@elver the following is the content of the email;
The mLab team has chosen to discontinue this add-on. The mLab MongoDB add-on will be removed from all Heroku apps on November 10, 2020 . We advise you to remove the mLab MongoDB add-on yourself before September 1, 2020 via the Dashboard or the CLI.
Next Steps
You may wish to consider an alternative add-on from the Heroku Elements marketplace. As of the date of this email, ObjectRocket makes available an add-on on the Heroku Elements Marketplace that you may wish to consider. For customers considering remaining with mLab/Atlas, information can be found here.
Please note that the ObjectRocket for MongoDB add-on is not provided by Salesforce or Heroku. Salesforce makes no warranties or guarantees regarding this add-on, and it is defined as a “Non-SFDC Application” in the Master Subscription Agreement found at https://hello.heroku.com/e/36622/company-msa-jsp/lv2qdz/961660285?h=AW6T3SXCo9_yIUarc_zSqZ0GfY-idBwV3oqtMJFbI7c. You should undertake your own evaluation of this add-on and determine whether it is suitable for your specific business needs. Please contact ObjectRocket directly to find out more information.