Node Graph
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The Node graph can visualize directed graphs or networks. It uses a directed force layout to effectively position the nodes, so it can display complex infrastructure maps, hierarchies, or execution diagrams.
The Node graph panel requires specific shape of the data to be able to display its nodes and edges. This means not every data source or query can be visualized in this panel. If you want to use this as a data source developer see the section about data API.
The Node graph visualization consists of nodes and edges.
A node is displayed as a circle. A node might represent an application, a service, or anything else that is relevant from an application perspective.
An edge is displayed as a line that connects two nodes. The connection might be a request, an execution, or some other relationship between the two nodes.
Both nodes and edges can have associated metadata or statistics. The data source defines what information and values is shown, so different data sources can show different type of values or not show some values.
Note: Node graph can show only 1,500 nodes. If this limit is crossed a warning will be visible in upper right corner, and some nodes will be hidden. You can expand hidden parts of the graph by clicking on the “Hidden nodes” markers in the graph.
Usually, nodes show two statistical values inside the node and two identifiers just below the node, usually name and type. Nodes can also show another set of values as a color circle around the node, with sections of different color represents different values that should add up to 1.
Edges can also show statistics when you hover over the edge. Similar to nodes, you can open a context menu with additional details and links by clicking on the edge.
You can pan and zoom in or out the node graph.
You can pan the view by clicking outside any node or edge and dragging your mouse.
Use the buttons in the upper left corner or use the mouse wheel, touchpad scroll, together with either Ctrl or Cmd key to zoom in or out.
The number of nodes shown at a given time is limited to maintain a reasonable visualization performance. Nodes that are not currently visible are hidden behind clickable markers that show an approximate number of hidden nodes that are connected by a particular edge. You can click on the marker to expand the graph around that node.
You can switch to the grid view to have a better overview of the most interesting nodes in the graph. Grid view shows nodes in a grid without edges and can be sorted by stats shown inside the node or by stats represented by the a colored border of the nodes.
To sort the nodes, click on the stats inside the legend. The marker next to the stat name shows which stat is currently used for sorting and sorting direction.
Click on the node and select “Show in Graph layout” option to switch back to graph layout and focus on the selected node, to show it in context of the full graph.
This visualization needs a specific shape of the data to be returned from the data source in order to correctly display it.
Node Graph at minimum requires a data frame describing the edges of the graph. By default, node graph will compute the nodes and any stats based on this data frame. Optionally a second data frame describing the nodes can be sent in case there is need to show more node specific metadata. You have to set frame.meta.preferredVisualisationType = 'nodeGraph' on both data frames or name them nodes and edges respectively for the node graph to render.
Required fields:
Field name
Type
Description
id
string
Unique identifier of the edge.
source
string
Id of the source node.
target
string
Id of the target.
Optional fields:
Field name
Type
Description
mainstat
string/number
First stat shown in the overlay when hovering over the edge. It can be a string showing the value as is or it can be a number. If it is a number, any unit associated with that field is also shown
secondarystat
string/number
Same as mainStat, but shown right under it.
detail__*
string/number
Any field prefixed with detail__ will be shown in the header of context menu when clicked on the edge. Use config.displayName for more human readable label.
Required fields:
Field name
Type
Description
id
string
Unique identifier of the node. This ID is referenced by edge in its source and target field.
Optional fields:
Field name
Type
Description
title
string
Name of the node visible in just under the node.
subtitle
string
Additional, name, type or other identifier shown under the title.
mainstat
string/number
First stat shown inside the node itself. It can either be a string showing the value as is or a number. If it is a number, any unit associated with that field is also shown.
secondarystat
string/number
Same as mainStat, but shown under it inside the node.
arc__*
number
Any field prefixed with arc__ will be used to create the color circle around the node. All values in these fields should add up to 1. You can specify color using config.color.fixedColor.
detail__*
string/number
Any field prefixed with detail__ will be shown in the header of context menu when clicked on the node. Use config.displayName for more human readable label.
color
string/number
Can be used to specify a single color instead of using the arc__ fields to specify color sections. It can be either a string which should then be an acceptable HTML color string or it can be a number in which case the behaviour depends on field.config.color.mode setting. This can be for example used to create gradient colors controlled by the field value.
icon
string
Name of the icon to show inside the node instead of the default stats. Only Algology built in icons are allowed (see the available icons ).