Here we have already done with the configuration part but for proper functioning of it need some guidance.
- we are assuming 50K messages per second, so please suggest what we need to tune in server.conf &
other conf if required.
Thanks in advance
Hey @shivamtiwari18
I must say thats a lot and out of my knowledge base for sure 
A while back this was posted here and here
There are other members that have very large environment/s im sure they will jump in for ya… Not sure how you setup your cluster but normally Opensearch/elasticsearch nodes would be separate from Graylog/MongoDb nodes. I do about 30-40 Gb a day, started off watching Elasticsearch/Graylog using metric’s tools (i.e,Cerebro, Grafana & Zabbix) incase something bad happens and adjust settings as needed. Thats all what I know 
can you provide your graylog config file .
- set up a Loadbalancer. Without you will be lost
- separate your Graylog from Elastic/Opensearch
- know how to configure heap for Graylog and Elastic/Opensearch. Graylog should have about 80% of available RAM, Elastic/Opensearch 50% (rest for Caching by OS).
- for 10-15k msg/sec I use 3 GL nodes with 16 Cores and 32GB ram. As it should scale linear you can do the math
- Depending on how long you want to keep your data you will need a lot of storage. Make sure to know how to handle shards and calculate the necessary heap.
- adjust the number of processors in the graylog config for processing. Here you will need a big increase. Also for input and output some slight increases might be necessary.