Can any one tell me how I will encrypt my credentials in meltano.yml file

Hi @ashish_soni! meltano.yml is a plain text file that is normally not encrypted. If you need to store secrets, you can do that in the environment or the system database. https://docs.meltano.com/guide/configuration/#configuration-layers

can we do by key vault?

Not currently. What sort of support for key vault would you expect to see?

we already have vault in environment ,so can we pull secrets from the vault?

Hmm how would normally pull secrets from the vault, say, in a Python script?