Currently, BaseServiceV2 automatically generates environment variables based on the following piece of code:

Notice that the name of the variable ends with optionName.toUpperCase(). This creates a situation where environment variables look like:

MY_SERVICE_NAME__MYVARIABLENAME

However, we prefer to have variables like:

MY_SERVICE_NAME__MY_VARIABLE_NAME

I think the correct way to handle this is to turn the variable name into snake case, then make it upper case. There might be some issues later with the piece of code where we actually load these environment variables. If that does end up being a problem, we'll figure it out when we run into it:

Once this is done, you will also have to update some places where the old variable style is used, for instance:

And:

https://github.com/ethereum-optimism/optimism/blob/779709f275e8f69bba9941042d91affce4c71d4c/packages/message-relayer/.env.example#L1-L12

The only two services that use BaseServiceV2 are the message-relayer and the replica-healthcheck. You should be able to find all places where the old environment variable style is used by searching for MESSAGE_RELAYER and REPLICA_HEALTHCHECK in the codebase.