> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.vellum.ai/developers/client-sdk/workflows/executions/create-monitoring-event/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.vellum.ai/_mcp/server.

# Create Monitoring Event

POST https://api.vellum.ai/monitoring/v1/events
Content-Type: application/json

Accept an event or list of events and publish them to ClickHouse for analytics processing.

Reference: https://docs.vellum.ai/developers/client-sdk/workflows/executions/create-monitoring-event

## Authentication

- `X-API-KEY` header (required) — API Key authentication via header

## Request

### Body (application/json)

This endpoint expects a CreateWorkflowEventRequest.

- `CreateWorkflowEventRequest`

## Response

### 201

- `count` (integer, required) — Number of events processed
- `success` (boolean, optional, default: true) — Indicates whether the event was published successfully.

## Errors

### 400 Bad Request Error

- `detail` (string, required) — Message informing the user of the error.

### 401 Unauthorized Error

- `detail` (string, required) — Message informing the user of the error.

### 403 Forbidden Error

- `detail` (string, required) — Message informing the user of the error.

### 429 Too Many Requests Error

- `detail` (string, required) — Message informing the user of the error.

## Examples

**Request**

```json
[
  {
    "name": "node.execution.initiated",
    "body": {
      "node_definition": {
        "name": "string",
        "module": [
          "string"
        ],
        "id": "string"
      },
      "inputs": {}
    },
    "id": "string",
    "timestamp": "2024-01-15T09:30:00Z",
    "trace_id": "string",
    "span_id": "string"
  }
]
```

**Response**

```json
{
  "count": 1,
  "success": true
}
```

**SDK Code**

```python
import requests

url = "https://api.vellum.ai/monitoring/v1/events"

payload = [
    {
        "name": "node.execution.initiated",
        "body": {
            "node_definition": {
                "name": "string",
                "module": ["string"],
                "id": "string"
            },
            "inputs": {}
        },
        "id": "string",
        "timestamp": "2024-01-15T09:30:00Z",
        "trace_id": "string",
        "span_id": "string"
    }
]
headers = {
    "X-API-KEY": "<apiKey>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.json())
```

```typescript
import { VellumClient } from "vellum-ai";

const client = new VellumClient({ apiKey: "YOUR_API_KEY", apiVersion: "YOUR_API_VERSION" });
await client.events.create([{
        name: "node.execution.initiated",
        body: {
            nodeDefinition: {
                name: "name",
                module: ["module", "module"],
                id: "id"
            },
            inputs: {
                "inputs": {
                    "key": "value"
                }
            }
        },
        id: "id",
        timestamp: "2024-01-15T09:30:00Z",
        traceId: "trace_id",
        spanId: "span_id"
    }, {
        name: "node.execution.initiated",
        body: {
            nodeDefinition: {
                name: "name",
                module: ["module", "module"],
                id: "id"
            },
            inputs: {
                "inputs": {
                    "key": "value"
                }
            }
        },
        id: "id",
        timestamp: "2024-01-15T09:30:00Z",
        traceId: "trace_id",
        spanId: "span_id"
    }]);

```

```go
package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.vellum.ai/monitoring/v1/events"

	payload := strings.NewReader("[\n  {\n    \"name\": \"node.execution.initiated\",\n    \"body\": {\n      \"node_definition\": {\n        \"name\": \"string\",\n        \"module\": [\n          \"string\"\n        ],\n        \"id\": \"string\"\n      },\n      \"inputs\": {}\n    },\n    \"id\": \"string\",\n    \"timestamp\": \"2024-01-15T09:30:00Z\",\n    \"trace_id\": \"string\",\n    \"span_id\": \"string\"\n  }\n]")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("X-API-KEY", "<apiKey>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(res)
	fmt.Println(string(body))

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://api.vellum.ai/monitoring/v1/events")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["X-API-KEY"] = '<apiKey>'
request["Content-Type"] = 'application/json'
request.body = "[\n  {\n    \"name\": \"node.execution.initiated\",\n    \"body\": {\n      \"node_definition\": {\n        \"name\": \"string\",\n        \"module\": [\n          \"string\"\n        ],\n        \"id\": \"string\"\n      },\n      \"inputs\": {}\n    },\n    \"id\": \"string\",\n    \"timestamp\": \"2024-01-15T09:30:00Z\",\n    \"trace_id\": \"string\",\n    \"span_id\": \"string\"\n  }\n]"

response = http.request(request)
puts response.read_body
```

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.post("https://api.vellum.ai/monitoring/v1/events")
  .header("X-API-KEY", "<apiKey>")
  .header("Content-Type", "application/json")
  .body("[\n  {\n    \"name\": \"node.execution.initiated\",\n    \"body\": {\n      \"node_definition\": {\n        \"name\": \"string\",\n        \"module\": [\n          \"string\"\n        ],\n        \"id\": \"string\"\n      },\n      \"inputs\": {}\n    },\n    \"id\": \"string\",\n    \"timestamp\": \"2024-01-15T09:30:00Z\",\n    \"trace_id\": \"string\",\n    \"span_id\": \"string\"\n  }\n]")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://api.vellum.ai/monitoring/v1/events', [
  'body' => '[
  {
    "name": "node.execution.initiated",
    "body": {
      "node_definition": {
        "name": "string",
        "module": [
          "string"
        ],
        "id": "string"
      },
      "inputs": {}
    },
    "id": "string",
    "timestamp": "2024-01-15T09:30:00Z",
    "trace_id": "string",
    "span_id": "string"
  }
]',
  'headers' => [
    'Content-Type' => 'application/json',
    'X-API-KEY' => '<apiKey>',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("https://api.vellum.ai/monitoring/v1/events");
var request = new RestRequest(Method.POST);
request.AddHeader("X-API-KEY", "<apiKey>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "[\n  {\n    \"name\": \"node.execution.initiated\",\n    \"body\": {\n      \"node_definition\": {\n        \"name\": \"string\",\n        \"module\": [\n          \"string\"\n        ],\n        \"id\": \"string\"\n      },\n      \"inputs\": {}\n    },\n    \"id\": \"string\",\n    \"timestamp\": \"2024-01-15T09:30:00Z\",\n    \"trace_id\": \"string\",\n    \"span_id\": \"string\"\n  }\n]", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = [
  "X-API-KEY": "<apiKey>",
  "Content-Type": "application/json"
]
let parameters = [
  [
    "name": "node.execution.initiated",
    "body": [
      "node_definition": [
        "name": "string",
        "module": ["string"],
        "id": "string"
      ],
      "inputs": []
    ],
    "id": "string",
    "timestamp": "2024-01-15T09:30:00Z",
    "trace_id": "string",
    "span_id": "string"
  ]
] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://api.vellum.ai/monitoring/v1/events")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```