@hyperledger/cactus-plugin-consortium-manual

Prometheus Exporter

This class creates a prometheus exporter, which scrapes the total Cactus node count.

Usage Prometheus

The prometheus exporter object is initialized in the PluginConsortiumManual class constructor itself, so instantiating the object of the PluginConsortiumManual class, gives access to the exporter object. You can also initialize the prometheus exporter object seperately and then pass it to the IPluginConsortiumManualOptions interface for PluginConsortiumManual constructor.

getPrometheusMetricsV1 function returns the prometheus exporter metrics, currently displaying the total cactus node count, which currently refreshes to match the node count in the consortium, everytime updateMetricNodeCount method of the PluginConsortiumManual class is called.

Prometheus Integration

To use Prometheus with this exporter make sure to install Prometheus main component. Once Prometheus is setup, the corresponding scrape_config needs to be added to the prometheus.yml

- job_name: 'consortium_manual_exporter'
  metrics_path: api/v1/plugins/@hyperledger/cactus-plugin-consortium-manual/get-prometheus-exporter-metrics
  scrape_interval: 5s
  static_configs:
    - targets: ['{host}:{port}']

Here the host:port is where the prometheus exporter metrics are exposed. The test cases (For example, packages/cactus-plugin-consortium-manual/src/test/typescript/unit/consortium/get-node-jws-endpoint-v1.test.ts) exposes it over 0.0.0.0 and a random port(). The random port can be found in the running logs of the test case and looks like (42379 in the below mentioned URL) Metrics URL: http://0.0.0.0:42379/api/v1/plugins/@hyperledger/cactus-plugin-consortium-manual/get-prometheus-exporter-metrics

Once edited, you can start the prometheus service by referencing the above edited prometheus.yml file. On the prometheus graphical interface (defaulted to http://localhost:9090), choose Graph from the menu bar, then select the Console tab. From the Insert metric at cursor drop down, select cactus_consortium_manual_total_node_count and click execute

Helper code

response.type.ts

This file contains the various responses of the metrics.

data-fetcher.ts

This file contains functions encasing the logic to process the data points.

metrics.ts

This file lists all the prometheus metrics and what they are used for.