set custom namespace

Author: Vlasis-Perdikidis

lambdas/upsert-letter/package.json

@@ -1,5 +1,6 @@
 {
   "dependencies": {
+    "@aws-sdk/client-cloudwatch": "^3.972.0",
     "@aws-sdk/client-dynamodb": "^3.858.0",
     "@aws-sdk/lib-dynamodb": "^3.858.0",
     "@internal/datastore": "*",

lambdas/upsert-letter/src/handler/upsert-handler.ts

@@ -20,8 +20,14 @@ import {
 } from "@nhsdigital/nhs-notify-event-schemas-letter-rendering";
 import z from "zod";
 import { Unit, metricScope } from "aws-embedded-metrics";
+import {
+  CloudWatchClient,
+  PutMetricDataCommand,
+} from "@aws-sdk/client-dynamodb";
 import { Deps } from "../config/deps";
 
+const cwClient = new CloudWatchClient({ region: "eu-west-2" });
+
 type SupplierSpec = { supplierId: string; specId: string };
 type PreparedEvents = LetterRequestPreparedEventV2 | LetterRequestPreparedEvent;
 type UpsertOperation = {
@@ -158,6 +164,7 @@ export default function createUpsertLetterHandler(deps: Deps): SQSHandler {
     return async (event: SQSEvent) => {
       console.log("The SQSEvent:", event);
       const batchItemFailures: SQSBatchItemFailure[] = [];
+      metrics.setNamespace("vlasis_upsertLetter");
 
       const tasks = event.Records.map(async (record) => {
         try {
@@ -181,6 +188,7 @@ export default function createUpsertLetterHandler(deps: Deps): SQSHandler {
             OperationType: operation.name,
           });
           metrics.setProperty("operation", operation.name);
+
           metrics.putMetric("MessagesProcessed", 1, Unit.Count);
         } catch (error) {
           deps.logger.error(