Merge branch '19620-remove-old-s3-driver'

closes #19620

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

diff --cc doc/admin/upgrading.html.textile.liquid
index 3527a5c93fae633918d95f16127b357c9929a3e3,026931ed08ee8ccb8cf81f74363ffc6677d60306..02ded1fc425d714567800d0b45361ff82a93df43
--- 1/doc/admin/upgrading.html.textile.liquid
--- 2/doc/admin/upgrading.html.textile.liquid
+++ b/doc/admin/upgrading.html.textile.liquid
@@@ -28,20 -28,14 +28,24 @@@ TODO: extract this information based o
  <div class="releasenotes">
  </notextile>
  
- h2(#main). development main (as of 2023-04-17)
 -h2(#main). development main (as of 2023-04-06)
++h2(#main). development main (as of 2023-04-18)
  
 -"previous: Upgrading to 2.6.0":#v2_6_0
 +"previous: Upgrading to 2.6.1":#v2_6_1
  
+ h3. UseAWSS3v2Driver option removed
+ 
+ The old "v1" S3 driver for keepstore has been removed. The new "v2" implementation, which has been the default since Arvados 2.5.0, is always used. The @Volumes.*.DriverParameters.UseAWSS3v2Driver@ configuration key is no longer recognized. If your config file uses it, remove it to avoid warning messages at startup.
+ 
 +h2(#v2_6_1). v2.6.1 (2023-04-17)
 +
 +"previous: Upgrading to 2.6.0":#v2_6_0
 +
 +h3. Performance improvement for permission row de-duplication migration
 +
 +The migration which de-duplicates permission links has been optimized.  We recommend upgrading from 2.5.0 directly to 2.6.1 in order to avoid the slow permission de-deplication migration in 2.6.0.
 +
 +You should still plan for the arvados-api-server package upgrade to take longer than usual due to the database schema update changing the integer id column in each table from 32-bit to 64-bit.
 +
  h2(#v2_6_0). v2.6.0 (2023-04-06)
  
  "previous: Upgrading to 2.5.0":#v2_5_0