I am getting errors say that “An error occurred: ...LogGroup - /aws/lambda/... already exists”, why and how can I fix?
You should skip log group creation for the mentioned function or for all functions. By default this plugin creates log groups of monitored functions to subscribe them. But if the log group was already created without this plugin (by invocation or manually), log group creation should be skipped. See https://docs.thundra.io/docs/serverless-plugin for more details.