Multipass exporter added to exporters.md

[Abuelodelanada]

A Prometheus exporter for Multipass that exposes metrics about your Multipass instances added.

Metrics exposed

# HELP multipass_instances_total Total number of Multipass instances
# TYPE multipass_instances_total gauge
multipass_instances_total 8

# HELP multipass_instances_running Total number of Multipass running instances
# TYPE multipass_instances_running gauge
multipass_instances_running 6

# HELP multipass_instances_stopped Total number of Multipass stopped instances
# TYPE multipass_instances_stopped gauge
multipass_instances_stopped 1

# HELP multipass_instances_deleted Total number of Multipass deleted instances
# TYPE multipass_instances_deleted gauge
multipass_instances_deleted 1

# HELP multipass_instances_suspended Total number of Multipass suspended instances
# TYPE multipass_instances_suspended gauge
multipass_instances_suspended 0

# HELP multipass_instance_memory_bytes Memory usage of Multipass instances in bytes
# TYPE multipass_instance_memory_bytes gauge
multipass_instance_memory_bytes{name="charm-dev-36",release="Ubuntu 24.04.3 LTS"} 3.388157952e+09
multipass_instance_memory_bytes{name="coslite",release="Ubuntu 22.04.2 LTS"} 2.986962944e+09
multipass_instance_memory_bytes{name="edp",release="Ubuntu 23.10"} 1.530298368e+09

# HELP multipass_error Error collecting metrics from Multipass
# TYPE multipass_error gauge
multipass_error 0