Merge branch '15397-remove-obsolete-apis'

refs #15397

Arvados-DCO-1.1-Signed-off-by: Tom Clegg <tom@curii.com>

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@@@ -32,20 -32,18 +32,32 @@@ h2(#main). development mai
  
  "previous: Upgrading to 2.7.1":#v2_7_1
  
 +h3. Debian 10, Ubuntu 18.04, and CentOS are no longer supported
 +
 +Arvados 3.0 no longer supports some of the older distributions supported by Arvados 2.7: Debian 10 "buster," Ubuntu 18.04 "bionic," and CentOS 7 and 8. If you are running Arvados on any of these distributions, you must first upgrade to a supported distribution before you upgrade to Arvados 3.0.
 +
 +Arvados 2.7 supports Debian 11 "bullseye" and Ubuntu 20.04 "focal." If you are running Debian or Ubuntu, You can upgrade to one of those releases, then proceed to upgrade Arvados to 3.0.
 +
 +If you are running CentOS, Arvados 2.7 supports Red Hat Enterprise Linux 8, AlmaLinux 8, and Rocky Linux 8. Please plan a migration to one of these related distributions. Then you can upgrade to Arvados 3.0.
 +
 +h3. RVM is no longer supported
 +
 +Some Arvados packages, most notably the Rails API server package @arvados-api-server@, would check whether RVM is installed on the system, and invoke Ruby commands through it if so. Arvados 3.0 no longer specially supports RVM. Instead, Arvados 3.0 supports all the different versions of Ruby that are packaged in our supported distributions, mitigating the need to support separate Ruby installations. Package scripts run plain @ruby@ and @gem@ commands and expect they come from a supported version.
 +
 +If you have a custom install that requires a different version of Ruby than the one included with your distribution, you must configure your system to ensure package scripts find that version of @ruby@ before any others. For example, you might do this on Debian-based distributions by customizing apt's @DPkg::Path@ setting.
 +
+ h3. Configuration entries have been removed or renamed
+ 
+ The following configuration keys have been renamed or removed.  Renamed keys will still be loaded if they appear with their old names, but you should update your @/etc/arvados/config.yml@ file to avoid warnings when services start up.
+ * @Containers.JobsAPI.Enable@ has been removed
+ * @Mail.EmailFrom@ has been removed
+ * @Mail.IssueReporterEmailFrom@ has been removed
+ * @Mail.IssueReporterEmailTo@ has been removed
+ * @Mail.MailchimpAPIKey@ has been removed
+ * @Mail.MailchimpListID@ has been removed
+ * @Mail.SendUserSetupNotificationEmail@ has moved to @Users.SendUserSetupNotificationEmail@
+ * @Mail.SupportEmailAddress@ has moved to @Users.SupportEmailAddress@
+ 
  h3. S3 volume IAMRole configuration entry has been removed
  
  The @Volumes.*.DriverParameters.IAMRole@ configuration entry for S3 volumes has been removed. You should remove it from your @/etc/arvados/config.yml@ file to avoid warnings when services start up. As before, if @AccessKeyID@ and @SecretAccessKey@ are blank, keepstore will retrieve IAM role credentials from instance metadata. Previously, documentation indicated that keepstore would refuse to use the IAM credentials if @IAMRole@ was specified and did not match the instance metadata, but that check has not been working for some time.

diff --cc sdk/R/README.md
Simple merge