service.name

MUST be the same for all instances of horizontally scaled services. If the value was not specified, SDKs MUST fallback to unknown_service: concatenated with the process executable name, e.g. unknown_service:bash. If the process executable name is not available, the value MUST be set to unknown_service. The process executable name is the name of the process executable, the same value as described by the process.executable.name resource attribute.