docs: updated readme

README.md

@@ -2,14 +2,30 @@
 
 This project is a Kubernetes custom controller to create users on dbsync's Postgres. This controller defines a new CRD DbSyncPort on Kubernetes and when the new users enable the External Dbsync, the Demiter will generate a manifest with the kind DbSyncPort and the controller will be watching for creating a new user on Postgres.
 
+> [!IMPORTANT]  
+> The metrics collector uses the `pg_stat_statements` extension enabled on Postgres. To enable that extension follow the steps bellow.
+
+- set pg_stat_statements at `shared_preload_libraries` on postgresql.conf
+  ```
+  shared_preload_libraries = 'pg_stat_statements'
+  ```
+- create the extension on postgres
+  ```
+  CREATE EXTENSION IF NOT EXISTS pg_stat_statements;
+  ```
+
 ## Environment
 
-| Key            | Value                                 |
-| -------------- | ------------------------------------- |
-| ADDR           | 0.0.0.0:5000                          |
-| DB_URL_MAINNET | postgres://user:password@host:post/db |
-| DB_URL_PREPROD | postgres://user:password@host:post/db |
-| DB_URL_PREVIEW | postgres://user:password@host:post/db |
+| Key                    | Value                                 |
+| ---------------------- | ------------------------------------- |
+| ADDR                   | 0.0.0.0:5000                          |
+| DB_URL_MAINNET         | postgres://user:password@host:post/db |
+| DB_URL_PREPROD         | postgres://user:password@host:post/db |
+| DB_URL_PREVIEW         | postgres://user:password@host:post/db |
+| METRICS_DELAY          | 30                                    |
+| DCU_PER_SECOND_MAINNET | 10                                    |
+| DCU_PER_SECOND_PREPROD | 10                                    |
+| DCU_PER_SECOND_PREVIEW | 10                                    |
 
 ## Commands