📈 Report traffic dropped metrics to LAPI (#223)

* Initial implementation

* fix

* fixes

* Fixes

* xx

* progress

* xx

* xx

* xx

* fix linter

* Progress

* Fixes

* xx

* xx

* Remove trace logger

* Last fix

* fix lint

* fix lint

* fix lint

---------

Co-authored-by: Max Lerebourg <maxlerebourg@gmail.com>

README.md

@@ -308,12 +308,18 @@ make run
 
 ### Note
 
-**/!\ Cache is shared by all services**
-_This means if an IP is banned, all services which are protected by an instance of the plugin will deny requests from that IP_
-Only one instance of the plugin is _possible_.
+> [!IMPORTANT]  
+> Some of the behaviours and configuration parameters are shared globally across *all* crowdsec middlewares even if you declare different middlewares with different settings. 
+>
+> **Cache is shared by all services**: This means if an IP is banned, all services which are protected by an instance of the plugin will deny requests from that IP
+>
+> If you define different caches for different middlewares, only the first one to be instantiated will be bound to the crowdsec stream.
+>
+> Overall, this middleware is designed in such a way that **only one instance of the plugin is *possible*.** You can have multiple crowdsec middlewares in the same cluster, the key parameters must be aligned (MetricsUpdateIntervalSeconds, CrowdsecMode, CrowdsecAppsecEnabled, etc.)
 
-**/!\ Appsec maximum body limit is defaulted to 10MB**
-_By careful when you upgrade to >1.4.x_
+> [!WARNING]  
+> **Appsec maximum body limit is defaulted to 10MB**
+> *Be careful when you upgrade to >1.4.x*
 
 ### Variables
 
@@ -324,11 +330,16 @@ _By careful when you upgrade to >1.4.x_
 - LogLevel
   - string
   - default: `INFO`, expected values are: `INFO`, `DEBUG`, `ERROR`
-  - Log are written to `stdout` / `stderr` of file if LogFilePath is provided
+  - Log are written to `stdout` / `stderr` or file if LogFilePath is provided
 - LogFilePath
   - string
   - default: ""
   - File Path to write logs, must be writable by Traefik, Log rotation may require a restart of traefik
+- MetricsUpdateIntervalSeconds
+  - int64
+  - default: 600
+  - Interval in seconds between metrics updates to Crowdsec
+  - If set to zero or less, metrics collection is disabled
 - CrowdsecMode
   - string
   - default: `live`, expected values are: `none`, `live`, `stream`, `alone`, `appsec`
@@ -579,6 +590,7 @@ http:
           captchaGracePeriodSeconds: 1800
           captchaHTMLFilePath: /captcha.html
           banHTMLFilePath: /ban.html
+          metricsUpdateIntervalSeconds: 600
 ```
 
 #### Fill variable with value of file