perf(cmpp): instrument inbound flow and unbatch submit worker

api/src/send-chain/gateway-events.controller.ts

@@ -1,4 +1,4 @@
-import { BadRequestException, Body, Controller, Post } from '@nestjs/common';
+import { BadRequestException, Body, Controller, Optional, Post } from '@nestjs/common';
 import { ApiTags } from '@nestjs/swagger';
 import {
   GatewayInboundAuthDto,
@@ -19,6 +19,7 @@ import { GatewayDownstreamConnectionEventDto } from '../sms-config/sms-config.co
 import { SmsConfigService } from '../sms-config/sms-config.service';
 import { ProtocolLogsService, type ProtocolLogInput } from '../protocol-logs/protocol-logs.service';
 import { SecurityDetectionService } from '../security-detection/security-detection.service';
+import { MetricsService } from '../metrics/metrics.service';
 
 @ApiTags('gateway-events')
 @Controller('gateway/events')
@@ -28,6 +29,7 @@ export class GatewayEventsController {
     private readonly smsConfig: SmsConfigService,
     private readonly protocolLogs: ProtocolLogsService,
     private readonly security: SecurityDetectionService,
+    @Optional() private readonly metrics?: MetricsService,
   ) {}
 
   @Post('submit-result')
@@ -139,6 +141,9 @@ export class GatewayEventsController {
     direction: ProtocolLogInput['direction'] = 'channel_to_platform',
   ) {
     const startedAt = Date.now();
+    const inboundMetricStartedAt = eventType === 'submit' && direction === 'client_to_platform'
+      ? this.metrics?.beginCmppInboundStage()
+      : undefined;
     const value = body as Record<string, unknown>;
     const common: Omit<ProtocolLogInput, 'status'> = {
       protocol: 'cmpp',
@@ -173,6 +178,9 @@ export class GatewayEventsController {
         status: 'success',
         durationMs: Date.now() - startedAt,
       });
+      if (inboundMetricStartedAt != null) {
+        this.metrics?.finishCmppInboundStage(inboundMetricStartedAt, 'total', 'success');
+      }
       return result;
     } catch (error) {
       this.protocolLogs.record({
@@ -181,6 +189,9 @@ export class GatewayEventsController {
         durationMs: Date.now() - startedAt,
         detail: { error: error instanceof Error ? error.message : 'unknown error' },
       });
+      if (inboundMetricStartedAt != null) {
+        this.metrics?.finishCmppInboundStage(inboundMetricStartedAt, 'total', 'error');
+      }
       throw error;
     }
   }