Add sys/class/net parsing from procfs and expose its metrics (#851)

* add sys/class/net parsing from procfs and expose its metrics

Signed-off-by: Jan Klat <jenik@klatys.cz>

* change code to use int pointers per procfs change, move netclass to separate collector, change metric naming

Signed-off-by: Jan Klat <jenik@klatys.cz>

* bump year in licence, remove redundant newline, correct fixtures

Signed-off-by: Jan Klat <jenik@klatys.cz>

* fix style

Signed-off-by: Jan Klat <jenik@klatys.cz>

* change carrier changes to counter type

Signed-off-by: Jan Klat <jenik@klatys.cz>

* fix e2e output

Signed-off-by: Jan Klat <jenik@klatys.cz>

* add fixtures

Signed-off-by: Jan Klat <jenik@klatys.cz>

* update vendor, use fixtures correctly

Signed-off-by: Jan Klat <jenik@klatys.cz>

* change fixtures (device in /sys/class/net should be symlinked)

Signed-off-by: Jan Klat <jenik@klatys.cz>

* correct fixtures for 64k page, updated readme

Signed-off-by: Jan Klat <jenik@klatys.cz>

collector/fixtures/e2e-64k-page-output.txt

@@ -1669,6 +1669,51 @@ node_netstat_Udp_NoPorts 120
 # HELP node_netstat_Udp_OutDatagrams Statistic UdpOutDatagrams.
 # TYPE node_netstat_Udp_OutDatagrams untyped
 node_netstat_Udp_OutDatagrams 53028
+# HELP node_network_address_assign_type address_assign_type value of /sys/class/net/<iface>.
+# TYPE node_network_address_assign_type gauge
+node_network_address_assign_type{interface="eth0"} 3
+# HELP node_network_carrier carrier value of /sys/class/net/<iface>.
+# TYPE node_network_carrier gauge
+node_network_carrier{interface="eth0"} 1
+# HELP node_network_carrier_changes_total carrier_changes_total value of /sys/class/net/<iface>.
+# TYPE node_network_carrier_changes_total counter
+node_network_carrier_changes_total{interface="eth0"} 2
+# HELP node_network_carrier_down_changes_total carrier_down_changes_total value of /sys/class/net/<iface>.
+# TYPE node_network_carrier_down_changes_total counter
+node_network_carrier_down_changes_total{interface="eth0"} 1
+# HELP node_network_carrier_up_changes_total carrier_up_changes_total value of /sys/class/net/<iface>.
+# TYPE node_network_carrier_up_changes_total counter
+node_network_carrier_up_changes_total{interface="eth0"} 1
+# HELP node_network_device_id device_id value of /sys/class/net/<iface>.
+# TYPE node_network_device_id gauge
+node_network_device_id{interface="eth0"} 32
+# HELP node_network_dormant dormant value of /sys/class/net/<iface>.
+# TYPE node_network_dormant gauge
+node_network_dormant{interface="eth0"} 1
+# HELP node_network_flags flags value of /sys/class/net/<iface>.
+# TYPE node_network_flags gauge
+node_network_flags{interface="eth0"} 4867
+# HELP node_network_iface_id iface_id value of /sys/class/net/<iface>.
+# TYPE node_network_iface_id gauge
+node_network_iface_id{interface="eth0"} 2
+# HELP node_network_iface_link iface_link value of /sys/class/net/<iface>.
+# TYPE node_network_iface_link gauge
+node_network_iface_link{interface="eth0"} 2
+# HELP node_network_iface_link_mode iface_link_mode value of /sys/class/net/<iface>.
+# TYPE node_network_iface_link_mode gauge
+node_network_iface_link_mode{interface="eth0"} 1
+# HELP node_network_mtu_bytes mtu_bytes value of /sys/class/net/<iface>.
+# TYPE node_network_mtu_bytes gauge
+node_network_mtu_bytes{interface="eth0"} 1500
+# HELP node_network_name_assign_type name_assign_type value of /sys/class/net/<iface>.
+# TYPE node_network_name_assign_type gauge
+node_network_name_assign_type{interface="eth0"} 2
+# HELP node_network_net_dev_group net_dev_group value of /sys/class/net/<iface>.
+# TYPE node_network_net_dev_group gauge
+node_network_net_dev_group{interface="eth0"} 0
+# HELP node_network_protocol_type protocol_type value of /sys/class/net/<iface>.
+# TYPE node_network_protocol_type gauge
+node_network_protocol_type{interface="eth0"} 1
 # HELP node_network_receive_bytes_total Network device statistic receive_bytes.
 # TYPE node_network_receive_bytes_total counter
 node_network_receive_bytes_total{device="docker0"} 6.4910168e+07
@@ -1765,6 +1810,9 @@ node_network_receive_packets_total{device="tun0"} 24
 node_network_receive_packets_total{device="veth4B09XN"} 8
 node_network_receive_packets_total{device="wlan0"} 1.3899359e+07
 node_network_receive_packets_total{device="💩0"} 105557
+# HELP node_network_speed_bytes speed_bytes value of /sys/class/net/<iface>.
+# TYPE node_network_speed_bytes gauge
+node_network_speed_bytes{interface="eth0"} 1.25e+08
 # HELP node_network_transmit_bytes_total Network device statistic transmit_bytes.
 # TYPE node_network_transmit_bytes_total counter
 node_network_transmit_bytes_total{device="docker0"} 2.681662018e+09
@@ -1861,6 +1909,12 @@ node_network_transmit_packets_total{device="tun0"} 934
 node_network_transmit_packets_total{device="veth4B09XN"} 10640
 node_network_transmit_packets_total{device="wlan0"} 1.17262e+07
 node_network_transmit_packets_total{device="💩0"} 304261
+# HELP node_network_transmit_queue_length transmit_queue_length value of /sys/class/net/<iface>.
+# TYPE node_network_transmit_queue_length gauge
+node_network_transmit_queue_length{interface="eth0"} 1000
+# HELP node_network_up Valid operstate for interface.
+# TYPE node_network_up gauge
+node_network_up{address="01:01:01:01:01:01",broadcast="ff:ff:ff:ff:ff:ff",duplex="full",ifalias="",interface="eth0",operstate="up"} 1
 # HELP node_nf_conntrack_entries Number of currently allocated flow entries for connection tracking.
 # TYPE node_nf_conntrack_entries gauge
 node_nf_conntrack_entries 123
@@ -2165,6 +2219,7 @@ node_scrape_collector_success{collector="mdadm"} 1
 node_scrape_collector_success{collector="meminfo"} 1
 node_scrape_collector_success{collector="meminfo_numa"} 1
 node_scrape_collector_success{collector="mountstats"} 1
+node_scrape_collector_success{collector="netclass"} 1
 node_scrape_collector_success{collector="netdev"} 1
 node_scrape_collector_success{collector="netstat"} 1
 node_scrape_collector_success{collector="nfs"} 1