curl --request PUT \
  --url https://{tenant}.chronosphere.io/api/v1/data/panel_annotations/{id} \
  --header 'API-Token: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "labels": {},
  "starts_at": "2023-11-07T05:31:56Z",
  "title": "<string>"
}
'

package main

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

func main() {

	url := "https://{tenant}.chronosphere.io/api/v1/data/panel_annotations/{id}"

	payload := strings.NewReader("{\n  \"labels\": {},\n  \"starts_at\": \"2023-11-07T05:31:56Z\",\n  \"title\": \"<string>\"\n}")

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

	req.Header.Add("API-Token", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

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

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

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.put("https://{tenant}.chronosphere.io/api/v1/data/panel_annotations/{id}")
  .header("API-Token", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"labels\": {},\n  \"starts_at\": \"2023-11-07T05:31:56Z\",\n  \"title\": \"<string>\"\n}")
  .asString();

const options = {
  method: 'PUT',
  headers: {'API-Token': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({labels: {}, starts_at: '2023-11-07T05:31:56Z', title: '<string>'})
};

fetch('https://{tenant}.chronosphere.io/api/v1/data/panel_annotations/{id}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://{tenant}.chronosphere.io/api/v1/data/panel_annotations/{id}"

payload = {
    "labels": {},
    "starts_at": "2023-11-07T05:31:56Z",
    "title": "<string>"
}
headers = {
    "API-Token": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

{
  "created_by": "<string>",
  "id": "<string>",
  "labels": {},
  "starts_at": "2023-11-07T05:31:56Z",
  "target_reference": "<string>",
  "title": "<string>",
  "type": "DASHBOARD"
}

{
  "code": 123,
  "details": [
    {
      "@type": "<string>"
    }
  ],
  "message": "<string>"
}