Significance of "GOAWAY received"

[gilday]

I'm using the HttpClientGitHubConnector to make HTTP/2 requests to the GitHub API. Occasionally, a request fails with "GOAWAY received". I'm not sure when GitHub sends a GOAWAY frame.

• Is this another way that GitHub communicates secondary rate limits?
• Is this a GitHub outage?
• Is this GitHub telling the app that it has kept its HTTP/2 connection open for too long?

Has anyone else identified a pattern in when GitHub sends a GOAWAY? Would it be appropriate to add retries into the HttpClientGitHubConnector to handle GOAWAY?