Add a monitoring collector

[arifintahu]

Add support to retrieve metrics from DigitalOcean monitoring agent.

# HELP digitalocean_monitoring_bandwidth Droplet's bandwidth metrics in megabits per second
# TYPE digitalocean_monitoring_bandwidth gauge
digitalocean_monitoring_bandwidth{direction="inbound",id="331890131",interface="private",name="monitoring",region="sgp1"} 3.5e-06
digitalocean_monitoring_bandwidth{direction="inbound",id="331890131",interface="public",name="monitoring",region="sgp1"} 0.08891845
digitalocean_monitoring_bandwidth{direction="inbound",id="335103642",interface="private",name="relayer",region="sgp1"} 4.028776978417266e-06
digitalocean_monitoring_bandwidth{direction="inbound",id="335103642",interface="public",name="relayer",region="sgp1"} 0.48691528057553957
digitalocean_monitoring_bandwidth{direction="outbound",id="331890131",interface="private",name="monitoring",region="sgp1"} 0
digitalocean_monitoring_bandwidth{direction="outbound",id="331890131",interface="public",name="monitoring",region="sgp1"} 0.0102715
digitalocean_monitoring_bandwidth{direction="outbound",id="335103642",interface="private",name="relayer",region="sgp1"} 0
digitalocean_monitoring_bandwidth{direction="outbound",id="335103642",interface="public",name="relayer",region="sgp1"} 0.006332489208633094
# HELP digitalocean_monitoring_cpu Droplet's CPU metrics in seconds
# TYPE digitalocean_monitoring_cpu gauge
digitalocean_monitoring_cpu{id="331890131",mode="idle",name="monitoring",region="sgp1"} 5.13550726e+06
digitalocean_monitoring_cpu{id="331890131",mode="iowait",name="monitoring",region="sgp1"} 2804.8
digitalocean_monitoring_cpu{id="331890131",mode="irq",name="monitoring",region="sgp1"} 0
digitalocean_monitoring_cpu{id="331890131",mode="nice",name="monitoring",region="sgp1"} 576.9
digitalocean_monitoring_cpu{id="331890131",mode="softirq",name="monitoring",region="sgp1"} 362.29999999999995
digitalocean_monitoring_cpu{id="331890131",mode="steal",name="monitoring",region="sgp1"} 3786.93
digitalocean_monitoring_cpu{id="331890131",mode="system",name="monitoring",region="sgp1"} 7947.02
digitalocean_monitoring_cpu{id="331890131",mode="user",name="monitoring",region="sgp1"} 27535.48
digitalocean_monitoring_cpu{id="335103642",mode="idle",name="relayer",region="sgp1"} 1.3431176400000001e+06
digitalocean_monitoring_cpu{id="335103642",mode="iowait",name="relayer",region="sgp1"} 311.35
digitalocean_monitoring_cpu{id="335103642",mode="irq",name="relayer",region="sgp1"} 0
digitalocean_monitoring_cpu{id="335103642",mode="nice",name="relayer",region="sgp1"} 279.19
digitalocean_monitoring_cpu{id="335103642",mode="softirq",name="relayer",region="sgp1"} 280.32
digitalocean_monitoring_cpu{id="335103642",mode="steal",name="relayer",region="sgp1"} 3024.91
digitalocean_monitoring_cpu{id="335103642",mode="system",name="relayer",region="sgp1"} 3412.04
digitalocean_monitoring_cpu{id="335103642",mode="user",name="relayer",region="sgp1"} 15711.099999999999
# HELP digitalocean_monitoring_filesystem_free Droplet's filesystem free metrics in bytes
# TYPE digitalocean_monitoring_filesystem_free gauge
digitalocean_monitoring_filesystem_free{device="/dev/vda1",fstype="ext4",id="331890131",mountpoint="/",name="monitoring",region="sgp1"} 4.8162512896e+10
digitalocean_monitoring_filesystem_free{device="/dev/vda1",fstype="ext4",id="335103642",mountpoint="/",name="relayer",region="sgp1"} 4.7189798912e+10
# HELP digitalocean_monitoring_filesystem_size Droplet's filesystem size metrics in bytes
# TYPE digitalocean_monitoring_filesystem_size gauge
digitalocean_monitoring_filesystem_size{device="/dev/vda1",fstype="ext4",id="331890131",mountpoint="/",name="monitoring",region="sgp1"} 6.2254768128e+10
digitalocean_monitoring_filesystem_size{device="/dev/vda1",fstype="ext4",id="335103642",mountpoint="/",name="relayer",region="sgp1"} 6.2254768128e+10
# HELP digitalocean_monitoring_memory_available Droplet's available memory metrics in bytes
# TYPE digitalocean_monitoring_memory_available gauge
digitalocean_monitoring_memory_available{id="331890131",name="monitoring",region="sgp1"} 1.401225216e+09
digitalocean_monitoring_memory_available{id="335103642",name="relayer",region="sgp1"} 1.463861248e+09
# HELP digitalocean_monitoring_memory_cached Droplet's cached memory metrics in bytes
# TYPE digitalocean_monitoring_memory_cached gauge
digitalocean_monitoring_memory_cached{id="331890131",name="monitoring",region="sgp1"} 1.342271488e+09
digitalocean_monitoring_memory_cached{id="335103642",name="relayer",region="sgp1"} 1.065623552e+09
# HELP digitalocean_monitoring_memory_free Droplet's free memory metrics in bytes
# TYPE digitalocean_monitoring_memory_free gauge
digitalocean_monitoring_memory_free{id="331890131",name="monitoring",region="sgp1"} 1.37990144e+08
digitalocean_monitoring_memory_free{id="335103642",name="relayer",region="sgp1"} 3.16162048e+08
# HELP digitalocean_monitoring_memory_total Droplet's total memory metrics in bytes
# TYPE digitalocean_monitoring_memory_total gauge
digitalocean_monitoring_memory_total{id="331890131",name="monitoring",region="sgp1"} 2.079367168e+09
digitalocean_monitoring_memory_total{id="335103642",name="relayer",region="sgp1"} 2.079367168e+09

[DazWilkin]

Arifin -- Have you tried to contact @metalmatze out-of-band for a review of this PR?

[metalmatze]

Oh. This ping is already helpful.
I seem to have somehow missed or forgotten this. I'll take a look.

[metalmatze]

Some metric names should be updated to follow Prometheus naming conventions. That'd be good. Otherwise it looks great!

[metalmatze]

Going with the other Prometheus metrics in the process Exporter this should probably have a _seconds_total suffix.

[metalmatze]

Should probably be bytes_total suffix

[metalmatze]

_bytes suffix would be great.

[metalmatze]

_bytes suffix would be great.