[ARVADOS] updated: 2.1.0-2404-g6932f4b8d

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Summary of changes:
 doc/admin/upgrading.html.textile.liquid | 4 ++++
 1 file changed, 4 insertions(+)

       via  6932f4b8d78f5067035831ae8a4ea8efdf2fd6b2 (commit)
      from  e826bf5dcaf591b42d42f80cea6c63c04e3db8dd (commit)

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commit 6932f4b8d78f5067035831ae8a4ea8efdf2fd6b2
Author: Tom Clegg <tom at curii.com>
Date:   Tue May 10 10:00:27 2022 -0400

    19095: Add upgrade note about singularity version.
    
    Arvados-DCO-1.1-Signed-off-by: Tom Clegg <tom at curii.com>

diff --git a/doc/admin/upgrading.html.textile.liquid b/doc/admin/upgrading.html.textile.liquid
index 226c8667d..f686eec8b 100644
--- a/doc/admin/upgrading.html.textile.liquid
+++ b/doc/admin/upgrading.html.textile.liquid
@@ -32,6 +32,10 @@ h2(#main). development main (as of 2022-04-08)
 
 "previous: Upgrading to 2.4.0":#v2_4_0
 
+h3. Now recommending Singularity 3.9.9
+
+The compute image builder now installs Singularity 3.9.9 instead of 3.7.4. The newer version includes a bugfix that should resolve "intermittent loopback device errors":https://dev.arvados.org/issues/18489 when running containers.
+
 h2(#v2_4_0). v2.4.0 (2022-04-08)
 
 "previous: Upgrading to 2.3.1":#v2_3_1

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