https://github.com/eclipse/che/issues/19303

Hello,
Please, the current linkchecker script that validates current Eclipse Che PRs get stuck on an error caused by a website denial of service attack protection, causing a delay in the merging process. When this link test isn't finished successfully, we can merge a PR.

The problem is, that the test fails on a link that is active and OK, but a "Max retries exceeded" counter of the affected page blocks access to that page (caused by several connection attempts in a short time), and linckcecker threatens it as a broken link.

To work around this issue, we set the ignorewarnings=url-rate-limited parameter in linkcheckerrc configuration, which should make the linkchecer validation immune against this error:

{{# Ignore the comma-separated list of warnings.
ignorewarnings=url-rate-limited}}

But it seems it doesn't work as we expected and the script ends with a failure that blocks a merge.

Example

{{URL `https://github.com/che-incubator/chectl#user-content-chectl-serverdeploy'
Parent URL http://localhost:4000/che-7/administration-guide/configuring-openshift-oauth/, line 725, col 1
Real URL https://github.com/che-incubator/chectl#user-content-chectl-serverdeploy
Result Error: ConnectionError: HTTPSConnectionPool(host='github.com', port=443): Max retries exceeded with url: /che-incubator/chectl (Caused by NewConnectionError('<urllib3.connection.HTTPSConnection object at 0x7f57cadda6a0>: Failed to establish a new ...}}

Can you help us to tune up the linkchecker config so that our process of adding new documentation could be as fast as we can deliver?
Thank you.