Drupal core version 6 has reached end of life, and is no longer a community supported release on Drupal.org. This means that new releases of Drupal core and contributed projects are no longer able to distribute releases and the associated update information through Drupal.org.
What this means for you:
Drupal 6 will no longer be supported by the community at large.
The community at large will no longer be creating new projects, fixing bugs in existing projects, writing documentation, etc. around Drupal 6.
There will be no more core commits on Drupal 6.x to the official tree.
The security team will no longer provide support or Security Advisories for Drupal 6 All Drupal 6 releases on project pages will be flagged as not supported.
At some point in the future update status may stop working for Drupal 6 sites.