feat: add message retry and failure metrics tracking

Added metrics tracking for:
- message_retries_total: Incremented when message retry is attempted
- message_failures_total: Incremented when max retries reached or encryption fails

Note: messages_queued metric is not applicable as this implementation
sends messages directly without an explicit queue system.

src/Socket/messages-recv.ts

@@ -4,7 +4,7 @@ import { randomBytes } from 'crypto'
 import Long from 'long'
 import { proto } from '../../WAProto/index.js'
 import { DEFAULT_CACHE_TTLS, KEY_BUNDLE_TYPE, MIN_PREKEY_COUNT } from '../Defaults'
-import { metrics, recordMessageReceived, recordHistorySyncMessages } from '../Utils/prometheus-metrics.js'
+import { metrics, recordMessageReceived, recordHistorySyncMessages, recordMessageRetry, recordMessageFailure } from '../Utils/prometheus-metrics.js'
 import type {
 	GroupParticipant,
 	MessageReceiptType,
@@ -409,11 +409,13 @@ export const makeMessagesRecvSocket = (config: SocketConfig) => {
 			if (messageRetryManager.hasExceededMaxRetries(msgId)) {
 				logger.debug({ msgId }, 'reached retry limit with new retry manager, clearing')
 				messageRetryManager.markRetryFailed(msgId)
+				recordMessageFailure('retry', 'max_retries_reached')
 				return
 			}
 
 			// Increment retry count using new system
 			const retryCount = messageRetryManager.incrementRetryCount(msgId)
+			recordMessageRetry('retry')
 
 			// Use the new retry count for the rest of the logic
 			const key = `${msgId}:${msgKey?.participant}`
@@ -425,11 +427,13 @@ export const makeMessagesRecvSocket = (config: SocketConfig) => {
 			if (retryCount >= maxMsgRetryCount) {
 				logger.debug({ retryCount, msgId }, 'reached retry limit, clearing')
 				await msgRetryCache.del(key)
+				recordMessageFailure('retry', 'max_retries_reached')
 				return
 			}
 
 			retryCount += 1
 			await msgRetryCache.set(key, retryCount)
+			recordMessageRetry('retry')
 		}
 
 		const key = `${msgId}:${msgKey?.participant}`

src/Socket/messages-send.ts

@@ -596,6 +596,7 @@ export const makeMessagesSocket = (config: SocketConfig) => {
 		const nodes = (await Promise.all(encryptionPromises)).filter(node => node !== null) as BinaryNode[]
 
 		if (recipientJids.length > 0 && nodes.length === 0) {
+			recordMessageFailure('send', 'encryption_failed')
 			throw new Boom('All encryptions failed', { statusCode: 500 })
 		}