Tinode Metric Exporter

This is a simple service which reads JSON monitoring data exposed by Tinode server using expvar and re-publishes it in other formats. Currently the supported formats are:

• InfluxDB exporter pushes data to its target backend. This is the default mode.
• Prometheus exporter which exports data in prometheus format. The Prometheus monitoring service is expected to pull/scrape data from the exporter.

Usage

Exporters are intended to run next to (pair with) Tinode servers: one Exporter per one Tinode server, i.e. a single Exporter provides metrics from a single Tinode server.

Configuration

The exporters are configured by command-line flags:

Common flags

• serve_for specifies which monitoring service the Exporter will gather metrics for; accepted values: influxdb, prometheus; default: influxdb.
• tinode_addr is the address where the Tinode instance publishes expvar data to scrape; default: http://localhost:6060/stats/expvar.
• listen_at is the hostname to bind to for serving the metrics; default: :6222.
• instance is the Exporter instance name (it may be exported to the upstream backend); default: exporter.
• metric_list is a comma-separated list of metrics to export; default: Version,LiveTopics,TotalTopics,LiveSessions,ClusterLeader,TotalClusterNodes,LiveClusterNodes,memstats.Alloc.

InfluxDB

• influx_push_addr is the address of InfluxDB target server where the data gets sent; default: http://localhost:9999/write.
• influx_db_version is the version of InfluxDB (only 1.7 and 2.0 are supported); default: 1.7.
• influx_organization specifies InfluxDB organization to push metrics as; default: test;
• influx_bucket is the name of InfluxDB storage bucket to store data in (used only in InfluxDB 2.0); default: test.
• influx_auth_token - InfluxDB authentication token; no default value.
• influx_push_interval - InfluxDB push interval in seconds; default: 30.

Example

Run InfluxDB Exporter as

./exporter \
    --serve_for=influxdb \
    --tinode_addr=http://localhost:6060/stats/expvar \
    --listen_at=:6222 \
    --instance=exp-0 \
    --influx_push_addr=http://my-influxdb-backend.net/write \
    --influx_db_version=1.7 \
    --influx_organization=myOrg \
    --influx_auth_token=myAuthToken123 \
    --influx_push_interval=30

This exporter will push the collected metrics to the specified backend once every 30 seconds.

Prometheus

• prom_namespace is a prefix to use for metrics names. If you are monitoring multiple tinode instances you may want to use different namespaces; default: tinode.
• prom_metrics_path is the path under which to expose the metrics for scraping; default: /metrics.
• prom_timeout is the Tinode connection timeout in seconds in response to Prometheus scrapes; default: 15.

Example

Run Prometheus Exporter as

./exporter \
    --serve_for=prometheus \
    --tinode_addr=http://localhost:6060/stats/expvar \
    --listen_at=:6222 \
    --instance=exp-0 \
    --prom_namespace=tinode \
    --prom_metrics_path=/metrics \
    --prom_timeout=15

This exporter will serve data at path /metrics, on port 6222. Once running, configure your Prometheus monitoring installation to collect data from this exporter.