added doc and updated values

charts/pg-operator-db/DOC.md

@@ -1,10 +1,22 @@
 Backup - 
-Restore
-Extension Installation
-PGbouncer
-Patroni Template - 
-LLVM (for JIT Compilation)
-DR
-Switch Over
-User and DB creation
-Monitoring
+
+Restore -
+
+Extension Installation- To use an extension, install it. Run the CREATE EXTENSION command on the PostgreSQL node where you want the extension to be available e.g. CREATE EXTENSION hstore SCHEMA demo; https://docs.percona.com/postgresql/13/extensions.html
+
+PGbouncer- We are exposing the cluster through PgBouncer, which is enabled by default. It acts as DB proxy. It can be disabled by setting proxy.pgBouncer.replicas to 0. https://docs.percona.com/percona-operator-for-postgresql/2.0/expose.html
+
+Patroni Template - It is a template for configuring a highly available PostgreSQL cluster. https://docs.percona.com/postgresql/16/solutions/high-availability.html
+
+LLVM (for JIT Compilation)- Percona Operator is based on CrunchyData’s PostgreSQL Operator which includes LLVM (for JIT compilation). JIT compilation is the process of turning some form of interpreted program evaluation into a native program, and doing so at run time. For example, instead of using general-purpose code that can evaluate arbitrary SQL expressions to evaluate a particular SQL predicate like WHERE a.col = 3, it is possible to generate a function that is specific to that expression and can be natively executed by the CPU, yielding a speedup. https://www.postgresql.org/docs/current/jit-reason.html
+
+DR - To achieve a production grade PostgreSQL disaster recovery solution, we need something that can take full or incremental database backups from a running instance, and restore from those backups at any point in time. Percona Distribution for PostgreSQL is supplied with pgBackRest: a reliable, open-source backup and recovery solution for PostgreSQL. 
+
+pgBackRest supports remote repository hosting and can even use cloud-based services like AWS S3, Google Cloud Services Cloud Storage, Azure Blob Storage for saving backup files.
+https://docs.percona.com/postgresql/14/solutions/backup-recovery.html
+
+Switch Over- In Percona Operator, the primary instance election can be controlled by the patroni.switchover section of the Custom Resource manifest. It allows to enable switchover targeting a specific PostgreSQL instance as the new primary, or just running a failover if PostgreSQL cluster has entered a bad state. https://docs.percona.com/percona-operator-for-postgresql/2.0/change-primary.html
+
+User and DB creation- We can create the users and DB by providing values in the 'users' section in values.yaml. https://docs.percona.com/percona-operator-for-postgresql/2.0/users.html
+
+Monitoring- 

charts/pg-operator-db/values.yaml

@@ -2,10 +2,48 @@ pg-operator:
   enabled: true
 pg-db:
   enabled: true
+  users:
+    - name: rhino
+      databases:
+        - zoo
+      options: "NOSUPERUSER"
+      password:
+        type: ASCII
+      secretName: "rhino-credentials"
+  instances:
+  - name: instance1
+    replicas: 2
+    dataVolumeClaimSpec:
+      # storageClassName: default
+      accessModes:
+      - ReadWriteOnce
+      resources:
+        requests:
+          storage: 1Gi
   pmm:
     enabled: false
   proxy:
     pgBouncer:
+      replicas: 2
       config:
         global:
           client_tls_sslmode: prefer
+  patroni:
+    # Some values of the Liveness/Readiness probes of the patroni container are calulated using syncPeriodSeconds by the following formulas:
+    # - timeoutSeconds:   syncPeriodSeconds / 2;
+    # - periodSeconds:    syncPeriodSeconds;
+    # - failureThreshold: leaderLeaseDurationSeconds / syncPeriodSeconds.
+    syncPeriodSeconds: 10
+    leaderLeaseDurationSeconds: 30
+    dynamicConfiguration:
+      postgresql:
+        parameters:
+          max_parallel_workers: 2
+          max_worker_processes: 2
+          shared_buffers: 1GB
+          work_mem: 2MB
+        pg_hba:
+        - host    all mytest 123.123.123.123/32 reject
+    switchover:
+      enabled: "true"
+      targetInstance: ""