Update pgbouncer readme

plugins/inputs/pgbouncer/README.md

@@ -1,10 +1,29 @@
-# PgBouncer plugin
+# PgBouncer Input Plugin
 
-This PgBouncer plugin provides metrics for your PgBouncer load balancer.
+The `pgbouncer` plugin provides metrics for your PgBouncer load balancer.
 
-More information about the meaning of these metrics can be found in the [PgBouncer Documentation](https://pgbouncer.github.io/usage.html)
+More information about the meaning of these metrics can be found in the
+[PgBouncer Documentation](https://pgbouncer.github.io/usage.html).
+
+- PgBouncer minimum tested version: 1.5
+
+### Configuration example
+
+```toml
+[[inputs.pgbouncer]]
+  ## specify address via a url matching:
+  ##   postgres://[pqgotest[:password]]@localhost[/dbname]\
+  ##       ?sslmode=[disable|verify-ca|verify-full]
+  ## or a simple string:
+  ##   host=localhost user=pqotest password=... sslmode=... dbname=app_production
+  ##
+  ## All connection parameters are optional.
+  ##
+  address = "host=localhost user=pgbouncer sslmode=disable"
+```
+
+#### `address`
 
-## Configuration
 Specify address via a postgresql connection string:
 
   `host=/run/postgresql port=6432 user=telegraf database=pgbouncer`
@@ -18,8 +37,46 @@ All connection parameters are optional.
 Without the dbname parameter, the driver will default to a database with the same name as the user.
 This dbname is just for instantiating a connection with the server and doesn't restrict the databases we are trying to grab metrics for.
 
-### Configuration example
+### Metrics
+
+- pgbouncer
+  - tags:
+    - db
+    - server
+  - fields:
+    - avg_query_count
+    - avg_query_time
+    - avg_wait_time
+    - avg_xact_count
+    - avg_xact_time
+    - total_query_count
+    - total_query_time
+    - total_received
+    - total_sent
+    - total_wait_time
+    - total_xact_count
+    - total_xact_time
+
++ pgbouncer_pools
+  - tags:
+    - db
+    - pool_mode
+    - server
+    - user
+  - fields:
+    - cl_active
+    - cl_waiting
+    - maxwait
+    - maxwait_us
+    - sv_active
+    - sv_idle
+    - sv_login
+    - sv_tested
+    - sv_used
+
+### Example Output
+
 ```
-[[inputs.pgbouncer]]
-  address = "postgres://telegraf@localhost/pgbouncer"
+pgbouncer,db=pgbouncer,server=host\=debian-buster-postgres\ user\=dbn\ port\=6432\ dbname\=pgbouncer\  avg_query_count=0i,avg_query_time=0i,avg_wait_time=0i,avg_xact_count=0i,avg_xact_time=0i,total_query_count=26i,total_query_time=0i,total_received=0i,total_sent=0i,total_wait_time=0i,total_xact_count=26i,total_xact_time=0i 1581569936000000000
+pgbouncer_pools,db=pgbouncer,pool_mode=statement,server=host\=debian-buster-postgres\ user\=dbn\ port\=6432\ dbname\=pgbouncer\ ,user=pgbouncer cl_active=1i,cl_waiting=0i,maxwait=0i,maxwait_us=0i,sv_active=0i,sv_idle=0i,sv_login=0i,sv_tested=0i,sv_used=0i 1581569936000000000
 ```