This topic describes how the WombatOAM Dashboard can be used.
WombatOAM’s monitoring features are accessible from the web dashboard. You can use the dashboard to manage nodes, and view metrics, notifications and alarms. The following is an overview of WombatOAM’s monitoring features, with details about how to access these features, where relevant.
Topology is an entry point for all tools that allow you to inspect and monitor a node as a whole.
- Add nodes: Topology → Add Node. If you select the “Discover connected nodes” checkbox, all nodes that are connected to the given node (including hidden nodes) that have the same cookie will be installed into WombatOAM.
- View node information: Topology → Node Info → select a node or node family.
- Observe the status of the nodes (UP/DOWN) in the node tree panel. WombatOAM automatically recognizes if a node goes down or if it comes up again.
- View plugin information, plugin state, and turn plugins on or off.
- Remove nodes or node families: Topology → Node Info → select a node or node family → Remove node or Remove node family.
- View a visual representation of the system: Topology → Node Graph.
Metrics are useful for recognizing trends and troubleshooting systems if failure occurs. Nodes are grouped by families, so you can view metrics for a family or for individual nodes. Different metrics can be combined on the same graph.
- View numeric metrics: Metrics → Numeric Metrics → select a node → select a metric. A new data point in the total memory graph arrives every 60 seconds (configurable). If you select a node family, the metrics of the nodes are stacked onto each other.
- WombatOAM has 90 built-in metrics; it also collects folsom and exometer metrics created on the node, as well as metrics from custom plugins, allowing you to combine business and system metrics.
- WombatOAM can push the metrics to other OAM tools. This means that you can integrate WombatOAM metrics with other metrics that aren’t Erlang-related.
With Notifications, you can view important crash and error reports from all nodes in one place. When a crash occurs, this should be the first port of call. All alarms raised and cleared are also logged under Notifications, along with all shell interactions, modules loaded and purged, and so forth.
- View notifications: Notifications → Manage Notifications → select a
node. WombatOAM displays logs created with
lagerfrom the managed nodes.
- Search notifications: Notifications → Manage Notifications → enter a value in the search box.
- Popup notifications are shown for events that are at “error” level or higher.
- The level of log entries to be collected is configurable.
You should check alarm logs regularly, and address them if necessary. All alarms raised and cleared are also logged under Notifications, in case you miss an alarm being raised and cleared.
- View alarms: Alarms → Manage Alarms. This shows the alarms raised by WombatOAM (for example, if a node went down). Alarms can also be cleared by WombatOAM (for example, when a node comes up again).
- Users can acknowledge, unacknowledge, clear, and comment on alarms.
- The web dashboard displays popup notifications for new alarms.
- WombatOAM generates notifications from alarm events (displayed in the Notifications tab).
If you click on the WombatOAM icon or WombatOAM text, you will see the front page with selected information (metrics, alarms, node statistics). Users can create their own pages with the following constraints:
- Every page has a name which is unique.
- Users can create, modify or delete pages.
- It is not allowed to modify or delete a page that is not owned by the user, except if it is not owned by anyone.
- The admin user can create, modify or delete any page, but even the admin cannot delete the default page.
- When a user is deleted, the admin can decide whether to delete the user’s pages too. If they are not deleted, they will not be owned by anyone.
- If authentication is switched off, users have the same rights as admins when authentication is on.