1. PHP 8.2.5; Phorge at `e9e2c954132cf9d548e0ac9eb7f75c88f8308c8d`
2. `./bin/config set phabricator.show-prototypes true`
3. Go to http://phorge.localhost/applications/
4. Under `Developer Tools`, select `Multimeter` to go to http://phorge.localhost/multimeter/
```
[2023-05-06 22:30:04] EXCEPTION: (RuntimeException) explode(): Passing null to parameter #2 ($string) of type string is deprecated at [<arcanist>/src/error/PhutilErrorHandler.php:261]
arcanist(head=renderDashboardTabPanelContent, ref.master=d47289622650, ref.renderDashboardTabPanelContent=d47289622650), phorge(head=multimeter, ref.master=e9e2c954132c, ref.multimeter=e9e2c954132c)
#0 <#2> PhutilErrorHandler::handleError(integer, string, string, integer) called at [<arcanist>/src/error/PhutilErrorHandler.php:261]
#1 <#2> explode(string, NULL) called at [<phorge>/src/applications/multimeter/controller/MultimeterSampleController.php:13]
#2 <#2> MultimeterSampleController::handleRequest(AphrontRequest) called at [<phorge>/src/aphront/configuration/AphrontApplicationConfiguration.php:284]
#3 phlog(RuntimeException) called at [<phorge>/src/aphront/handler/PhabricatorDefaultRequestExceptionHandler.php:41]
#4 PhabricatorDefaultRequestExceptionHandler::handleRequestThrowable(AphrontRequest, RuntimeException) called at [<phorge>/src/aphront/configuration/AphrontApplicationConfiguration.php:751]
#5 AphrontApplicationConfiguration::handleThrowable(RuntimeException) called at [<phorge>/src/aphront/configuration/AphrontApplicationConfiguration.php:296]
#6 AphrontApplicationConfiguration::processRequest(AphrontRequest, PhutilDeferredLog, AphrontPHPHTTPSink, MultimeterControl) called at [<phorge>/src/aphront/configuration/AphrontApplicationConfiguration.php:203]
#7 AphrontApplicationConfiguration::runHTTPRequest(AphrontPHPHTTPSink) called at [<phorge>/webroot/index.php:35]
[2023-05-06 22:30:04] EXCEPTION: (PhutilAggregateException) Encountered a processing exception, then another exception when trying to build a response for the first exception.
- RuntimeException: file_exists(): Passing null to parameter #1 ($filename) of type string is deprecated
- RuntimeException: explode(): Passing null to parameter #2 ($string) of type string is deprecated at [<phorge>/src/aphront/configuration/AphrontApplicationConfiguration.php:316]
arcanist(head=renderDashboardTabPanelContent, ref.master=d47289622650, ref.renderDashboardTabPanelContent=d47289622650), phorge(head=multimeter, ref.master=e9e2c954132c, ref.multimeter=e9e2c954132c)
#0 <#4> explode(string, NULL) called at [<phorge>/src/applications/multimeter/controller/MultimeterSampleController.php:13]
#1 <#4> MultimeterSampleController::handleRequest(AphrontRequest) called at [<phorge>/src/aphront/configuration/AphrontApplicationConfiguration.php:284]
#2 <#3> PhutilErrorHandler::handleError(integer, string, string, integer) called at [<arcanist>/src/error/PhutilErrorHandler.php:261]
#3 <#3> file_exists(NULL) called at [<arcanist>/src/filesystem/Filesystem.php:1068]
#4 <#3> Filesystem::pathExists(NULL) called at [<arcanist>/src/filesystem/Filesystem.php:1169]
#5 <#3> Filesystem::assertExists(NULL) called at [<arcanist>/src/filesystem/Filesystem.php:1020]
#6 <#3> Filesystem::isDescendant(NULL, string) called at [<phorge>/src/view/widget/AphrontStackTraceView.php:33]
#7 <#3> AphrontStackTraceView::render() called at [<phorge>/src/view/AphrontView.php:222]
#8 <#3> AphrontView::producePhutilSafeHTML() called at [<phorge>/src/infrastructure/markup/render.php:115]
#9 <#3> phutil_escape_html(AphrontStackTraceView) called at [<phorge>/src/infrastructure/markup/render.php:139]
#10 <#3> phutil_escape_html(array) called at [<phorge>/src/infrastructure/markup/render.php:97]
#11 <#3> phutil_tag(string, array, array) called at [<phorge>/src/aphront/handler/PhabricatorDefaultRequestExceptionHandler.php:62]
#12 <#3> PhabricatorDefaultRequestExceptionHandler::handleRequestThrowable(AphrontRequest, RuntimeException) called at [<phorge>/src/aphront/configuration/AphrontApplicationConfiguration.php:751]
#13 <#3> AphrontApplicationConfiguration::handleThrowable(RuntimeException) called at [<phorge>/src/aphront/configuration/AphrontApplicationConfiguration.php:296]
#14 <#2> AphrontApplicationConfiguration::processRequest(AphrontRequest, PhutilDeferredLog, AphrontPHPHTTPSink, MultimeterControl) called at [<phorge>/src/aphront/configuration/AphrontApplicationConfiguration.php:203]
#15 <#2> AphrontApplicationConfiguration::runHTTPRequest(AphrontPHPHTTPSink) called at [<phorge>/webroot/index.php:35]
#16 phlog(PhutilAggregateException) called at [<phorge>/src/aphront/response/AphrontUnhandledExceptionResponse.php:32]
#17 AphrontUnhandledExceptionResponse::setException(PhutilAggregateException) called at [<phorge>/webroot/index.php:46]
```
Fix that exception; afterwards page `Samples (Fri, May 5, 10:33 PM - Sat, May 6, 10:33 PM)` at http://phorge.localhost/multimeter/ gets rendered in web browser.