add telemetry (#6926)

* add telemetry

* fix go mod

* add default telemetry server url

* Update README.md

* replace with broker count instead of s3 count

* Update telemetry.pb.go

* github action to deploy

telemetry/prometheus.yml

@@ -0,0 +1,15 @@
+global:
+  scrape_interval: 15s
+  evaluation_interval: 15s
+
+rule_files:
+  # - "first_rules.yml"
+  # - "second_rules.yml"
+
+scrape_configs:
+  - job_name: 'seaweedfs-telemetry'
+    static_configs:
+      - targets: ['telemetry-server:8080']
+    scrape_interval: 30s
+    metrics_path: '/metrics'
+    scrape_timeout: 10s