Query Monitor’s GitHub repo<\/a> as it’s easier to keep track of issues there, rather than on the wordpress.org support forums.<\/p>\n<\/p>\n

Is Query Monitor available on WordPress.com VIP Go?<\/h4>\n

\n

Yep! However, a user needs to be granted the view_query_monitor<\/code> capability to see Query Monitor even if they’re an administrator.<\/p>\n<\/p>\n

I’m using multiple instances of wpdb. How do I get my additional instances to show up in Query Monitor?<\/h4>\n

\n

You’ll need to hook into the qm\/collect\/db_objects<\/code> filter and add an item to the array containing your wpdb<\/code> instance. For example:<\/p>\n

add_filter( 'qm\/collect\/db_objects', function( $objects ) {\n $objects['my_db'] = $GLOBALS['my_db'];\n return $objects;\n} );\n<\/code><\/pre>\n

Your wpdb<\/code> instance will then show up as a separate panel, and the query time and query count will show up separately in the admin toolbar menu. Aggregate information (queries by caller and component) will not be separated.<\/p>\n<\/p>\n

Can I click on stack traces to open the file in my editor?<\/h4>\n

\n

Yes! You can enable this on the Settings panel.<\/p>\n<\/p>\n

Do you accept donations?<\/h4>\n

\n

No, I do not accept donations. If you like the plugin, I’d love for you to leave a review<\/a>. Tell all your friends about the plugin too!<\/p>\n<\/p>\n\n","changelog":"

For Query Monitor’s changelog, please see the Releases page on GitHub<\/a>.<\/p>\n","screenshots":"

\"Admin<\/a>
Admin Toolbar Menu<\/p><\/li>

\"Aggregate<\/a>
Aggregate Database Queries by Component<\/p><\/li>

\"Capability<\/a>
Capability Checks<\/p><\/li>

\"Database<\/a>
Database Queries<\/p><\/li>

\"Hooks<\/a>
Hooks and Actions<\/p><\/li>

\"HTTP<\/a>
HTTP API Requests<\/p><\/li>

\"Aggregate<\/a>
Aggregate Database Queries by Calling Function<\/p><\/li><\/ol>"},"download_link":"https:\/\/downloads.wordpress.org\/plugin\/query-monitor.3.5.2.zip","screenshots":{"1":{"src":"https:\/\/ps.w.org\/query-monitor\/assets\/screenshot-1.png?rev=1856844","caption":"Admin Toolbar Menu"},"2":{"src":"https:\/\/ps.w.org\/query-monitor\/assets\/screenshot-2.png?rev=1856844","caption":"Aggregate Database Queries by Component"},"3":{"src":"https:\/\/ps.w.org\/query-monitor\/assets\/screenshot-3.png?rev=1856844","caption":"Capability Checks"},"4":{"src":"https:\/\/ps.w.org\/query-monitor\/assets\/screenshot-4.png?rev=1856844","caption":"Database Queries"},"5":{"src":"https:\/\/ps.w.org\/query-monitor\/assets\/screenshot-5.png?rev=1856844","caption":"Hooks and Actions"},"6":{"src":"https:\/\/ps.w.org\/query-monitor\/assets\/screenshot-6.png?rev=1856844","caption":"HTTP API Requests"},"7":{"src":"https:\/\/ps.w.org\/query-monitor\/assets\/screenshot-7.png?rev=1856844","caption":"Aggregate Database 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[03-Mar-2020 19:32:23 UTC] PHP Notice Trying to get property 'name' of non-object in /sites/thefragens.com/files/wp-content/plugins/query-monitor/output/html/http.php on line 160
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img_src => http://s.w.org/images/browsers/safari.png?1
img_src_ssl => https://s.w.org/images/browsers/safari.png?1
current_version => 11
upgrade => false
insecure => false
mobile => false
', 'response' => array ( 'code' => 200, 'message' => 'OK', ), 'cookies' => array ( ), 'filename' => NULL, 'http_response' => WP_HTTP_Requests_Response::__set_state(array( 'response' => Requests_Response::__set_state(array( 'body' => '
name => Safari
version => 13.0.5
platform => Macintosh
update_url => https://www.apple.com/safari/
img_src => http://s.w.org/images/browsers/safari.png?1
img_src_ssl => https://s.w.org/images/browsers/safari.png?1
current_version => 11
upgrade => false
insecure => false
mobile => false
', 'raw' => 'HTTP/1.1 200 OK Server: nginx Date: Tue, 03 Mar 2020 19:32:23 GMT Content-Type: text/html; charset=utf-8 Transfer-Encoding: chunked Connection: close Vary: Accept-Encoding X-Frame-Options: SAMEORIGIN Content-Encoding: gzip
name => Safari
version => 13.0.5
platform => Macintosh
update_url => https://www.apple.com/safari/
img_src => http://s.w.org/images/browsers/safari.png?1
img_src_ssl => https://s.w.org/images/browsers/safari.png?1
current_version => 11
upgrade => false
insecure => false
mobile => false
', 'headers' => Requests_Response_Headers::__set_state(array( 'data' => array ( 'server' => array ( 0 => 'nginx', ), 'date' => array ( 0 => 'Tue, 03 Mar 2020 19:32:23 GMT', ), 'content-type' => array ( 0 => 'text/html; charset=utf-8', ), 'vary' => array ( 0 => 'Accept-Encoding', ), 'x-frame-options' => array ( 0 => 'SAMEORIGIN', ), 'content-encoding' => array ( 0 => 'gzip', ), ), )), 'status_code' => 200, 'protocol_version' => 1.1, 'success' => true, 'redirects' => 0, 'url' => 'https://api.wordpress.org/core/browse-happy/1.1/', 'history' => array ( ), 'cookies' => Requests_Cookie_Jar::__set_state(array( 'cookies' => array ( ), )), )), 'filename' => NULL, 'data' => NULL, 'headers' => NULL, 'status' => NULL, )), ), 'info' => array ( 'url' => 'https://api.wordpress.org/core/browse-happy/1.1/', 'content_type' => 'text/html; charset=utf-8', 'http_code' => 200, 'header_size' => 234, 'request_size' => 462, 'filetime' => -1, 'ssl_verify_result' => 0, 'redirect_count' => 0, 'total_time' => 0.167373, 'namelookup_time' => 3.4E-5, 'connect_time' => 0.050238, 'pretransfer_time' => 0.115476, 'size_upload' => 149.0, 'size_download' => 191.0, 'speed_download' => 1143.0, 'speed_upload' => 892.0, 'download_content_length' => -1.0, 'upload_content_length' => 149.0, 'starttransfer_time' => 0.167236, 'redirect_time' => 0.0, 'redirect_url' => '', 'primary_ip' => '198.143.164.251', 'certinfo' => array ( ), 'primary_port' => 443, 'local_ip' => '167.71.126.23', 'local_port' => 57184, 'http_version' => 2, 'protocol' => 2, 'ssl_verifyresult' => 0, 'scheme' => 'HTTPS', ), )
[03-Mar-2020 19:32:23 UTC] PHP Notice Undefined index: ltime in /sites/thefragens.com/files/wp-content/plugins/query-monitor/output/html/http.php on line 77
[03-Mar-2020 19:32:23 UTC] PHP Notice Undefined index: component in /sites/thefragens.com/files/wp-content/plugins/query-monitor/output/html/http.php on line 123
[03-Mar-2020 19:32:23 UTC] PHP Notice Trying to get property 'name' of non-object in /sites/thefragens.com/files/wp-content/plugins/query-monitor/output/html/http.php on line 160
[03-Mar-2020 19:32:23 UTC] PHP Notice Undefined index: type in /sites/thefragens.com/files/wp-content/plugins/query-monitor/output/html/http.php on line 161
[03-Mar-2020 19:32:23 UTC] PHP Notice Undefined index: ltime in /sites/thefragens.com/files/wp-content/plugins/query-monitor/output/html/http.php on line 162
[03-Mar-2020 19:32:23 UTC] PHP Notice Trying to get property 'context' of non-object in /sites/thefragens.com/files/wp-content/plugins/query-monitor/output/html/http.php on line 164
[03-Mar-2020 19:32:23 UTC] PHP Notice Trying to get property 'name' of non-object in /sites/thefragens.com/files/wp-content/plugins/query-monitor/output/html/http.php on line 296
[03-Mar-2020 19:32:23 UTC] cache purge: array ( 'url' => 'https://api.wordpress.org/core/serve-happy/1.0/?php_version=7.4.2', 'args' => array ( 'method' => 'GET', 'timeout' => 5, 'redirection' => 5, 'httpversion' => '1.0', 'user-agent' => 'WordPress/5.3.2; https://thefragens.com', 'reject_unsafe_urls' => false, 'blocking' => true, 'headers' => array ( ), 'cookies' => array ( ), 'body' => NULL, 'compress' => false, 'decompress' => true, 'sslverify' => true, 'sslcertificates' => '/sites/thefragens.com/files/wp-includes/certificates/ca-bundle.crt', 'stream' => false, 'filename' => NULL, 'limit_response_size' => NULL, '_qm_key' => '1583263943.3791https://api.wordpress.org/core/serve-happy/1.0/?php_version=7.4.2', '_redirection' => 5, ), 'start' => 1583263943.379074, 'trace' => QM_Backtrace::__set_state(array( 'trace' => array ( 0 => array ( 'file' => '/sites/thefragens.com/files/wp-includes/class-http.php', 'line' => 622, 'function' => 'request', 'class' => 'WP_Http', 'type' => '->', ), 1 => array ( 'file' => '/sites/thefragens.com/files/wp-includes/http.php', 'line' => 164, 'function' => 'get', 'class' => 'WP_Http', 'type' => '->', ), 2 => array ( 'file' => '/sites/thefragens.com/files/wp-admin/includes/misc.php', 'line' => 1405, 'function' => 'wp_remote_get', ), 3 => array ( 'file' => '/sites/thefragens.com/files/wp-admin/includes/dashboard.php', 'line' => 39, 'function' => 'wp_check_php_version', ), 4 => array ( 'file' => '/sites/thefragens.com/files/wp-admin/index.php', 'line' => 15, 'function' => 'wp_dashboard_setup', ), ), 'filtered_trace' => NULL, 'calling_line' => 0, 'calling_file' => '', )), 'transport' => 'curl', 'end' => 1583263943.552964, 'response' => array ( 'headers' => Requests_Utility_CaseInsensitiveDictionary::__set_state(array( 'data' => array ( 'server' => 'nginx', 'date' => 'Tue, 03 Mar 2020 19:32:23 GMT', 'content-type' => 'application/json; charset=utf-8', 'vary' => 'Accept-Encoding', 'x-frame-options' => 'SAMEORIGIN', 'content-encoding' => 'gzip', ), )), 'body' => '
recommended_version => 7.3
minimum_version => 5.6.20
is_supported => true
is_secure => true
is_acceptable => true
', 'response' => array ( 'code' => 200, 'message' => 'OK', ), 'cookies' => array ( ), 'filename' => NULL, 'http_response' => WP_HTTP_Requests_Response::__set_state(array( 'response' => Requests_Response::__set_state(array( 'body' => '
recommended_version => 7.3
minimum_version => 5.6.20
is_supported => true
is_secure => true
is_acceptable => true
', 'raw' => 'HTTP/1.1 200 OK Server: nginx Date: Tue, 03 Mar 2020 19:32:23 GMT Content-Type: application/json; charset=utf-8 Transfer-Encoding: chunked Connection: close Vary: Accept-Encoding X-Frame-Options: SAMEORIGIN Content-Encoding: gzip
recommended_version => 7.3
minimum_version => 5.6.20
is_supported => true
is_secure => true
is_acceptable => true
', 'headers' => Requests_Response_Headers::__set_state(array( 'data' => array ( 'server' => array ( 0 => 'nginx', ), 'date' => array ( 0 => 'Tue, 03 Mar 2020 19:32:23 GMT', ), 'content-type' => array ( 0 => 'application/json; charset=utf-8', ), 'vary' => array ( 0 => 'Accept-Encoding', ), 'x-frame-options' => array ( 0 => 'SAMEORIGIN', ), 'content-encoding' => array ( 0 => 'gzip', ), ), )), 'status_code' => 200, 'protocol_version' => 1.1, 'success' => true, 'redirects' => 0, 'url' => 'https://api.wordpress.org/core/serve-happy/1.0/?php_version=7.4.2', 'history' => array ( ), 'cookies' => Requests_Cookie_Jar::__set_state(array( 'cookies' => array ( ), )), )), 'filename' => NULL, 'data' => NULL, 'headers' => NULL, 'status' => NULL, )), ), 'info' => array ( 'url' => 'https://api.wordpress.org/core/serve-happy/1.0/?php_version=7.4.2', 'content_type' => 'application/json; charset=utf-8', 'http_code' => 200, 'header_size' => 241, 'request_size' => 275, 'filetime' => -1, 'ssl_verify_result' => 0, 'redirect_count' => 0, 'total_time' => 0.171669, 'namelookup_time' => 3.9E-5, 'connect_time' => 0.050428, 'pretransfer_time' => 0.120111, 'size_upload' => 0.0, 'size_download' => 102.0, 'speed_download' => 596.0, 'speed_upload' => 0.0, 'download_content_length' => -1.0, 'upload_content_length' => -1.0, 'starttransfer_time' => 0.17159, 'redirect_time' => 0.0, 'redirect_url' => '', 'primary_ip' => '198.143.164.251', 'certinfo' => array ( ), 'primary_port' => 443, 'local_ip' => '167.71.126.23', 'local_port' => 57186, 'http_version' => 2, 'protocol' => 2, 'ssl_verifyresult' => 0, 'scheme' => 'HTTPS', ), )
[03-Mar-2020 19:32:23 UTC] PHP Notice Undefined index: ltime in /sites/thefragens.com/files/wp-content/plugins/query-monitor/output/html/http.php on line 77
[03-Mar-2020 19:32:23 UTC] PHP Notice Undefined index: component in /sites/thefragens.com/files/wp-content/plugins/query-monitor/output/html/http.php on line 123
[03-Mar-2020 19:32:23 UTC] PHP Notice Trying to get property 'name' of non-object in /sites/thefragens.com/files/wp-content/plugins/query-monitor/output/html/http.php on line 160
[03-Mar-2020 19:32:23 UTC] PHP Notice Undefined index: type in /sites/thefragens.com/files/wp-content/plugins/query-monitor/output/html/http.php on line 161
[03-Mar-2020 19:32:23 UTC] PHP Notice Undefined index: ltime in /sites/thefragens.com/files/wp-content/plugins/query-monitor/output/html/http.php on line 162
[03-Mar-2020 19:32:23 UTC] PHP Notice Trying to get property 'context' of non-object in /sites/thefragens.com/files/wp-content/plugins/query-monitor/output/html/http.php on line 164
[03-Mar-2020 19:32:23 UTC] PHP Notice Trying to get property 'name' of non-object in /sites/thefragens.com/files/wp-content/plugins/query-monitor/output/html/http.php on line 296
Query Monitor
The message above was triggered by wp-debugging.

Call stack:

wp_die()
wp-content/plugins/wp-debugging/vendor/norcross/debug-quick-look/includes/parser.php:54
DebugQuickLook\P\run_parse()
wp-content/plugins/wp-debugging/vendor/norcross/debug-quick-look/includes/actions.php:59
DebugQuickLook\A\run_quicklook_action()
wp-includes/class-wp-hook.php:288
do_action('admin_init')
wp-admin/admin.php:17n

Seems to be related to WordPress API calls. Each entry starts with cache purge for searching.

These are the respective $key(s)

[03-Mar-2020 19:44:01 UTC] '1583264640.5742https://api.wordpress.org/plugins/info/1.1/?action=plugin_information&request%5Bslug%5D=query-monitor'
[03-Mar-2020 19:44:01 UTC] '1583264640.7525https://api.wordpress.org/plugins/info/1.1/?action=plugin_information&request%5Bslug%5D=debug-bar'
[03-Mar-2020 19:44:01 UTC] '1583264640.9413https://api.wordpress.org/core/browse-happy/1.1/'
[03-Mar-2020 19:44:01 UTC] '1583264641.1142https://api.wordpress.org/core/serve-happy/1.0/?php_version=7.4.2'

So far adding this as a check also seems to solve the issue.

if (false !== strpos($key, 'api.wordpress.org') ){
	error_log( var_export( $key, true));
	//error_log('cache purge: ' . var_export($row,true) );
	continue;
}

It appears that the last 3 elements of the array $row are missing. These are $row['type'], $row['ltime'], and $row['component'].

I have the exact same problem: the last 3 elements of the array $row are indeed missing ($row['type'], $row['ltime'], and $row['component']).

These missing keys are added by method process of file collectors/http.php.

The reason comes from the fact this method is called once but, at the time it's called, the rows which will later exhibit the problem are not in the $this->data['http'] array. They are added to this array later and the process method is not called again.

I discovered this by adding a echo count($this->data['http']); in the process method and an echo count($data['http']); in the output/html/http.php file.

But it's weird, because this method is called during shutdown action so I see no reason for some HTTP calls to be made after...

  | #0  QM_Collector_HTTP->process() called at [wp-content/plugins/query-monitor/classes/Collectors.php:60]
  | #1  QM_Collectors->process() called at [wp-content/plugins/query-monitor/classes/Dispatcher.php:75]
  | #2  QM_Dispatcher->get_outputters(html) called at [wp-content/plugins/query-monitor/dispatchers/Html.php:276]
  | #3  QM_Dispatcher_Html->before_output() called at [wp-content/plugins/query-monitor/dispatchers/Html.php:241]
  | #4  QM_Dispatcher_Html->dispatch() called at [wp-includes/class-wp-hook.php:287]
  | #5  WP_Hook->apply_filters(, Array ([0] => )) called at [wp-includes/class-wp-hook.php:311]
  | #6  WP_Hook->do_action(Array ([0] => )) called at [wp-includes/plugin.php:478]
  | #7  do_action(shutdown) called at [wp-includes/load.php:960]
  | #8  shutdown_action_hook()

The reason I give in my previous comment explaining the notices is probably the same for everyone: HTTP requests are made during the shutdown process in between the execution of the process method and the display of the html table displaying HTTP requests data.

For me, the culprit was a caching plugin hooked on the style_loader_src filter. Indeed, this filter is normally only called in the header of the page by WordPress but Query Monitor also calls it during the shutdown when it prepares the data to show for styles in method get_dependency_data of file collectors/assets.php.

Solution: The error would not happen if the http collector was the latest to be "processed" in the process method of file classes/Collectors.php.

#0  QM_Collector_Assets->get_dependency_data(_WP_Dependency Object ([handle] => jquery-core,[src] => /wp-includes/js/jquery/jquery.js,[deps] => Array (),[ver] => 1.12.4-wp,[args] => ,[extra] => Array (),[textdomain] => ,[translations_path] => )) called at [wp-content/plugins/query-monitor/collectors/assets.php:125]
#1  QM_Collector_Assets->process() called at [wp-content/plugins/query-monitor/classes/Collectors.php:60]
#2  QM_Collectors->process() called at [wp-content/plugins/query-monitor/classes/Dispatcher.php:75]
#3  QM_Dispatcher->get_outputters(html) called at [wp-content/plugins/query-monitor/dispatchers/Html.php:276]
#4  QM_Dispatcher_Html->before_output() called at [wp-content/plugins/query-monitor/dispatchers/Html.php:241]
#5  QM_Dispatcher_Html->dispatch() called at [wp-includes/class-wp-hook.php:287]
#6  WP_Hook->apply_filters(, Array ([0] => )) called at [wp-includes/class-wp-hook.php:311]
#7  WP_Hook->do_action(Array ([0] => )) called at [wp-includes/plugin.php:478]
#8  do_action(shutdown) called at [wp-includes/load.php:960]
#9  shutdown_action_hook()