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stats-opencensus-backend

Motivation

OpenCensus is a compelling project. Customarily, monitoring (and trace) solutions require client applications to use a specific service's proprietary API. Once the client application is written, it's forever bound to a specific monitoring solution. But, that's not what's wanted. OpenCensus decouples metric production from consumption. You write monitoring (and trace) code once and then -- at production time !! -- your DevOps or SRE folks use whichever monitoring system they prefer.

Statsd is a compelling project. It is a widely used mechanism for the lightweight (udp not tcp) shipping of metrics (counters, gauges and timers). The project currently supports multiple backends too but it did not support OpenCensus.

Stats+OpenCensus means that any application currently shipping metrics using statsd can now be monitored (in principle) by any monitoring solution supported by OpenCensus (by Node.JS... unfortunately, these remain langauge-dependent). Ironically, OpenCensus only supports Stackdriver and Prometheus (in Node.JS) today but, as more systems are added (as they will be), these will become immediately available to statsd applications.

Write-up

here

Clone

You'll need to npm install from within both directories.

Enable Stackdriver (Optional)

Create GCP Project and enable billing

As I learned, if you miss the "enable billing" step, you will not receive metrics data in Stackdriver

PROJECT=[[YOUR-PROJECT]]
BILLING=[[YOUR-BILLING]]

gcloud projects create ${PROJECT}

gcloud beta billing projects link ${PROJECT} \
--billing-account=${BILLING}

Create Stackdriver Workspace

Unfortunately, there's no accessible API nor CLI for this:

google-chrome console.cloud.google.com/monitoring/?project=${PROJECT}

Create service account

w/ Stackdriver permissions (roles/monitoring.metricWriter) and download the key

ACCOUNT=[[YOUR-SERVICE-ACCOUNT]]
ADDRESS=${ACCOUNT}@${PROJECT}.iam.gserviceaccount.com

WORK=[[YOUR-WORKING-DIRECTORY]]
FILE="${WORK}/${ACCOUNT}.key.json"

gcloud iam service-accounts create ${ACCOUNT} \
--display-name=${ACCOUNT} \
--project=${PROJECT}

gcloud projects add-iam-policy-binding ${PROJECT} \
--member=serviceAccount:${ADDRESS} \
--role=roles/monitoring.metricWriter

gcloud iam service-accounts keys create ${FILE} \
--iam-account=${ACCOUNT}@${PROJECT}.iam.gserviceaccount.com \
--project=${PROJECT}

Configure statsd for OpenCensus+Stackdriver

From within the etsy statsd directory:

EXPORT GOOGLE_APPLICATION_CREDENTIALS = ${PWD}/key.json

config.js

{
    flushInterval: 5000,
    backends: [
        "[[PATH-TO]]/statsd-opencensus-backend"
    ],
    opencensus:{
        stackdriver: {
            projectId: [[YOUR-PROJECT]]
        }
    }
}

Configure statsd for OpenCensus+Prometheus

Currently prometheus is enabled by default and exports on ::9464

From within the etsy statsd directory:

config.js

{
    flushInterval: 5000,
    backends: [
        "[[PATH-TO]]/statsd-opencensus-backend"
    ],
    opencensus:{
        prometheus: {
            port: [[YOUR-PORT]]
        }
    }
}

Run statsd

Then run it:

node stats.js /path/to/yourConfig.js

Test

Test it by publishing a counter:

echo "foo:1|c" | nc -u -w0 127.0.0.1 8125

...or many:

while true
do
  COUNTER="foo:1|c"
  echo ${COUNTER}
  echo ${COUNTER} |  nc -u -w0 127.0.0.1 8125
  sleep 1s
done

Observe counters created in Stackdriver either through the console or APIs Explorer (more to come)

Test it by pushing a gauge:

echo "bar:3.14159|g" | nc -u -w0 127.0.0.1 8125

...or many:

while true
do
  GAUGE="bar:$(awk -v min=0 -v max=99 'BEGIN{srand(); print min+rand()*(max-min+1)}')|g"
  echo ${GAUGE}
  echo ${GAUGE} |  nc -u -w0 127.0.0.1 8125
  sleep 1s
done

Visualize

Stackdriver

Prometheus

The statsd server hosts a Prometheus Metrics Exporter on the previously designated port (::8464).

You may visualize the metrics data (and hit refresh to update) by browsing localhost:8464

# HELP statsd_bad_lines_seen None provided
# TYPE statsd_bad_lines_seen counter
statsd_bad_lines_seen{status="OK"} 40

# HELP statsd_packets_received None provided
# TYPE statsd_packets_received counter
statsd_packets_received{status="OK"} 40

# HELP statsd_metrics_received None provided
# TYPE statsd_metrics_received counter
statsd_metrics_received{status="OK"} 40

# HELP foo None provided
# TYPE foo counter
foo{status="OK"} 40

# HELP bar None provided
# TYPE bar gauge
bar{status="OK"} 1949.1418679999997

# HELP statsd_timestamp_lag None provided
# TYPE statsd_timestamp_lag gauge
statsd_timestamp_lag{status="OK"} 38