[RFC PATCH-SERIES cluster/ha-manager/manager/proxmox 0/7] clamp load imbalance to unit interval

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

# TL;DR 
clamp load imbalance to value between 0 and 1, and display the value as
percentage in HA Status panel of PVE UI. 

# Details
The currently used load imbalance value is given as the so-called coefficient of
variation (CV), a value that may exceed 1. As such, the CV value alone lacks
meaning. A CV value of 0.0 means no imbalance, but what does a value of, say,
1.7 mean?

Relative to the number of nodes in a cluster, it is possible to determine the
upper bound of the CV value [0][1]. By dividing the CV value by its upper
bound, the load imbalance can be represented as a value that varies between 0
and 1. Expressing the CV as a percentage makes the concept of load imbalance
easier to interpret.

# Summary of Changes
This series:
- represents load imbalance as a value between 0 and 1;
- adds a maximum value of 1.0 for load scheduler options; and
- integrates the load imbalance value within the HA status endpoint; 
  this is to provide feedback on the prevailing load imbalance in the PVE UI.

# Refs
[0] https://repositorio.ipbeja.pt/server/api/core/bitstreams/8ed9a444-dbe0-402f-9d2f-90c5bf6e418c/content
[1] https://stats.stackexchange.com/questions/18621/maximum-value-of-coefficient-of-variation-for-bounded-data-set


proxmox:

Dominik Rusovac (2):
  resource-scheduling: clamp imbalance value to unit interval
  resource-scheduling: re-adjust hardcoded imbalance values

 proxmox-resource-scheduling/src/scheduler.rs  | 33 ++++++++++++-------
 .../tests/scheduler.rs                        |  8 ++---
 2 files changed, 25 insertions(+), 16 deletions(-)


pve-manager:

Dominik Rusovac (1):
  ui: from/CRSOptions: add maximum for threshold

 www/manager6/form/CRSOptions.js | 1 +
 1 file changed, 1 insertion(+)


pve-ha-manager:

Dominik Rusovac (3):
  test: re-adjust logged imbalance values
  manager: add load imbalance to status
  api: status: add load imbalance to status

 src/PVE/API2/HA/Status.pm                     |  4 +-
 src/PVE/HA/Manager.pm                         |  1 +
 .../log.expect                                |  4 +-
 .../log.expect                                | 38 +++++++++----------
 .../log.expect                                |  4 +-
 .../log.expect                                | 29 +++++---------
 .../log.expect                                |  2 +-
 .../log.expect                                |  2 +-
 .../log.expect                                |  4 +-
 .../log.expect                                |  4 +-
 .../log.expect                                |  4 +-
 .../log.expect                                | 22 +----------
 12 files changed, 47 insertions(+), 71 deletions(-)


pve-cluster:

Dominik Rusovac (1):
  datacenter config: add maxima for load scheduler options

 src/PVE/DataCenterConfig.pm | 2 ++
 1 file changed, 2 insertions(+)


Summary over all repositories:
  16 files changed, 75 insertions(+), 87 deletions(-)

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