scrapes bmx6 status and connected links.

example output:

    bmx6_status{id="qMp-LibreMesh-1706",version="BMX6-0.1-alpha",address="fd66:66:66:a:6670:2ff:fe3e:9d28"} 1
    bmx6_link_rxRate{target="UPC-CN-C6-E104-Alix",source="qMp-LibreMesh-1706",dev="wlan0-mesh_12"} 100
    bmx6_link_txRate{target="UPC-CN-C6-E104-Alix",source="qMp-LibreMesh-1706",dev="wlan0-mesh_12"} 100
    bmx6_link_rxRate{target="UPC-CN-C6-E104-Alix-Paul",source="qMp-LibreMesh-1706",dev="wlan1-adhoc_12"} 100
    bmx6_link_txRate{target="UPC-CN-C6-E104-Alix-Paul",source="qMp-LibreMesh-1706",dev="wlan1-adhoc_12"} 100
    bmx6_link_rxRate{target="UPC-CN-C6-E104-Turoffner",source="qMp-LibreMesh-1706",dev="wlan0-mesh_12"} 97
    bmx6_link_txRate{target="UPC-CN-C6-E104-Turoffner",source="qMp-LibreMesh-1706",dev="wlan0-mesh_12"} 100
    node_scrape_collector_duration_seconds{collector="bmx6"} 0.0025260448455811
    node_scrape_collector_success{collector="bmx6"} 1
    scrapes bmx7 status and connected links.

example output:

    bmx7_status{id="C68791D2",revision="3a52f89",name="smpl-18f4ce",address="fd70:c687:91d2:8ab3:1a88:6b14:bad0:2b18"} 1
    bmx7_cpu_usage 0.7
    bmx7_mem_usage 3204000
    bmx7_link_rxRate{target="F48239CD",dev="wlan0-mesh_13",source="C68791D2",name="smpl-07889a"} 54000
    bmx7_link_txRate{target="F48239CD",dev="wlan0-mesh_13",source="C68791D2",name="smpl-07889a"} 52729
    node_scrape_collector_duration_seconds{collector="bmx7"} 0.0020999908447266
    node_scrape_collector_success{collector="bmx7"} 1

prometheus-node-exporter-lua: bmx6/7 netjson format

adds labels called source and target to links instead of only the target
previously called "id".

Retrieving all *links* from prometheus now makes it easier to create
a valid netjson(.org) graph.

It's not feasible to use *instance* as *source* as for instance likely
the name is used for dns, instead of the ID. Using the *name* instead of
*id* for netjson linking results in a bad graph when two devices have
the same (default) hostname.

Signed-off-by: Paul Spooren <spooren@informatik.uni-leipzig.de>

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

replace 2 string.match and 1 string.gmatch (space_split)
by 1 string.match

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

nat_traffic is too verbose to be really useful by default
netstat is broken by default on OpenWrt/LEDE

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

this allow to remove libubus-lua/libiwinfo-lua dependency from main package
this also allow to have different scrape_interval

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

split stations

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

As prometheus-node-exporter-lua is a reimplementation of node_exporter,
I'm using "collector" instead of "scraper" and renaming some collectors

put each collector in a separate file

report collector success/failure and duration per scrape
(follow https://github.com/prometheus/node_exporter/pull/516)

allow to filter collectors using "collect[]" params
(see https://github.com/prometheus/node_exporter#filtering-enabled-collectors)

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

On my bullet m2, scrape duration goes from between 0.2 and 0.5 to a stable 0.025
We also don't depend on luci anymore

This remove wifi_network_up metric, but this metric was buggy
wifi_network_up{ifname="wlan0-1",ssid="test1",channel="11",mode="Master",bssid="12:34:56:78:9A:BC",country="FR",frequency="2.462"} 1
wifi_network_up{ifname="radio0.network2",ssid="test1",channel="11",mode="Master",country="US",frequency="2.462"} 0

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

Testing on a bullet m2, uname collector was taking on average 0.12
it now takes 0.0007

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

also reduce calls to output()

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

Signed-off-by: Christian Simon <simon@swine.de>