prometheus-png

PNG renderer for prometheus based on carbonapi

Example

http://localhost:8080/?g0.expr=min(noolite_rx_sensor_temp_celsius)by(ch)&from=-7d&width=600&height=400&title=Temp

Run

docker run --rm -p 8080:8080 lomik/prometheus-png:latest -prometheus "http://127.0.0.1:9090/"

Configuration

Command line options

Usage of ./prometheus-png:
  -config string
    	Config filename. Only TOML format is supported
  -config-print-default
    	Print default config
  -httptest.serve string
    	if non-empty, httptest.NewServer serves on this address and blocks
  -listen string
    	Listen addr (default ":8080")
  -prometheus string
    	Prometheus addr (default "http://127.0.0.1:9090")
  -prometheus.path string
    	Path to query_range endpoint (default "/api/v1/query_range")
  -timeout duration
    	Default timeout for queries (default 10s)

Config file

# You can use special macros "${ENV:VARIABLE_NAME}" in config
# It will be replaced to environment variable value before parse TOML
[main]
listen = ":8080"
prometheus-addr = "http://127.0.0.1:9090/"
prometheus-path = "/api/v1/query_range"
timeout = "10s"

# All GET-parameters from carbonapi for format=png is allowed in templates
# https://github.com/go-graphite/carbonapi/blob/master/cmd/carbonapi/COMPATIBILITY.md#render
[template.default]
# grafana colors
areaMode = "all"
colorList = "7EB26D,EAB839,6ED0E0,EF843C,E24D42,1F78C1,BA43A9,705DA0,508642,CCA300,447EBC,C15C17,890F02,0A437C,6D1F62,584477,B7DBAB,F4D598,70DBED,F9BA8F,F29191,82B5D8,E5A8E2,AEA2E0,629E51,E5AC0E,64B0C8,E0752D,BF1B00,0A50A1,962D82,614D93,9AC48A,F2C96D,65C5DB,F9934E,EA6460,5195CE,D683CE,806EB7,3F6833,967302,2F575E,99440A,58140C,052B51,511749,3F2B5B,E0F9D7,FCEACA,CFFAFF,F9E2D2,FCE2DE,BADFF4,F9D9F9,DEDAF7"
majorGridLineColor = "808080"
minorGridLineColor = "808080"
bgcolor = "171819"
areaAlpha = 0.09
fontName = "Roboto"

[template.graphite]
areaMode = "none"
colorList = "blue,green,red,purple,brown,yellow,aqua,grey,magenta,pink,gold,rose"
majorGridLineColor = "white"
minorGridLineColor = "grey"
areaAlpha = "NaN"
fontName = "Sans"
bgcolor = "black"

URI Parameters

• g0.expr, g1.expr, ..., gN.expr - prometheus queries
• g0.legend, g1.legend, ..., gN.legend - custom legend template. Tag values can be printed with {{.tagname}} instruction
• gN.filter[labelName]=labelValue - display only series with corresponding label values
• timeout - optional custom query timeout
• pixelRatio - device pixel ratio
• template - template name from config
• all GET-parameters from carbonapi for format=png

Build

git clone https://github.com/lomik/prometheus-png.git
cd prometheus-png
make

Build macOS

brew install Caskroom/cask/xquartz
brew install cairo --with-x11
export PKG_CONFIG_PATH=/opt/X11/lib/pkgconfig
git clone https://github.com/lomik/prometheus-png.git
cd prometheus-png
make