Duplicate Metric and Negative Value for http.server.active_requests in io.opentelemetry.servlet-3.0

[xiepuhuan]

Describe the bug

Duplicate Metric and Negative Value for http.server.active_requests in io.opentelemetry.servlet-3.0

Steps to reproduce

1. Create a SpringBoot Web example project with the following controller code:

   package example
   
   import org.springframework.web.bind.annotation.GetMapping;
   import org.springframework.web.bind.annotation.RestController;
   import org.springframework.web.context.request.async.DeferredResult;
   
   @RestController
   public class Server {
   
     @GetMapping("/hello")
     public DeferredResult<String> hello() {
       DeferredResult<String> deferredResult = new DeferredResult<>();
       deferredResult.onTimeout(() -> System.out.println("Request timeout"));
       deferredResult.onCompletion(() -> System.out.println("Request complete"));
   
       new Thread(() -> {
         try {
           Thread.sleep(10000);
           deferredResult.setResult("Hello World!");
         } catch (InterruptedException e) {
           deferredResult.setErrorResult(e);
         }
       }).start();
       return deferredResult;
     }
   }

2. Build the project and generate the example.jar file.

3. Execute the following command to run the project with OpenTelemetry instrumentation:

   java -javaagent:/path/opentelemetry-javaagent.jar -Dotel.traces.exporter=none -Dotel.logs.exporter=none -Dotel.metrics.exporter=logging-otlp -Dotel.instrumentation.http.server.emit-experimental-telemetry=true -jar example.jar

4. Send single HTTP requests to the /hello endpoint.

5. Observe the metric logs

Expected behavior

I would like to report an issue regarding the http.server.active_requests metric, which is present only in a single ScopeMetrics and is expected to have values greater than or equal to 0.

Actual behavior

{
  "resource": {
    "attributes": [
      {
        "key": "host.arch",
        "value": {
          "stringValue": "aarch64"
        }
      },
      {
        "key": "host.name",
        "value": {
          "stringValue": "xiepuhuan.local"
        }
      },
      {
        "key": "os.description",
        "value": {
          "stringValue": "Mac OS X 14.0"
        }
      },
      {
        "key": "os.type",
        "value": {
          "stringValue": "darwin"
        }
      },
      {
        "key": "process.executable.path",
        "value": {
          "stringValue": "/Users/xiepuhuan/Library/Java/JavaVirtualMachines/azul-1.8.0_362/Contents/Home/jre/bin/java"
        }
      },
      {
        "key": "process.pid",
        "value": {
          "intValue": "81312"
        }
      },
      {
        "key": "process.runtime.description",
        "value": {
          "stringValue": "Azul Systems, Inc. OpenJDK 64-Bit Server VM 25.362-b09"
        }
      },
      {
        "key": "process.runtime.name",
        "value": {
          "stringValue": "OpenJDK Runtime Environment"
        }
      },
      {
        "key": "process.runtime.version",
        "value": {
          "stringValue": "1.8.0_362-b09"
        }
      },
      {
        "key": "service.instance.id",
        "value": {
          "stringValue": "fd4a20ee-3cec-4298-be87-1e832b2ac499"
        }
      },
      {
        "key": "service.name",
        "value": {
          "stringValue": "zeus-server-test-two"
        }
      },
      {
        "key": "telemetry.distro.name",
        "value": {
          "stringValue": "opentelemetry-java-instrumentation"
        }
      },
      {
        "key": "telemetry.distro.version",
        "value": {
          "stringValue": "2.5.0"
        }
      },
      {
        "key": "telemetry.sdk.language",
        "value": {
          "stringValue": "java"
        }
      },
      {
        "key": "telemetry.sdk.name",
        "value": {
          "stringValue": "opentelemetry"
        }
      },
      {
        "key": "telemetry.sdk.version",
        "value": {
          "stringValue": "1.39.0"
        }
      }
    ]
  },
  "scopeMetrics": [
    {
      "scope": {
        "name": "io.opentelemetry.tomcat-7.0",
        "version": "2.5.0-alpha",
        "attributes": []
      },
      "metrics": [
        {
          "name": "http.server.active_requests",
          "description": "Number of active HTTP server requests.",
          "unit": "{requests}",
          "sum": {
            "dataPoints": [
              {
                "startTimeUnixNano": "1718776803088000000",
                "timeUnixNano": "1718776863097000000",
                "asInt": "1",
                "exemplars": [
                  {
                    "timeUnixNano": "1718776818524000000",
                    "asInt": "1",
                    "spanId": "984b6f71dd6996b1",
                    "traceId": "14357b5a17a604b878a4c9785596c9ab",
                    "filteredAttributes": [
                      {
                        "key": "client.address",
                        "value": {
                          "stringValue": "127.0.0.1"
                        }
                      },
                      {
                        "key": "server.address",
                        "value": {
                          "stringValue": "127.0.0.1"
                        }
                      },
                      {
                        "key": "server.port",
                        "value": {
                          "intValue": "8080"
                        }
                      },
                      {
                        "key": "url.path",
                        "value": {
                          "stringValue": "/hello"
                        }
                      },
                      {
                        "key": "user_agent.original",
                        "value": {
                          "stringValue": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36"
                        }
                      }
                    ]
                  }
                ],
                "attributes": [
                  {
                    "key": "http.request.method",
                    "value": {
                      "stringValue": "GET"
                    }
                  },
                  {
                    "key": "url.scheme",
                    "value": {
                      "stringValue": "http"
                    }
                  }
                ]
              }
            ],
            "aggregationTemporality": 2
          }
        }
      ]
    },
    {
      "scope": {
        "name": "io.opentelemetry.servlet-3.0",
        "version": "2.5.0-alpha",
        "attributes": []
      },
      "metrics": [
        {
          "name": "http.server.request.duration",
          "description": "Duration of HTTP server requests.",
          "unit": "s",
          "histogram": {
            "dataPoints": [
              {
                "startTimeUnixNano": "1718776803088000000",
                "timeUnixNano": "1718776863097000000",
                "count": "1",
                "sum": 10.250294625,
                "min": 10.250294625,
                "max": 10.250294625,
                "bucketCounts": [
                  "0",
                  "0",
                  "0",
                  "0",
                  "0",
                  "0",
                  "0",
                  "0",
                  "0",
                  "0",
                  "0",
                  "0",
                  "0",
                  "0",
                  "1"
                ],
                "explicitBounds": [
                  0.005,
                  0.01,
                  0.025,
                  0.05,
                  0.075,
                  0.1,
                  0.25,
                  0.5,
                  0.75,
                  1.0,
                  2.5,
                  5.0,
                  7.5,
                  10.0
                ],
                "exemplars": [
                  {
                    "timeUnixNano": "1718776828774000000",
                    "asDouble": 10.250294625,
                    "spanId": "984b6f71dd6996b1",
                    "traceId": "14357b5a17a604b878a4c9785596c9ab",
                    "filteredAttributes": [
                      {
                        "key": "client.address",
                        "value": {
                          "stringValue": "127.0.0.1"
                        }
                      },
                      {
                        "key": "http.response.body.size",
                        "value": {
                          "intValue": "12"
                        }
                      },
                      {
                        "key": "network.peer.address",
                        "value": {
                          "stringValue": "127.0.0.1"
                        }
                      },
                      {
                        "key": "network.peer.port",
                        "value": {
                          "intValue": "53572"
                        }
                      },
                      {
                        "key": "server.address",
                        "value": {
                          "stringValue": "127.0.0.1"
                        }
                      },
                      {
                        "key": "server.port",
                        "value": {
                          "intValue": "8080"
                        }
                      },
                      {
                        "key": "url.path",
                        "value": {
                          "stringValue": "/hello"
                        }
                      },
                      {
                        "key": "user_agent.original",
                        "value": {
                          "stringValue": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36"
                        }
                      }
                    ]
                  }
                ],
                "attributes": [
                  {
                    "key": "http.request.method",
                    "value": {
                      "stringValue": "GET"
                    }
                  },
                  {
                    "key": "http.response.status_code",
                    "value": {
                      "intValue": "200"
                    }
                  },
                  {
                    "key": "http.route",
                    "value": {
                      "stringValue": "/hello"
                    }
                  },
                  {
                    "key": "network.protocol.version",
                    "value": {
                      "stringValue": "1.1"
                    }
                  },
                  {
                    "key": "url.scheme",
                    "value": {
                      "stringValue": "http"
                    }
                  }
                ]
              }
            ],
            "aggregationTemporality": 2
          }
        },
        {
          "name": "http.server.response.size",
          "description": "Size of HTTP server response bodies.",
          "unit": "By",
          "histogram": {
            "dataPoints": [
              {
                "startTimeUnixNano": "1718776803088000000",
                "timeUnixNano": "1718776863097000000",
                "count": "1",
                "sum": 12.0,
                "min": 12.0,
                "max": 12.0,
                "bucketCounts": [
                  "0",
                  "0",
                  "0",
                  "1",
                  "0",
                  "0",
                  "0",
                  "0",
                  "0",
                  "0",
                  "0",
                  "0",
                  "0",
                  "0",
                  "0",
                  "0"
                ],
                "explicitBounds": [
                  0.0,
                  5.0,
                  10.0,
                  25.0,
                  50.0,
                  75.0,
                  100.0,
                  250.0,
                  500.0,
                  750.0,
                  1000.0,
                  2500.0,
                  5000.0,
                  7500.0,
                  10000.0
                ],
                "exemplars": [
                  {
                    "timeUnixNano": "1718776828773000000",
                    "asDouble": 12.0,
                    "spanId": "984b6f71dd6996b1",
                    "traceId": "14357b5a17a604b878a4c9785596c9ab",
                    "filteredAttributes": [
                      {
                        "key": "client.address",
                        "value": {
                          "stringValue": "127.0.0.1"
                        }
                      },
                      {
                        "key": "http.response.body.size",
                        "value": {
                          "intValue": "12"
                        }
                      },
                      {
                        "key": "network.peer.address",
                        "value": {
                          "stringValue": "127.0.0.1"
                        }
                      },
                      {
                        "key": "network.peer.port",
                        "value": {
                          "intValue": "53572"
                        }
                      },
                      {
                        "key": "server.address",
                        "value": {
                          "stringValue": "127.0.0.1"
                        }
                      },
                      {
                        "key": "server.port",
                        "value": {
                          "intValue": "8080"
                        }
                      },
                      {
                        "key": "url.path",
                        "value": {
                          "stringValue": "/hello"
                        }
                      },
                      {
                        "key": "user_agent.original",
                        "value": {
                          "stringValue": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36"
                        }
                      }
                    ]
                  }
                ],
                "attributes": [
                  {
                    "key": "http.request.method",
                    "value": {
                      "stringValue": "GET"
                    }
                  },
                  {
                    "key": "http.response.status_code",
                    "value": {
                      "intValue": "200"
                    }
                  },
                  {
                    "key": "http.route",
                    "value": {
                      "stringValue": "/hello"
                    }
                  },
                  {
                    "key": "network.protocol.version",
                    "value": {
                      "stringValue": "1.1"
                    }
                  },
                  {
                    "key": "url.scheme",
                    "value": {
                      "stringValue": "http"
                    }
                  }
                ]
              }
            ],
            "aggregationTemporality": 2
          }
        },
        {
          "name": "http.server.active_requests",
          "description": "Number of active HTTP server requests.",
          "unit": "{requests}",
          "sum": {
            "dataPoints": [
              {
                "startTimeUnixNano": "1718776803088000000",
                "timeUnixNano": "1718776863097000000",
                "asInt": "-1",
                "exemplars": [
                  {
                    "timeUnixNano": "1718776828773000000",
                    "asInt": "-1",
                    "spanId": "984b6f71dd6996b1",
                    "traceId": "14357b5a17a604b878a4c9785596c9ab",
                    "filteredAttributes": [
                      {
                        "key": "client.address",
                        "value": {
                          "stringValue": "127.0.0.1"
                        }
                      },
                      {
                        "key": "server.address",
                        "value": {
                          "stringValue": "127.0.0.1"
                        }
                      },
                      {
                        "key": "server.port",
                        "value": {
                          "intValue": "8080"
                        }
                      },
                      {
                        "key": "url.path",
                        "value": {
                          "stringValue": "/hello"
                        }
                      },
                      {
                        "key": "user_agent.original",
                        "value": {
                          "stringValue": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36"
                        }
                      }
                    ]
                  }
                ],
                "attributes": [
                  {
                    "key": "http.request.method",
                    "value": {
                      "stringValue": "GET"
                    }
                  },
                  {
                    "key": "url.scheme",
                    "value": {
                      "stringValue": "http"
                    }
                  }
                ]
              }
            ],
            "aggregationTemporality": 2
          }
        }
      ]
    }
  ],
  "schemaUrl": "https://opentelemetry.io/schemas/1.24.0"
}

Javaagent or library instrumentation version

v2.5.0

Environment

JDK: Azul Systems, Inc. OpenJDK 64-Bit Server VM 25.362-b09
OS: Mac OS X 14.0
SpringBoot: 2.7.14

Additional context

No response