Check HTTPS Certificate is a very simple addon to check expiration date of your HTTPS certificate. Just drop Cert Validity macro to your Confluence page and you will see something similar to:
If your server is running on a non-standard port (other than 443) you can specify port number in your macro settings.
You may use the addon’s REST API to test certificate validity and receive the check results in JSON format.
The macro background color depends on certificate expiration date:
The macro comes in two flavours: for Confluence Macro Browser and for legacy markup support. The latter is to be used with wiki markup macro or SQL-based tables etc.
Normally the macro would check HTTPS server certificate after the page is served by Confluence. You can use ‘sync’ macro parameter to have your page composed with all check results ready, so that you could use Confluence export (to PDF or Word).