3.8 KiB
id | title | sidebar_label |
---|---|---|
telemetry | Tracing and Metrics | Telemetry |
import useBaseUrl from '@docusaurus/useBaseUrl'; // Add to the top of the file below the front matter.
Having observability and telemetry is at the core of any production ready service. Super Graph has built-in support for OpenCensus for tracing requests all the way from HTTP to the database and providing all kinds of metrics.
OpenCensus has a concept called exporters these are external services that can consume this data and make to give you graphs, charts, alerting etc. Super Graph again has built-in support for Zipkin, Prometheus, Google Stackdriver and the AWS X-Ray exporters.
Telemetry config
The telemetry
section of the standard config files is where you set values to configure this feature to your needs.
telemetry:
debug: true
interval: 5s
metrics:
exporter: "prometheus"
endpoint: ""
namespace: "web api"
key: "1234xyz"
tracing:
exporter: "zipkin"
endpoint: "http://zipkin:9411/api/v2/spans"
sample: 0.2
include_query: false
include_params: false
debug: Enabling debug enables an embedded web ui to test and debug tracing and metrics. This UI called zPages
is provided by OpenCensus and will be made available on the /telemetry
path. For more information on using zPages
https://opencensus.io/zpages/. Remeber to disable this in production.
interval: This controls the interval setting for OpenCensus metrics collection. This deafaults to 5 seconds
if not set.
metric.exporters Setting this enables metrics collection. The supported values for this field are prometheus
and stackdriver
. The Prometheus exporter requires metric.namespace
to be set. The Sackdriver exporter requires the metric.key
to be set to the Google Cloud Project ID.
metric.endpoint Is not currently used by any of the exporters.
tracing.exporter Setting this enables request tracing. The supported values for this field are zipkin
, aws
and xray
. Zipkin requires tracing.endpoint
to be set. AWS and Xray are the same and do not require any addiitonal settings.
tracing.sample This controls what percentage of the requests should be traced. By default 0.5
or 50% of the requests are traced, always
is also a valid value for this field and it means all requests will be traced.
include_query Include the Super Graph SQL query to the trace. Be careful with this setting in production it will add the entire SQL query to the trace. This can be veru useful to debug slow requests.
include_params Include the Super Graph SQL query parameters to the trace. Be careful with this setting in production it will it can potentially leak sensitive user information into tracing logs.
Using Zipkin
Zipkin is a really great open source request tracing project. It's easy to add to your current Super Graph app as a way to test tracing in development. Add the following to the Super Graph generated docker-compose.yml
file. Also add zipkin
in your current apps depends_on
list. Once setup the Zipkin UI is available at http://localhost:9411
your_api:
...
depends_on:
- db
- zipkin
zipkin:
image: openzipkin/zipkin-slim
container_name: zipkin
# Environment settings are defined here https://github.com/openzipkin/zipkin/blob/master/zipkin-server/README.md#environment-variables
environment:
- STORAGE_TYPE=mem
# Uncomment to enable self-tracing
# - SELF_TRACING_ENABLED=true
# Uncomment to enable debug logging
# - JAVA_OPTS=-Dorg.slf4j.simpleLogger.log.zipkin2=debug
ports:
# Port used for the Zipkin UI and HTTP Api
- 9411:9411
Zipkin HTTP to DB traces
<img alt="Zipkin Traces" src={useBaseUrl("img/zipkin1.png")} />
Zipkin trace details
<img alt="Zipkin Traces" src={useBaseUrl('img/zipkin2.png')} />