The logging.googleapis.com/severity field is no longer mentioned in https://cloud.google.com/logging/docs/agent/configuration#special-fields docs, and when viewed in Google Cloud Logging, severity is missing (and inferred from stderr as ERROR).

For this reason, we add the severity field as well. The logging.googleapis.com/severity field is still mentioned in https://cloud.google.com/stackdriver/docs/solutions/agents/ops-agent/configuration#special-fields, which is why we keep it.

An example configuration on that page suggests rewriting the field (https://cloud.google.com/stackdriver/docs/solutions/agents/ops-agent/configuration#example_configuration_2), however, this seemed cumbersome to do in our deployment on big.cdr.dev and sending both fields seems like a good compromise.