Added info on kakfa engine and grant setup

content/en/altinity-kb-integrations/altinity-kb-kafka/altinity-kb-kafka-grants.md

@@ -0,0 +1,66 @@
+# Grants and the Kafka Engine   
+
+There are some issues that are useful to know about when working with the Kafka engine with respect to Grants
+
+## Default user, out of the box
+
+The default user, as set up on a stock installation, has no issues with respect to access to both Kafka Engine tables or `system.kakfa_consumers`.
+
+## Creating users with access to Kafka engine tables and `system.kafka_consumers`
+
+There is sometimes a need to create a database user for the purpose of accessing various system tables, albeit one without admin privileges and one that is read-only.
+
+In this situation, the grants given aren't what one would expect in that grants would be given on a table-granular level, but at a database-wide level.
+
+The request: there needs to be a "dba" user with read-only privileges that has the ability to read `system.kafka_consumers`.
+
+Granting `SELECT` to the user specifying `system.kafka_consumers` and any Kafka engine tables, per table, will allow access to those tables and `system.kafka_cosumers` without any errors, but the resultset of selecting the rows in `system.kafka_consumers` will be empty.
+
+The only way for this to work is the following:
+
+```
+CREATE ROLE 'dbsupport';
+GRANT SELECT on *.* to dbsupport_admin;
+CREATE USER dba INDENTIFIED WITH sha256_password BY 'secure-password'
+GRANT dbsupport TO dba
+```
+
+This user should then be able to query `system.kafka_consumers`:
+
+example:
+
+```
+
+clickhouse-client -u dba
+
+clickhouse01 :) select * from system.kafka_consumers FORMAT Vertical;
+
+SELECT *
+FROM system.kafka_consumers
+FORMAT Vertical
+
+Query id: 218de3e6-d12f-43f0-95ed-122cd39be7c1
+
+Row 1:
+──────
+database:                   default
+table:                      readings_queue
+consumer_id:                ClickHouse-clickhouse01-default-readings_queue-68867c5b-92b6-4fa8-994d-ea4834fedc1c
+assignments.topic:          ['readings','readings','readings','readings','readings','readings']
+assignments.partition_id:   [0,1,2,3,4,5]
+assignments.current_offset: [-1001,-1001,-1001,-1001,-1001,-1001]
+exceptions.time:            []
+exceptions.text:            []
+last_poll_time:             2025-03-06 20:33:21
+num_messages_read:          6
+last_commit_time:           2025-03-05 21:20:36
+num_commits:                1
+last_rebalance_time:        2025-03-06 11:49:46
+num_rebalance_revocations:  3
+num_rebalance_assignments:  4
+is_currently_used:          1
+last_used:                  2025-03-06 20:33:21.187460
+rdkafka_stat:               
+
+1 row in set. Elapsed: 0.004 sec. 
+```