Apollo Prometheus Exporter

Plugin for Apollo Server to export metrics in Prometheus format.

It uses prom-client under the hood the export the metrics.

Since Apollo Server released a new major version, a new version (v2.x.y) of the exporter has been launched. Apollo Server v2 is still supported in v1.x.y. The two versions will be features-matched as much as possible.

Metrics

Name	Description	Type
apollo_server_starting	The last timestamp when Apollo Server was starting.	Gauge
apollo_server_closing	The last timestamp when Apollo Server was closing.	Gauge
apollo_query_started	The amount of received queries.	Counter
apollo_query_failed	The amount of queries that failed.	Counter
apollo_query_parse_started	The amount of queries for which parsing has started.	Counter
apollo_query_parse_failed	The amount of queries for which parsing has failed.	Counter
apollo_query_validation_started	The amount of queries for which validation has started.	Counter
apollo_query_validation_failed	The amount of queries for which validation has failed.	Counter
apollo_query_resolved	The amount of queries which could be resolved.	Counter
apollo_query_execution_started	The amount of queries for which execution has started.	Counter
apollo_query_execution_failed	The amount of queries for which execution has failed.	Counter
apollo_query_duration	The total duration of a query.	Histogram
apollo_query_field_resolution_duration	The total duration for resolving fields.	Histogram

For default metrics, please refer to prom-client default metrics.

Usage

1. Install prom-client and @bmatei/apollo-prometheus-exporter

   npm install prom-client @bmatei/apollo-prometheus-exporter

2. Create an instance of the plugin

   const app = express();
   
   const prometheusExporterPlugin = createPrometheusExporterPlugin({ app });

3. Add the plugin to ApolloServer

   const server = new ApolloServer({
     plugins: [prometheusExporterPlugin]
   });

For a complete working example, please have a look over the example project in this repository.

Options

Name	Description	Type	Default Value
app	Express instance. For the moment it is used for defining the metrics endpoint. It is mandatory unless metricsEndpoint is set to false.	Express	undefined
defaultLabels	An object containing default labels to be sent with each metric.	Object	{}
defaultMetrics	Flag to enable/disable the default metrics registered by prom-client.	Boolean	true
defaultMetricsOptions	Configuration object for the default metrics.	DefaultMetricsCollectorConfiguration	{}
durationHistogramBuckets	A list of durations that should be used by histograms.	number[]	[0.001, 0.005, 0.015, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 1, 5, 10]
hostnameLabel	Flag to enable/disable hostname label.	Boolean	true
hostnameLabelName	The name of the hostname label.	String	hostname
metricsEndpoint	Flag to enable/disable the metrics endpoint. If you disable this, you can use the registerPrometheusMetricsEndpoint method to enable the metrics endpoint.	Boolean	true
metricsEndpointPath	HTTP path where the metrics will be published.	String	"/metrics"
register	Prometheus client registry to be used by Apollo Metrics. By default, it is also used by the default metrics.	Registry	register
skipMetrics	A key-value map that controls if a metric is enabled or disabled.	SkipMetricsMap	{}

Thanks

• prom-client
• apollo-metrics