The --restricted-migration option was added to allow evacuating nodes
in the middle of a hypervisor upgrade, where the only migrations you
were sure to be save were those off the evacuated node. In the mean
time, migration tags have been added for precisely the purpose of
hypervisor upgrades. So mention in the man pages that those usually
are the better option.

Signed-off-by: Klaus Aehlig <aeh...@google.com>
---
 man/hbal.rst | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/man/hbal.rst b/man/hbal.rst
index 0bf50f6..00b1b74 100644
--- a/man/hbal.rst
+++ b/man/hbal.rst
@@ -341,7 +341,8 @@ The options that can be passed to the program are as 
follows:
   option, the only migrations that hbal will do are migrations of
   instances off a drained node. This can be useful if during a reinstall
   of the base operating system migration is only possible from the old
-  OS to the new OS.
+  OS to the new OS. Note, however, that usually the use of migration
+  tags is the better choice.
 
 \--select-instances=*instances*
   This parameter marks the given instances (as a comma-separated list)
-- 
2.2.0.rc0.207.ga3a616c

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