feat: add grafana cloud collector switch for container loadtest

deploy/container/README.md

@@ -162,6 +162,18 @@ npm run container:logs -- otelcol
 
 Collector 日志会输出 traces / metrics / logs。接 Rider、Jaeger、Tempo、Prometheus、Grafana 或托管平台时，另建独立 Collector 配置，不直接改生产 systemd 或 Nginx 模板。
 
+容器内需要临时转发到 Grafana Cloud 时，切换 Collector 配置并从当前 shell 传入 Grafana Cloud 凭据；真实 token 不写入仓库文件：
+
+```powershell
+$env:GENARRATIVE_CONTAINER_OTELCOL_CONFIG="./otelcol.grafana.yaml"
+$env:GRAFANA_CLOUD_OTLP_ENDPOINT="https://..."
+$env:GRAFANA_CLOUD_BASIC_AUTH_HEADER="Basic ..."
+npm run container:up
+npm run container:logs -- otelcol
+```
+
+`deploy/container/otelcol.grafana.yaml` 会同时保留本地 debug exporter，并通过 `otlphttp/grafana` 把 traces / metrics / logs 发到 Grafana Cloud。
+
 ## 隔离边界
 
 - 不改生产 systemd 单元。

deploy/container/docker-compose.loadtest.yml

@@ -104,8 +104,12 @@ services:
     command: ["--config=/etc/otelcol/config.yaml"]
     cpus: "0.25"
     mem_limit: 128m
+    environment:
+      GRAFANA_CLOUD_OTLP_ENDPOINT: ${GRAFANA_CLOUD_OTLP_ENDPOINT:-}
+      GRAFANA_CLOUD_BASIC_AUTH_HEADER: ${GRAFANA_CLOUD_BASIC_AUTH_HEADER:-}
+      HOSTNAME: ${HOSTNAME:-genarrative-container-loadtest}
     volumes:
-      - ./otelcol.yaml:/etc/otelcol/config.yaml:ro
+      - ${GENARRATIVE_CONTAINER_OTELCOL_CONFIG:-./otelcol.yaml}:/etc/otelcol/config.yaml:ro
     ports:
       - "${GENARRATIVE_CONTAINER_OTLP_GRPC_PORT:-4317}:4317"
       - "${GENARRATIVE_CONTAINER_OTLP_HTTP_PORT:-4318}:4318"

deploy/container/otelcol.grafana.yaml

@@ -0,0 +1,36 @@
+receivers:
+  otlp:
+    protocols:
+      grpc:
+        endpoint: 0.0.0.0:4317
+      http:
+        endpoint: 0.0.0.0:4318
+
+processors:
+  batch:
+    timeout: 5s
+    send_batch_size: 512
+    send_batch_max_size: 1024
+
+exporters:
+  debug:
+    verbosity: basic
+  otlp_http/grafana:
+    endpoint: ${env:GRAFANA_CLOUD_OTLP_ENDPOINT}
+    headers:
+      Authorization: ${env:GRAFANA_CLOUD_BASIC_AUTH_HEADER}
+
+service:
+  pipelines:
+    traces:
+      receivers: [otlp]
+      processors: [batch]
+      exporters: [debug, otlp_http/grafana]
+    metrics:
+      receivers: [otlp]
+      processors: [batch]
+      exporters: [debug, otlp_http/grafana]
+    logs:
+      receivers: [otlp]
+      processors: [batch]
+      exporters: [debug, otlp_http/grafana]