[PATCH pve-ha-manager v3 5/6] api: status: add load imbalance to status

[Dominik Rusovac <d.rusovac@proxmox.com>]

This is a very basic measure to enable users to detect the prevailing
load imbalance in the UI, which atm reveals nothing about the latter.

Load imbalance should appear in status if CRS mode is not basic and
auto-rebalance is enabled.

imo, enabling users to track how the load imbalance changed over time
(using RRD graphs, for example) should be considered, in the long run.

Signed-off-by: Dominik Rusovac <d.rusovac@proxmox.com>
---

Notes:
    changes since v2:
    * correct extra_status handling
    * check definedness of imbalance

 src/PVE/API2/HA/Status.pm | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/PVE/API2/HA/Status.pm b/src/PVE/API2/HA/Status.pm
index 4894f3b..feb1419 100644
--- a/src/PVE/API2/HA/Status.pm
+++ b/src/PVE/API2/HA/Status.pm
@@ -199,8 +199,15 @@ __PACKAGE__->register_method({
             }
             my $datacenter_config = eval { cfs_read_file('datacenter.cfg') } // {};
             if (my $crs = $datacenter_config->{crs}) {
-                $extra_status .= " - $crs->{ha} load CRS"
-                    if $crs->{ha} && $crs->{ha} ne 'basic';
+                my $mode = $crs->{ha};
+
+                if ($mode && $mode ne 'basic') {
+                    $extra_status .= " - $mode load CRS ";
+
+                    my $imbalance = $status->{imbalance};
+                    $extra_status .= sprintf("(load imbalance: %.2f", 100 * $imbalance) . "%)"
+                        if $crs->{'ha-auto-rebalance'} && defined($imbalance);
+                }
             }
             my $time_str = localtime($status->{timestamp});
             my $status_text = "$master ($status_str, $time_str)$extra_status";
-- 
2.47.3