vm_balance_nanny* metrics not initialized

[Carthaca]

Hi, most of the metrics on

openstack-nannies/nannies/vm_load_balance.py

Lines 237 to 256 in e9fd084

	mymetrics.set_metrics('vm_balance_nanny_host_size_bytes', 'des:vm_balance_nanny_host_size_bytes', ['nodename'])
	mymetrics.set_metrics('vm_balance_nanny_host_size_consume_all_vm_bytes',
	'des:vm_balance_nanny_host_size_consume_all_vm_bytes', ['nodename'])
	mymetrics.set_metrics('vm_balance_nanny_host_size_consume_big_vm_bytes',
	'des:vm_balance_nanny_host_size_consume_big_vm_bytes', ['nodename'])
	mymetrics.set_metrics('vm_balance_nanny_suggestion_bytes', 'des:vm_balance_nanny_suggestion_bytes',
	['source_node', 'target_node', 'big_vm_name', 'big_vm_size'])
	mymetrics.set_metrics('vm_balance_nanny_manual_suggestion_bytes', 'des:vm_balance_nanny_manual_suggestion_bytes',
	['source_node', 'target_node', 'big_vm_name', 'big_vm_size'])
	mymetrics.set_metrics('vm_balance_building_block_consume_all_vm_bytes',
	'des:vm_balance_building_block_consume_all_vm_bytes',
	['Building_block'])
	mymetrics.set_metrics('vm_balance_building_block_consume_big_vm_bytes',
	'des:vm_balance_building_block_consume_big_vm_bytes',
	['Building_block'])
	mymetrics.set_metrics('vm_balance_building_block_total_size_bytes',
	'des:vm_balance_building_block_total_siz_bytes',
	['Building_block'])
	mymetrics.set_metrics('vm_balance_error_count','des:vm_balance_error_count',['error_type'])
	mymetrics.set_metrics('vm_balance_too_full_building_block','des:vm_balance_too_full_building_block', ['consolidated_needed'])

only are present if the nanny was working on something or if an error occurred.

E.g. if big_vm_to_move_list is empty

openstack-nannies/nannies/vm_load_balance.py

Line 162 in e9fd084

if len(big_vm_to_move_list) > 0:

, vm_balance_error_count will not be present, but I would expect it to be there with value '0'

[Carthaca]

As a workaround I disabled the alerting on absent metrics sapcc/helm-charts@3ce8217 and sapcc/helm-charts@c68c4c1