diff --git a/resources/sql/autopatches/20150430.multimeter.1.sql b/resources/sql/autopatches/20150430.multimeter.1.sql
new file mode 100644
index 0000000000..5929d4e31f
--- /dev/null
+++ b/resources/sql/autopatches/20150430.multimeter.1.sql
@@ -0,0 +1,14 @@
+CREATE TABLE {$NAMESPACE}_multimeter.multimeter_event (
+  id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+  eventType INT UNSIGNED NOT NULL,
+  eventLabelID INT UNSIGNED NOT NULL,
+  resourceCost BIGINT NOT NULL,
+  sampleRate INT UNSIGNED NOT NULL,
+  eventContextID INT UNSIGNED NOT NULL,
+  eventHostID INT UNSIGNED NOT NULL,
+  eventViewerID INT UNSIGNED NOT NULL,
+  epoch INT UNSIGNED NOT NULL,
+  requestKey BINARY(12) NOT NULL,
+  KEY `key_request` (requestKey),
+  KEY `key_type` (eventType, epoch)
+) ENGINE=InnoDB, COLLATE {$COLLATE_TEXT};
diff --git a/resources/sql/autopatches/20150430.multimeter.2.host.sql b/resources/sql/autopatches/20150430.multimeter.2.host.sql
new file mode 100644
index 0000000000..779bde1198
--- /dev/null
+++ b/resources/sql/autopatches/20150430.multimeter.2.host.sql
@@ -0,0 +1,6 @@
+CREATE TABLE {$NAMESPACE}_multimeter.multimeter_host (
+  id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+  name LONGTEXT COLLATE {$COLLATE_TEXT} NOT NULL,
+  nameHash BINARY(12) NOT NULL,
+  UNIQUE KEY `key_hash` (nameHash)
+) ENGINE=InnoDB, COLLATE {$COLLATE_TEXT};
diff --git a/resources/sql/autopatches/20150430.multimeter.3.viewer.sql b/resources/sql/autopatches/20150430.multimeter.3.viewer.sql
new file mode 100644
index 0000000000..5dfa5f18d5
--- /dev/null
+++ b/resources/sql/autopatches/20150430.multimeter.3.viewer.sql
@@ -0,0 +1,6 @@
+CREATE TABLE {$NAMESPACE}_multimeter.multimeter_viewer (
+  id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+  name LONGTEXT COLLATE {$COLLATE_TEXT} NOT NULL,
+  nameHash BINARY(12) NOT NULL,
+  UNIQUE KEY `key_hash` (nameHash)
+) ENGINE=InnoDB, COLLATE {$COLLATE_TEXT};
diff --git a/resources/sql/autopatches/20150430.multimeter.4.context.sql b/resources/sql/autopatches/20150430.multimeter.4.context.sql
new file mode 100644
index 0000000000..8171bbefb3
--- /dev/null
+++ b/resources/sql/autopatches/20150430.multimeter.4.context.sql
@@ -0,0 +1,6 @@
+CREATE TABLE {$NAMESPACE}_multimeter.multimeter_context (
+  id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+  name LONGTEXT COLLATE {$COLLATE_TEXT} NOT NULL,
+  nameHash BINARY(12) NOT NULL,
+  UNIQUE KEY `key_hash` (nameHash)
+) ENGINE=InnoDB, COLLATE {$COLLATE_TEXT};
diff --git a/resources/sql/autopatches/20150430.multimeter.5.label.sql b/resources/sql/autopatches/20150430.multimeter.5.label.sql
new file mode 100644
index 0000000000..c1da143456
--- /dev/null
+++ b/resources/sql/autopatches/20150430.multimeter.5.label.sql
@@ -0,0 +1,6 @@
+CREATE TABLE {$NAMESPACE}_multimeter.multimeter_label (
+  id INT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+  name LONGTEXT COLLATE {$COLLATE_TEXT} NOT NULL,
+  nameHash BINARY(12) NOT NULL,
+  UNIQUE KEY `key_hash` (nameHash)
+) ENGINE=InnoDB, COLLATE {$COLLATE_TEXT};
diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
index 189da4ee91..3337311a0b 100644
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -1080,6 +1080,17 @@ phutil_register_library_map(array(
     'MetaMTAMailSentGarbageCollector' => 'applications/metamta/garbagecollector/MetaMTAMailSentGarbageCollector.php',
     'MetaMTANotificationType' => 'applications/metamta/constants/MetaMTANotificationType.php',
     'MetaMTAReceivedMailStatus' => 'applications/metamta/constants/MetaMTAReceivedMailStatus.php',
+    'MultimeterContext' => 'applications/multimeter/storage/MultimeterContext.php',
+    'MultimeterControl' => 'applications/multimeter/data/MultimeterControl.php',
+    'MultimeterController' => 'applications/multimeter/controller/MultimeterController.php',
+    'MultimeterDAO' => 'applications/multimeter/storage/MultimeterDAO.php',
+    'MultimeterDimension' => 'applications/multimeter/storage/MultimeterDimension.php',
+    'MultimeterEvent' => 'applications/multimeter/storage/MultimeterEvent.php',
+    'MultimeterEventGarbageCollector' => 'applications/multimeter/garbagecollector/MultimeterEventGarbageCollector.php',
+    'MultimeterHost' => 'applications/multimeter/storage/MultimeterHost.php',
+    'MultimeterLabel' => 'applications/multimeter/storage/MultimeterLabel.php',
+    'MultimeterSampleController' => 'applications/multimeter/controller/MultimeterSampleController.php',
+    'MultimeterViewer' => 'applications/multimeter/storage/MultimeterViewer.php',
     'NuanceConduitAPIMethod' => 'applications/nuance/conduit/NuanceConduitAPIMethod.php',
     'NuanceController' => 'applications/nuance/controller/NuanceController.php',
     'NuanceCreateItemConduitAPIMethod' => 'applications/nuance/conduit/NuanceCreateItemConduitAPIMethod.php',
@@ -2062,6 +2073,7 @@ phutil_register_library_map(array(
     'PhabricatorMetronomicTriggerClock' => 'infrastructure/daemon/workers/clock/PhabricatorMetronomicTriggerClock.php',
     'PhabricatorMultiColumnUIExample' => 'applications/uiexample/examples/PhabricatorMultiColumnUIExample.php',
     'PhabricatorMultiFactorSettingsPanel' => 'applications/settings/panel/PhabricatorMultiFactorSettingsPanel.php',
+    'PhabricatorMultimeterApplication' => 'applications/multimeter/application/PhabricatorMultimeterApplication.php',
     'PhabricatorMustVerifyEmailController' => 'applications/auth/controller/PhabricatorMustVerifyEmailController.php',
     'PhabricatorMySQLConfigOptions' => 'applications/config/option/PhabricatorMySQLConfigOptions.php',
     'PhabricatorMySQLFileStorageEngine' => 'applications/files/engine/PhabricatorMySQLFileStorageEngine.php',
@@ -4381,6 +4393,16 @@ phutil_register_library_map(array(
     'MetaMTAMailSentGarbageCollector' => 'PhabricatorGarbageCollector',
     'MetaMTANotificationType' => 'MetaMTAConstants',
     'MetaMTAReceivedMailStatus' => 'MetaMTAConstants',
+    'MultimeterContext' => 'MultimeterDimension',
+    'MultimeterController' => 'PhabricatorController',
+    'MultimeterDAO' => 'PhabricatorLiskDAO',
+    'MultimeterDimension' => 'MultimeterDAO',
+    'MultimeterEvent' => 'MultimeterDAO',
+    'MultimeterEventGarbageCollector' => 'PhabricatorGarbageCollector',
+    'MultimeterHost' => 'MultimeterDimension',
+    'MultimeterLabel' => 'MultimeterDimension',
+    'MultimeterSampleController' => 'MultimeterController',
+    'MultimeterViewer' => 'MultimeterDimension',
     'NuanceConduitAPIMethod' => 'ConduitAPIMethod',
     'NuanceController' => 'PhabricatorController',
     'NuanceCreateItemConduitAPIMethod' => 'NuanceConduitAPIMethod',
@@ -5443,6 +5465,7 @@ phutil_register_library_map(array(
     'PhabricatorMetronomicTriggerClock' => 'PhabricatorTriggerClock',
     'PhabricatorMultiColumnUIExample' => 'PhabricatorUIExample',
     'PhabricatorMultiFactorSettingsPanel' => 'PhabricatorSettingsPanel',
+    'PhabricatorMultimeterApplication' => 'PhabricatorApplication',
     'PhabricatorMustVerifyEmailController' => 'PhabricatorAuthController',
     'PhabricatorMySQLConfigOptions' => 'PhabricatorApplicationConfigOptions',
     'PhabricatorMySQLFileStorageEngine' => 'PhabricatorFileStorageEngine',
diff --git a/src/aphront/configuration/AphrontApplicationConfiguration.php b/src/aphront/configuration/AphrontApplicationConfiguration.php
index beea90a36b..f5a34ae3d6 100644
--- a/src/aphront/configuration/AphrontApplicationConfiguration.php
+++ b/src/aphront/configuration/AphrontApplicationConfiguration.php
@@ -58,8 +58,15 @@ abstract class AphrontApplicationConfiguration {
    * @phutil-external-symbol class PhabricatorStartup
    */
   public static function runHTTPRequest(AphrontHTTPSink $sink) {
+    $multimeter = MultimeterControl::newInstance();
+    $multimeter->setEventContext('<http-init>');
+    $multimeter->setEventViewer('<none>');
+
     PhabricatorEnv::initializeWebEnvironment();
 
+    $multimeter->setSampleRate(
+      PhabricatorEnv::getEnvConfig('debug.sample-rate'));
+
     $debug_time_limit = PhabricatorEnv::getEnvConfig('debug.time-limit');
     if ($debug_time_limit) {
       PhabricatorStartup::setDebugTimeLimit($debug_time_limit);
@@ -135,6 +142,8 @@ abstract class AphrontApplicationConfiguration {
 
     $access_log->write();
 
+    $multimeter->saveEvents();
+
     DarkConsoleXHProfPluginAPI::saveProfilerSample($access_log);
 
     // Add points to the rate limits for this request.
diff --git a/src/applications/celerity/CelerityStaticResourceResponse.php b/src/applications/celerity/CelerityStaticResourceResponse.php
index 0d4fafdfd7..f3412ad4cc 100644
--- a/src/applications/celerity/CelerityStaticResourceResponse.php
+++ b/src/applications/celerity/CelerityStaticResourceResponse.php
@@ -144,6 +144,9 @@ final class CelerityStaticResourceResponse {
     $uri = $this->getURI($map, $name);
     $type = $map->getResourceTypeForName($name);
 
+    $event_type = MultimeterEvent::TYPE_STATIC_RESOURCE;
+    MultimeterControl::getInstance()->newEvent($event_type, 'rsrc.'.$name, 1);
+
     switch ($type) {
       case 'css':
         return phutil_tag(
diff --git a/src/applications/config/option/PhabricatorDeveloperConfigOptions.php b/src/applications/config/option/PhabricatorDeveloperConfigOptions.php
index 665c38e0bd..c2063ec87c 100644
--- a/src/applications/config/option/PhabricatorDeveloperConfigOptions.php
+++ b/src/applications/config/option/PhabricatorDeveloperConfigOptions.php
@@ -118,6 +118,27 @@ final class PhabricatorDeveloperConfigOptions
             "data to look at eventually). In development, it may be useful to ".
             "set it to 1 in order to debug performance problems.\n\n".
             "NOTE: You must install XHProf for profiling to work.")),
+      $this->newOption('debug.sample-rate', 'int', 1000)
+        ->setLocked(true)
+        ->addExample(0, pht('No performance sampling.'))
+        ->addExample(1, pht('Sample every request (slow).'))
+        ->addExample(1000, pht('Sample 0.1%% of requests.'))
+        ->setSummary(pht('Automatically sample some fraction of requests.'))
+        ->setDescription(
+          pht(
+            "The Multimeter application collects performance samples. You ".
+            "can use this data to help you understand what Phabricator is ".
+            "spending time and resources doing, and to identify problematic ".
+            "access patterns.".
+            "\n\n".
+            "This option controls how frequently sampling activates. Set it ".
+            "to some positive integer N to sample every 1 / N pages.".
+            "\n\n".
+            "For most installs, the default value (1 sample per 1000 pages) ".
+            "should collect enough data to be useful without requiring much ".
+            "storage or meaningfully impacting performance. If you're ".
+            "investigating performance issues, you can adjust the rate ".
+            "in order to collect more data.")),
       $this->newOption('phabricator.developer-mode', 'bool', false)
         ->setBoolOptions(
           array(
diff --git a/src/applications/multimeter/application/PhabricatorMultimeterApplication.php b/src/applications/multimeter/application/PhabricatorMultimeterApplication.php
new file mode 100644
index 0000000000..5675668fc2
--- /dev/null
+++ b/src/applications/multimeter/application/PhabricatorMultimeterApplication.php
@@ -0,0 +1,46 @@
+<?php
+
+final class PhabricatorMultimeterApplication
+  extends PhabricatorApplication {
+
+  public function getName() {
+    return pht('Multimeter');
+  }
+
+  public function getBaseURI() {
+    return '/multimeter/';
+  }
+
+  public function getFontIcon() {
+    return 'fa-motorcycle';
+  }
+
+  public function isPrototype() {
+    return true;
+  }
+
+  public function getTitleGlyph() {
+    return "\xE2\x8F\xB3";
+  }
+
+  public function getApplicationGroup() {
+    return self::GROUP_DEVELOPER;
+  }
+
+  public function getShortDescription() {
+    return pht('Performance Sampler');
+  }
+
+  public function getRemarkupRules() {
+    return array();
+  }
+
+  public function getRoutes() {
+    return array(
+      '/multimeter/' => array(
+        '' => 'MultimeterSampleController',
+      ),
+    );
+  }
+
+}
diff --git a/src/applications/multimeter/controller/MultimeterController.php b/src/applications/multimeter/controller/MultimeterController.php
new file mode 100644
index 0000000000..3988bc18d2
--- /dev/null
+++ b/src/applications/multimeter/controller/MultimeterController.php
@@ -0,0 +1,70 @@
+<?php
+
+abstract class MultimeterController extends PhabricatorController {
+
+  private $dimensions = array();
+
+  protected function loadDimensions(array $rows) {
+    if (!$rows) {
+      return;
+    }
+
+    $map = array(
+      'eventLabelID' => new MultimeterLabel(),
+      'eventViewerID' => new MultimeterViewer(),
+      'eventHostID' => new MultimeterHost(),
+      'eventContextID' => new MultimeterContext(),
+    );
+
+    $ids = array();
+    foreach ($map as $key => $object) {
+      foreach ($rows as $row) {
+        $ids[$key][] = $row[$key];
+      }
+    }
+
+    foreach ($ids as $key => $list) {
+      $object = $map[$key];
+      if (empty($this->dimensions[$key])) {
+        $this->dimensions[$key] = array();
+      }
+      $this->dimensions[$key] += $object->loadAllWhere(
+        'id IN (%Ld)',
+        $list);
+    }
+  }
+
+  protected function getLabelDimension($id) {
+    if (empty($this->dimensions['eventLabelID'][$id])) {
+      return $this->newMissingDimension(new MultimeterLabel(), $id);
+    }
+    return $this->dimensions['eventLabelID'][$id];
+  }
+
+  protected function getViewerDimension($id) {
+    if (empty($this->dimensions['eventViewerID'][$id])) {
+      return $this->newMissingDimension(new MultimeterViewer(), $id);
+    }
+    return $this->dimensions['eventViewerID'][$id];
+  }
+
+  protected function getHostDimension($id) {
+    if (empty($this->dimensions['eventHostID'][$id])) {
+      return $this->newMissingDimension(new MultimeterHost(), $id);
+    }
+    return $this->dimensions['eventHostID'][$id];
+  }
+
+  protected function getContextDimension($id) {
+    if (empty($this->dimensions['eventContextID'][$id])) {
+      return $this->newMissingDimension(new MultimeterContext(), $id);
+    }
+    return $this->dimensions['eventContextID'][$id];
+  }
+
+  private function newMissingDimension(MultimeterDimension $dim, $id) {
+    $dim->setName('<missing:'.$id.'>');
+    return $dim;
+  }
+
+}
diff --git a/src/applications/multimeter/controller/MultimeterSampleController.php b/src/applications/multimeter/controller/MultimeterSampleController.php
new file mode 100644
index 0000000000..b476db3113
--- /dev/null
+++ b/src/applications/multimeter/controller/MultimeterSampleController.php
@@ -0,0 +1,85 @@
+<?php
+
+final class MultimeterSampleController extends MultimeterController {
+
+  public function shouldAllowPublic() {
+    return true;
+  }
+
+  public function handleRequest(AphrontRequest $request) {
+    $viewer = $this->getViewer();
+
+    $table = new MultimeterEvent();
+    $conn = $table->establishConnection('r');
+    $data = queryfx_all(
+      $conn,
+      'SELECT * FROM %T ORDER BY id DESC LIMIT 100',
+      $table->getTableName());
+
+    $this->loadDimensions($data);
+
+    $rows = array();
+    foreach ($data as $row) {
+      $rows[] = array(
+        $row['id'],
+        $row['requestKey'],
+        $this->getViewerDimension($row['eventViewerID'])->getName(),
+        $this->getContextDimension($row['eventContextID'])->getName(),
+        $this->getHostDimension($row['eventHostID'])->getName(),
+        MultimeterEvent::getEventTypeName($row['eventType']),
+        $this->getLabelDimension($row['eventLabelID'])->getName(),
+        MultimeterEvent::formatResourceCost(
+          $viewer,
+          $row['eventType'],
+          $row['resourceCost']),
+        $row['sampleRate'],
+        phabricator_datetime($row['epoch'], $viewer),
+      );
+    }
+
+    $table = id(new AphrontTableView($rows))
+      ->setHeaders(
+        array(
+          pht('ID'),
+          pht('Request'),
+          pht('Viewer'),
+          pht('Context'),
+          pht('Host'),
+          pht('Type'),
+          pht('Label'),
+          pht('Cost'),
+          pht('Rate'),
+          pht('Epoch'),
+        ))
+      ->setColumnClasses(
+        array(
+          null,
+          null,
+          null,
+          null,
+          null,
+          null,
+          'wide',
+          'n',
+          'n',
+          null,
+        ));
+
+    $box = id(new PHUIObjectBoxView())
+      ->setHeaderText(pht('Samples'))
+      ->appendChild($table);
+
+    $crumbs = $this->buildApplicationCrumbs();
+    $crumbs->addTextCrumb(pht('Samples'));
+
+    return $this->buildApplicationPage(
+      array(
+        $crumbs,
+        $box,
+      ),
+      array(
+        'title' => pht('Samples'),
+      ));
+  }
+
+}
diff --git a/src/applications/multimeter/data/MultimeterControl.php b/src/applications/multimeter/data/MultimeterControl.php
new file mode 100644
index 0000000000..a7838ca859
--- /dev/null
+++ b/src/applications/multimeter/data/MultimeterControl.php
@@ -0,0 +1,203 @@
+<?php
+
+final class MultimeterControl {
+
+  private static $instance;
+
+  private $events = array();
+  private $sampleRate;
+  private $pauseDepth;
+
+  private $eventViewer;
+  private $eventContext;
+
+  private function __construct() {
+    // Private.
+  }
+
+  public static function newInstance() {
+    $instance = new MultimeterControl();
+
+    // NOTE: We don't set the sample rate yet. This allows the multimeter to
+    // be initialized and begin recording events, then make a decision about
+    // whether the page will be sampled or not later on (once we've loaded
+    // enough configuration).
+
+    self::$instance = $instance;
+    return self::getInstance();
+  }
+
+  public static function getInstance() {
+    return self::$instance;
+  }
+
+  public function isActive() {
+    return ($this->sampleRate !== 0) && ($this->pauseDepth == 0);
+  }
+
+  public function setSampleRate($rate) {
+    if ($rate && (mt_rand(1, $rate) == $rate)) {
+      $sample_rate = $rate;
+    } else {
+      $sample_rate = 0;
+    }
+
+    $this->sampleRate = $sample_rate;
+
+    return;
+  }
+
+  public function pauseMultimeter() {
+    $this->pauseDepth++;
+    return $this;
+  }
+
+  public function unpauseMultimeter() {
+    if (!$this->pauseDepth) {
+      throw new Exception(pht('Trying to unpause an active multimeter!'));
+    }
+    $this->pauseDepth--;
+    return $this;
+  }
+
+
+  public function newEvent($type, $label, $cost) {
+    if (!$this->isActive()) {
+      return null;
+    }
+
+    $event = id(new MultimeterEvent())
+      ->setEventType($type)
+      ->setEventLabel($label)
+      ->setResourceCost($cost)
+      ->setEpoch(PhabricatorTime::getNow());
+
+    $this->events[] = $event;
+
+    return $event;
+  }
+
+  public function saveEvents() {
+    if (!$this->isActive()) {
+      return;
+    }
+
+    $events = $this->events;
+    if (!$events) {
+      return;
+    }
+
+    if ($this->sampleRate === null) {
+      throw new Exception(pht('Call setSampleRate() before saving events!'));
+    }
+
+    // Don't sample any of this stuff.
+    $this->pauseMultimeter();
+
+    $use_scope = AphrontWriteGuard::isGuardActive();
+    if ($use_scope) {
+      $unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
+    } else {
+      AphrontWriteGuard::allowDangerousUnguardedWrites(true);
+    }
+
+    $caught = null;
+    try {
+      $this->writeEvents();
+    } catch (Exception $ex) {
+      $caught = $ex;
+    }
+
+    if ($use_scope) {
+      unset($unguarded);
+    } else {
+      AphrontWriteGuard::allowDangerousUnguardedWrites(false);
+    }
+
+    $this->unpauseMultimeter();
+
+    if ($caught) {
+      throw $caught;
+    }
+  }
+
+  private function writeEvents() {
+    $events = $this->events;
+
+    $random = Filesystem::readRandomBytes(32);
+    $request_key = PhabricatorHash::digestForIndex($random);
+
+    $host_id = $this->loadHostID(php_uname('n'));
+    $context_id = $this->loadEventContextID($this->eventContext);
+    $viewer_id = $this->loadEventViewerID($this->eventViewer);
+    $label_map = $this->loadEventLabelIDs(mpull($events, 'getEventLabel'));
+
+    foreach ($events as $event) {
+      $event
+        ->setRequestKey($request_key)
+        ->setSampleRate($this->sampleRate)
+        ->setEventHostID($host_id)
+        ->setEventContextID($context_id)
+        ->setEventViewerID($viewer_id)
+        ->setEventLabelID($label_map[$event->getEventLabel()])
+        ->save();
+    }
+  }
+
+  public function setEventContext($event_context) {
+    $this->eventContext = $event_context;
+    return $this;
+  }
+
+  public function setEventViewer($viewer) {
+    $this->eventViewer = $viewer;
+    return $this;
+  }
+
+  private function loadHostID($host) {
+    $map = $this->loadDimensionMap(new MultimeterHost(), array($host));
+    return idx($map, $host);
+  }
+
+  private function loadEventViewerID($viewer) {
+    $map = $this->loadDimensionMap(new MultimeterViewer(), array($viewer));
+    return idx($map, $viewer);
+  }
+
+  private function loadEventContextID($context) {
+    $map = $this->loadDimensionMap(new MultimeterContext(), array($context));
+    return idx($map, $context);
+  }
+
+  private function loadEventLabelIDs(array $labels) {
+    return $this->loadDimensionMap(new MultimeterLabel(), $labels);
+  }
+
+  private function loadDimensionMap(MultimeterDimension $table, array $names) {
+    $hashes = array();
+    foreach ($names as $name) {
+      $hashes[] = PhabricatorHash::digestForIndex($name);
+    }
+
+    $objects = $table->loadAllWhere('nameHash IN (%Ls)', $hashes);
+    $map = mpull($objects, 'getID', 'getName');
+
+    $need = array();
+    foreach ($names as $name) {
+      if (isset($map[$name])) {
+        continue;
+      }
+      $need[] = $name;
+    }
+
+    foreach ($need as $name) {
+      $object = id(clone $table)
+        ->setName($name)
+        ->save();
+      $map[$name] = $object->getID();
+    }
+
+    return $map;
+  }
+
+}
diff --git a/src/applications/multimeter/garbagecollector/MultimeterEventGarbageCollector.php b/src/applications/multimeter/garbagecollector/MultimeterEventGarbageCollector.php
new file mode 100644
index 0000000000..3b8095ce05
--- /dev/null
+++ b/src/applications/multimeter/garbagecollector/MultimeterEventGarbageCollector.php
@@ -0,0 +1,21 @@
+<?php
+
+final class MultimeterEventGarbageCollector
+  extends PhabricatorGarbageCollector {
+
+  public function collectGarbage() {
+    $ttl = phutil_units('90 days in seconds');
+
+    $table = new MultimeterEvent();
+    $conn_w = $table->establishConnection('w');
+
+    queryfx(
+      $conn_w,
+      'DELETE FROM %T WHERE epoch < %d LIMIT 100',
+      $table->getTableName(),
+      PhabricatorTime::getNow() - $ttl);
+
+    return ($conn_w->getAffectedRows() == 100);
+  }
+
+}
diff --git a/src/applications/multimeter/storage/MultimeterContext.php b/src/applications/multimeter/storage/MultimeterContext.php
new file mode 100644
index 0000000000..b7e1517d55
--- /dev/null
+++ b/src/applications/multimeter/storage/MultimeterContext.php
@@ -0,0 +1,3 @@
+<?php
+
+final class MultimeterContext extends MultimeterDimension {}
diff --git a/src/applications/multimeter/storage/MultimeterDAO.php b/src/applications/multimeter/storage/MultimeterDAO.php
new file mode 100644
index 0000000000..282d09eb74
--- /dev/null
+++ b/src/applications/multimeter/storage/MultimeterDAO.php
@@ -0,0 +1,9 @@
+<?php
+
+abstract class MultimeterDAO extends PhabricatorLiskDAO {
+
+  public function getApplicationName() {
+    return 'multimeter';
+  }
+
+}
diff --git a/src/applications/multimeter/storage/MultimeterDimension.php b/src/applications/multimeter/storage/MultimeterDimension.php
new file mode 100644
index 0000000000..8b3428641e
--- /dev/null
+++ b/src/applications/multimeter/storage/MultimeterDimension.php
@@ -0,0 +1,29 @@
+<?php
+
+abstract class MultimeterDimension extends MultimeterDAO {
+
+  protected $name;
+  protected $nameHash;
+
+  public function setName($name) {
+    $this->nameHash = PhabricatorHash::digestForIndex($name);
+    return parent::setName($name);
+  }
+
+  protected function getConfiguration() {
+    return array(
+      self::CONFIG_TIMESTAMPS => false,
+      self::CONFIG_COLUMN_SCHEMA => array(
+        'name' => 'text',
+        'nameHash' => 'bytes12',
+      ),
+      self::CONFIG_KEY_SCHEMA => array(
+        'key_hash' => array(
+          'columns' => array('nameHash'),
+          'unique' => true,
+        ),
+      ),
+    ) + parent::getConfiguration();
+  }
+
+}
diff --git a/src/applications/multimeter/storage/MultimeterEvent.php b/src/applications/multimeter/storage/MultimeterEvent.php
new file mode 100644
index 0000000000..1f7c27cbaa
--- /dev/null
+++ b/src/applications/multimeter/storage/MultimeterEvent.php
@@ -0,0 +1,71 @@
+<?php
+
+final class MultimeterEvent extends MultimeterDAO {
+
+  const TYPE_STATIC_RESOURCE = 0;
+
+  protected $eventType;
+  protected $eventLabelID;
+  protected $resourceCost;
+  protected $sampleRate;
+  protected $eventContextID;
+  protected $eventHostID;
+  protected $eventViewerID;
+  protected $epoch;
+  protected $requestKey;
+
+  private $eventLabel;
+
+  public function setEventLabel($event_label) {
+    $this->eventLabel = $event_label;
+    return $this;
+  }
+
+  public function getEventLabel() {
+    return $this->eventLabel;
+  }
+
+  public static function getEventTypeName($type) {
+    switch ($type) {
+      case self::TYPE_STATIC_RESOURCE:
+        return pht('Static Resource');
+    }
+
+    return pht('Unknown ("%s")', $type);
+  }
+
+  public static function formatResourceCost(
+    PhabricatorUser $viewer,
+    $type,
+    $cost) {
+
+    switch ($type) {
+      case self::TYPE_STATIC_RESOURCE:
+        return pht('%s Req', new PhutilNumber($cost));
+    }
+
+    return pht('%s Unit(s)', new PhutilNumber($cost));
+  }
+
+
+  protected function getConfiguration() {
+    return array(
+      self::CONFIG_TIMESTAMPS => false,
+      self::CONFIG_COLUMN_SCHEMA => array(
+        'eventType' => 'uint32',
+        'resourceCost' => 'sint64',
+        'sampleRate' => 'uint32',
+        'requestKey' => 'bytes12',
+      ),
+      self::CONFIG_KEY_SCHEMA => array(
+        'key_request' => array(
+          'columns' => array('requestKey'),
+        ),
+        'key_type' => array(
+          'columns' => array('eventType', 'epoch'),
+        ),
+      ),
+    ) + parent::getConfiguration();
+  }
+
+}
diff --git a/src/applications/multimeter/storage/MultimeterHost.php b/src/applications/multimeter/storage/MultimeterHost.php
new file mode 100644
index 0000000000..5bda575711
--- /dev/null
+++ b/src/applications/multimeter/storage/MultimeterHost.php
@@ -0,0 +1,3 @@
+<?php
+
+final class MultimeterHost extends MultimeterDimension {}
diff --git a/src/applications/multimeter/storage/MultimeterLabel.php b/src/applications/multimeter/storage/MultimeterLabel.php
new file mode 100644
index 0000000000..782267a682
--- /dev/null
+++ b/src/applications/multimeter/storage/MultimeterLabel.php
@@ -0,0 +1,3 @@
+<?php
+
+final class MultimeterLabel extends MultimeterDimension {}
diff --git a/src/applications/multimeter/storage/MultimeterViewer.php b/src/applications/multimeter/storage/MultimeterViewer.php
new file mode 100644
index 0000000000..4644d5854f
--- /dev/null
+++ b/src/applications/multimeter/storage/MultimeterViewer.php
@@ -0,0 +1,3 @@
+<?php
+
+final class MultimeterViewer extends MultimeterDimension {}
diff --git a/src/infrastructure/storage/patch/PhabricatorBuiltinPatchList.php b/src/infrastructure/storage/patch/PhabricatorBuiltinPatchList.php
index c07a139344..581b7f9070 100644
--- a/src/infrastructure/storage/patch/PhabricatorBuiltinPatchList.php
+++ b/src/infrastructure/storage/patch/PhabricatorBuiltinPatchList.php
@@ -104,6 +104,7 @@ final class PhabricatorBuiltinPatchList extends PhabricatorSQLPatchList {
       'db.system' => array(),
       'db.fund' => array(),
       'db.almanac' => array(),
+      'db.multimeter' => array(),
       '0000.legacy.sql' => array(
         'legacy' => 0,
       ),