diff --git a/lib/collector.rb b/lib/collector.rb
index fd29da6..b1e379d 100644
--- a/lib/collector.rb
+++ b/lib/collector.rb
@@ -13,6 +13,7 @@ def initialize
       @page_views = nil
       @http_requests = nil
       @http_duration_seconds = nil
+      @http_application_duration_seconds = nil
       @http_redis_duration_seconds = nil
       @http_sql_duration_seconds = nil
       @http_net_duration_seconds = nil
@@ -226,12 +227,25 @@ def ensure_web_metrics
 
         @http_duration_seconds =
           Summary.new("http_duration_seconds", "Time spent in HTTP reqs in seconds")
+
+        @http_application_duration_seconds =
+          Summary.new(
+            "http_application_duration_seconds",
+            "Time spent in application code within HTTP reqs in seconds",
+          )
+
         @http_redis_duration_seconds =
-          Summary.new("http_redis_duration_seconds", "Time spent in HTTP reqs in redis seconds")
+          Summary.new(
+            "http_redis_duration_seconds",
+            "Time spent in Redis within HTTP reqs redis seconds",
+          )
+
         @http_sql_duration_seconds =
-          Summary.new("http_sql_duration_seconds", "Time spent in HTTP reqs in SQL in seconds")
+          Summary.new("http_sql_duration_seconds", "Time spent in SQL within HTTP reqs in seconds")
+
         @http_net_duration_seconds =
           Summary.new("http_net_duration_seconds", "Time spent in external network requests")
+
         @http_queue_duration_seconds =
           Summary.new(
             "http_queue_duration_seconds",
@@ -274,7 +288,18 @@ def process_web(metric)
         labels[:action] = "other"
       end
 
-      @http_duration_seconds.observe(metric.duration, labels)
+      duration = metric.duration
+
+      @http_duration_seconds.observe(duration, labels)
+
+      if duration
+        application_duration = duration.dup
+        application_duration -= metric.sql_duration if metric.sql_duration
+        application_duration -= metric.redis_duration if metric.redis_duration
+        application_duration -= metric.net_duration if metric.net_duration
+        @http_application_duration_seconds.observe(application_duration, labels)
+      end
+
       @http_sql_duration_seconds.observe(metric.sql_duration, labels)
       @http_redis_duration_seconds.observe(metric.redis_duration, labels)
       @http_net_duration_seconds.observe(metric.net_duration, labels)
@@ -388,6 +413,7 @@ def web_metrics
           @page_views,
           @http_requests,
           @http_duration_seconds,
+          @http_application_duration_seconds,
           @http_redis_duration_seconds,
           @http_sql_duration_seconds,
           @http_net_duration_seconds,
diff --git a/spec/lib/collector_spec.rb b/spec/lib/collector_spec.rb
index 53a5fb7..74387b2 100644
--- a/spec/lib/collector_spec.rb
+++ b/spec/lib/collector_spec.rb
@@ -253,10 +253,10 @@ module DiscoursePrometheus
 
       metrics << InternalMetric::Web.get(
         status_code: 200,
-        duration: 5,
+        duration: 10,
         sql_duration: 1,
-        redis_duration: 3,
-        net_duration: 5,
+        redis_duration: 2,
+        net_duration: 3,
         json: true,
         controller: "list",
         action: "latest",
@@ -265,10 +265,10 @@ module DiscoursePrometheus
 
       metrics << InternalMetric::Web.get(
         status_code: 302,
-        duration: 5,
+        duration: 10,
         sql_duration: 1,
-        redis_duration: 3,
-        net_duration: 5,
+        redis_duration: 2,
+        net_duration: 3,
         controller: "list",
         action: "latest",
         cache: true,
@@ -311,10 +311,11 @@ module DiscoursePrometheus
       }
 
       [
-        ["http_duration_seconds", 5.0],
+        ["http_duration_seconds", 10.0],
+        ["http_application_duration_seconds", 4.0],
         ["http_sql_duration_seconds", 1.0],
-        ["http_redis_duration_seconds", 3.0],
-        ["http_net_duration_seconds", 5.0],
+        ["http_redis_duration_seconds", 2.0],
+        ["http_net_duration_seconds", 3.0],
       ].each { |metric_name, sum| assert_metric.call(metric_name, sum) }
     end
   end