Use DeleteAnomalyDetector with an AWS SDK or CLI

    /// <summary>
    /// Delete a single metric anomaly detector.
    /// </summary>
    /// <param name="anomalyDetector">The anomaly detector to delete.</param>
    /// <returns>True if successful.</returns>
    public async Task<bool> DeleteAnomalyDetector(SingleMetricAnomalyDetector anomalyDetector)
    {
        var deleteAnomalyDetectorResponse = await _amazonCloudWatch.DeleteAnomalyDetectorAsync(
            new DeleteAnomalyDetectorRequest()
            {
                SingleMetricAnomalyDetector = anomalyDetector
            });

        return deleteAnomalyDetectorResponse.HttpStatusCode == HttpStatusCode.OK;
    }

To delete a specified anomaly detection model

The following delete-anomaly-detector example deletes an anomaly detector model in the specified account.

aws cloudwatch delete-anomaly-detector \
    --namespace AWS/Logs \
    --metric-name IncomingBytes \
    --stat SampleCount

This command produces no output.

For more information, see Deleting an anomaly detection model in the Amazon CloudWatch User Guide.

    /**
     * Deletes an Anomaly Detector.
     *
     * @param fileName the name of the file containing the Anomaly Detector configuration
     * @return a CompletableFuture that represents the asynchronous deletion of the Anomaly Detector
     */
    public CompletableFuture<DeleteAnomalyDetectorResponse> deleteAnomalyDetectorAsync(String fileName) {
        CompletableFuture<JsonNode> readFileFuture = CompletableFuture.supplyAsync(() -> {
            try {
                JsonParser parser = new JsonFactory().createParser(new File(fileName));
                return new ObjectMapper().readTree(parser); // Return the root node
            } catch (IOException e) {
                throw new RuntimeException("Failed to read or parse the file", e);
            }
        });

        return readFileFuture.thenCompose(rootNode -> {
            String customMetricNamespace = rootNode.findValue("customMetricNamespace").asText();
            String customMetricName = rootNode.findValue("customMetricName").asText();

            SingleMetricAnomalyDetector singleMetricAnomalyDetector = SingleMetricAnomalyDetector.builder()
                .metricName(customMetricName)
                .namespace(customMetricNamespace)
                .stat("Maximum")
                .build();

            DeleteAnomalyDetectorRequest request = DeleteAnomalyDetectorRequest.builder()
                .singleMetricAnomalyDetector(singleMetricAnomalyDetector)
                .build();

            return getAsyncClient().deleteAnomalyDetector(request);
        }).whenComplete((result, exception) -> {
            if (exception != null) {
                throw new RuntimeException("Failed to delete the Anomaly Detector", exception);
            } else {
                logger.info("Successfully deleted the Anomaly Detector.");
            }
        });
    }

suspend fun deleteAnomalyDetector(fileName: String) {
    // Read values from the JSON file.
    val parser = JsonFactory().createParser(File(fileName))
    val rootNode = ObjectMapper().readTree<JsonNode>(parser)
    val customMetricNamespace = rootNode.findValue("customMetricNamespace").asText()
    val customMetricName = rootNode.findValue("customMetricName").asText()

    val singleMetricAnomalyDetectorVal =
        SingleMetricAnomalyDetector {
            metricName = customMetricName
            namespace = customMetricNamespace
            stat = "Maximum"
        }

    val request =
        DeleteAnomalyDetectorRequest {
            singleMetricAnomalyDetector = singleMetricAnomalyDetectorVal
        }

    CloudWatchClient { region = "us-east-1" }.use { cwClient ->
        cwClient.deleteAnomalyDetector(request)
        println("Successfully deleted the Anomaly Detector.")
    }
}