The document discusses observability in Java applications, emphasizing the importance of tracing, metrics, and logs to monitor service performance and resource usage. It highlights OpenTelemetry as a standardized solution for observability across programming languages and its integration with Spring Cloud Sleuth. The presentation includes practical applications and tools like the Pet Clinic project to demonstrate these concepts and solutions.

1. Peering inside the black box
Gergely Tóth
Java Platform Engineering

2. SPRING ONE, SEPTEMBER 2021 PUBLIC
What is my service up to?
Environment
How much memory is
available?
Are we going to run out of file
descriptors?
Interactions
How many incoming/outgoing
calls does it make?
What is the latency in
responding to requests?
Resource Usage
How much CPU are we
using?
How much heap are we
using?
Version
What version of the
application code is running?
What JDK is being used?

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Three Pillars of Observability
Tracing
Series of related distributed
events
Events generated in different
parts of the system for a
given user interaction
Metrics
Numeric representation of
measured data
Maximum response time for a
given endpoint
Number of calls to an
endpoint per seconds
Logs
Timestamped record of
events
Application startup and
graceful shutdown
Internal error detailed
information

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Cornucopia of options … OpenTelemetry
Standard solution
Provides a common single
API for observability
Supports the mayor
programing languages
Easy to use
Automatic instrumentation
using the agent
Easy to get started with any
application
Collector
Central place to receive,
process and export traces
and metrics (and logs)
W3C
Standard of context
propagation
Replaces homegrown formats
https://opentelemetry.io/img/logos/opentelemetry-stacked-color.png

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@NewSpan
public void getAnnotationForTagValueResolver(
@SpanTag(key = "test", resolver = TagValueResolver.class) String test) {
}
Spring Cloud Sleuth for tracing
Part of Spring ecosystem
Quick start: Spring initializr
Integrates with other
components
OpenTelemetry bridge
OpenTelemetry via Sleuth
Currently in incubation
https://spring.io/images/projects/spring-edf462fec682b9d48cf628eaf9e19521.svg

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Pet Clinic
https://github.com/spring-projects/spring-petclinic

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How to: Pet Clinic
Spring
Cloud
Gateway
Pet Clinic
Pet Clinic

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How to: Pet Clinic
Spring
Cloud
Gateway
Pet Clinic
Pet Clinic
OTEL
Collector

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How to: Pet Clinic
Spring
Cloud
Gateway
Pet Clinic
Pet Clinic
OTEL
Collector
Jaeger

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How to: Pet Clinic
Spring
Cloud
Gateway
Pet Clinic
Pet Clinic
OTEL
Collector
Jaeger
Zipkin

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How to: Pet Clinic
Spring
Cloud
Gateway
Pet Clinic
Pet Clinic
OTEL
Collector
Jaeger
Zipkin
Prometheus

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How to: Pet Clinic
Spring
Cloud
Gateway
Pet Clinic
Pet Clinic
OTEL
Collector
Jaeger
Zipkin
Prometheus
Grafana

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Demo

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▪ Getting live information about services is crucial
▪ There is a cornucopia of vendors/libs/frameworks that
provide observability
▪ These require specific dependency/agent for the services
▪ OpenTelemetry standardizes and gives a vendor
agnostic solution
▪ Spring already has a standard solution for traces: Sleuth
▪ Using the bridge between Sleuth and OpenTelemetry
provides an easy solution to benefit from both without
changing the already existing code
The story

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▪ Finalized Sleuth OpenTelemetry Bridge
▪ OpenTelemetry metrics SDK finalised
▪ OpenTelemetry for logs
▪ Integration of OpenTelemetry metrics export for
Spring
▪ Integration for OpenTelemetry logs export for Spring
What’s next?