Posts hidden by community flags

I received three messages from system user account that my posts were flagged as spam and that the community feels it is an advertisement, something that is overly promotional in nature instead of being useful or relevant to the topic as expected.

Can someone review these three posts and let me know why they are spam?

  1. How to connect to a Service upstream that is behind Cloudflare?
  2. Key Authentication is not working
  3. Kong build fails