Integration with Sentry - Request Payload

Hi, we have integrated Sentry with our application using webhooks with the help of Sentry doc on webhooks. Recently, we have noticed a request payload coming into our system from Sentry which is not listed in this webhook documentation. Can anyone help to let me know in which scenario the below payload is triggered from Sentry(steps) and any documentation link referring to it? Thank you.

{
  "id": "2776956037",
  "project": "test-mobile",
  "project_name": "test-app",
  "project_slug": "test-mobile",
  "logger": null,
  "level": "fatal",
  "culprit": "",
  "message": "",
  "url": "https://sentry.io/organizations/test-ve/issues/2776956037/?referrer=webhooks_plugin",
  "triggering_rules": [
    "test Mobile alerts"
  ],
  "event": {
    "event_id": "1264cbbd38184c7c913a67c853e07aa9",
    "level": "fatal",
    "version": "7",
    "type": "error",
    "fingerprint": [
      "{{ default }}"
    ],
    "culprit": "",
    "logger": "",
    "platform": "cocoa",
    "timestamp": 1643047212.038279,
    "received": 1643047212.48639,
    "release": "com.test.obj@2.1.2+1",
    "dist": "1",
    "environment": "production",
    "user": {
      "id": "CB1CCC9E-B1BA-4780-849E-018AD7586C92",
      "ip_address": "174.241.252.51",
      "geo": {
        "country_code": "US",
        "city": "Fremont",
        "region": "United States"
      }
    },
    "contexts": {
      "app": {
        "app_start_time": "2022-01-24T17:59:30Z",
        "device_app_hash": "a74caeb2d3efeaa5a047fce8d80bdab394c50080",
        "build_type": "app store",
        "app_identifier": "com.test.obj",
        "app_name": "test",
        "app_version": "2.1.2",
        "app_build": "1",
        "app_id": "9742919B-73A7-356F-8FEB-C90DB73CA634",
        "type": "app"
      },
      "device": {
        "family": "iOS",
        "model": "iPhone13,3",
        "model_id": "D53pAP",
        "memory_size": 6013534208,
        "usable_memory": 3919314944,
        "storage_size": 127881465856,
        "boot_time": "2022-01-22T10:37:32Z",
        "timezone": "PST",
        "type": "device"
      },
      "os": {
        "name": "iOS",
        "version": "15.2.1",
        "build": "19C63",
        "kernel_version": "Darwin Kernel Version 21.2.0: Sun Nov 28 20:43:38 PST 2021; root:xnu-8019.62.2~1/RELEASE_ARM64_T8101",
        "rooted": false,
        "type": "os"
      }
    },
    "exception": {
      "values": [
        {
          "type": "OutOfMemory",
          "value": "The OS most likely terminated your app because it overused RAM.",
          "mechanism": {
            "type": "out_of_memory",
            "handled": false
          }
        }
      ]
    },
    "tags": [
      [
        "app.device",
        "a74caeb2d3efeaa5a047fce8d80bdab394c50080"
      ],
      [
        "device",
        "iPhone13,3"
      ],
      [
        "device.family",
        "iOS"
      ],
      [
        "environment",
        "production"
      ],
      [
        "handled",
        "no"
      ],
      [
        "level",
        "fatal"
      ],
      [
        "mechanism",
        "out_of_memory"
      ],
      [
        "os",
        "iOS 15.2.1"
      ],
      [
        "os.name",
        "iOS"
      ],
      [
        "os.rooted",
        "no"
      ],
      [
        "sentry:dist",
        "1"
      ],
      [
        "sentry:release",
        "com.test.obj@2.1.2+1"
      ],
      [
        "sentry:user",
        "id:CB1CCC9E-B1BA-4780-849E-018AD7586C92"
      ]
    ],
    "sdk": {
      "name": "sentry.cocoa",
      "version": "7.5.1"
    },
    "ingest_path": [
      {
        "version": "21.12.0",
        "public_key": "XE7QiyuNlja9PZ7I9qJlwQotzecWrUIN91BAO7Q5R38"
      }
    ],
    "key_id": "1863176",
    "project": 6037820,
    "grouping_config": {
      "enhancements": "eJybzDRxY3J-bm5-npWRgaGlroGxrpHxBABcYgcZ",
      "id": "newstyle:2019-10-29"
    },
    "_metrics": {
      "bytes.ingested.event": 1281,
      "bytes.stored.event": 2515
    },
    "_ref": 6037820,
    "_ref_version": 2,
    "hashes": [
      "b0aed2e3fbe64f5fb23a49eccce4fabd"
    ],
    "metadata": {
      "display_title_with_tree_label": true,
      "type": "OutOfMemory",
      "value": "The OS most likely terminated your app because it overused RAM."
    },
    "nodestore_insert": 1643047218.970467,
    "title": "OutOfMemory: The OS most likely terminated your app because it overused RAM.",
    "id": "1264cbbd38184c7c913a67c853e07aa9"
  }
}