Merge branch 'docker-update-infra-docs' into 'master'

Update docs about use docker-compose-infra.yml file

See merge request noc/noc!5472

docker/Readme.infra.md

@@ -9,6 +9,13 @@ A: These are several services that collect and visualize
    * Sentry: http://<ip>:9000
    * VictoriaMetrics: http://<ip>:8880
 
+Q: how can i start using this?
+
+A: You need run 
+   ```
+   docker-compose -f docker-compose-infra.yml up -d  
+   ```
+
 Q: Sentry not work after first run. 
 
 A: You need run 
@@ -18,3 +25,24 @@ A: You need run
    Setup admin user and password.
 
    Go to https://0.0.0.0:9000 to login in Sentry
+
+Q: Can I use the file to monitor other NOC installations?
+
+A: Yes. Edit *./var/docker-vmagent/etc/prometheus.yml*:
+   ```
+     - job_name: 'prod_consul'
+    consul_sd_configs:
+      - server: 'consul:8500'
+
+   ```
+   to 
+   ```
+     - job_name: 'prod_consul'
+    consul_sd_configs:
+      - server: '<consul bootstrap IP NOC installations>:8500'
+
+   ```
+   and restart container *vmagent*
+   ```
+   docker-compose -f docker-compose-infra.yml restart vmagent
+   ```