attempt to deploy to an existing deployment with a non-matching app mode.

Couldn't authenticate to publishing server.

Couldn't connect to Connect.

Server failed to deploy the bundle.

Could not find deployment to update.

HTTP request to publishing server timed out.

Server responded with 403 forbidden.

HTTP 5xx code from publishing server.

Vanity URL already in use.

SSEHandler emits an event for every log message.

We use Operation and Phase to construct the event Type.

Phase indicates which part of an Operation we are performing.