Some releases may have non letters in it's name currently resulting in
an empty ("") output which is then discarded, resulting in *missing*
labels in the metric.

Now it uses `.-` to catch as little as possible, but anything.

Signed-off-by: Paul Spooren <mail@aparcar.org>

adds openwrt specific information about the device.
include DISTRIB_{ID, RELEASE, REVISION}, board_name and model

Example output:

    # TYPE node_openwrt_info gauge
    node_openwrt_info{revision="55a0636",model="QEMU Standard PC (i440FX + PIIX, 1996)",id="LiMe",board_name="qemu-standard-pc-i440fx-piix-1996",release="snapshot"} 1
    node_scrape_collector_duration_seconds{collector="openwrt"} 3.814697265625e-05
    node_scrape_collector_success{collector="openwrt"} 1

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

Print all files from /var/prometheus/*.prom. This behaviour allow users
to add metrics with non-lua scripts.

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

Now monitors as well the tunIn parameters, aka the annoucend routes to
the network. This is handy to check if a node annouces itself as a
gateway.

Also list all activated plugins.

Example output:

    # TYPE bmx7_tunIn gauge
    bmx7_tunIn{name="myIP4",network="10.198.52.86/32"} 1
    bmx7_tunIn{name="myIP6",network="2012:0:0:56::/128"} 1
    bmx7_tunIn{name="inet4",network="0.0.0.0/0"} 1
    # TYPE bmx7_plugin gauge
    bmx7_plugin{name="bmx7_config.so"} 1
    bmx7_plugin{name="bmx7_json.so"} 1
    bmx7_plugin{name="bmx7_sms.so"} 1
    bmx7_plugin{name="bmx7_tun.so"} 1

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

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>

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>

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>