│©2022 VMware, Inc. Observability of Your Application Jonatan Ivanov Tommy Ludwig Marcin Grzejszczak

Spring Observability Team Jonatan Ivanov Tommy Ludwig Marcin Grzejszczak

Architecture Tea Service Tealeaf Service DB Water Service DB Eureka Eureka

DEMO

Summary - We’ve managed to correlate - Logs to Traces (and vice versa) - Traces to Metrics (via common tags) - Metrics to Traces (via exemplars) to Logs - The Spring portfolio is instrumented - WebMVC, WebFlux, etc. instrumentation - Third-party libraries are also instrumented - jdbc-observations - OpenFeign - etc.

What’s (kind of) new in Micrometer? 1.9.0 - 2022 May - OTLP Registry (OpenTelemetry) - HighCardinalityTagsDetector - Exemplars (Prometheus)

Exemplars (Prometheus) “Metadata” that you can attach to your metrics Updated at measurement time (sampled) They are not tags (high cardinality) Usually traceId and spanId Correlate Metrics to Distributed Tracing and Logs Available for Counter and Histogram buckets

What’s new in Micrometer? 1.10.0 - 2022 November - Micrometer Tracing (Sleuth w/o Spring deps.) - Micrometer Docs Generator - Micrometer Context Propagation - Observation API (micrometer-core)

You want to instrument your application… - Add logs (application logs) - Add metrics - Increment Counters - Start/Stop Timers - Add Distributed Tracing - Start/Stop Spans - Log Correlation - Context Propagation

Observation observation = Observation.start("s1",registry); try (Observation.Scope scope = observation.openScope()) { Thread.sleep(1000); // Business logic } catch (Exception exception) { observation.error(exception); throw exception; } finally { // TODO: attach tags (key-value) observation.stop(); } Observation API (Micrometer 1.10)

ObservationRegistry registry = ObservationRegistry.create(); registry.observationConfig() .observationHandler(new MeterHandler(...)) .observationHandler(new TracingHandler(...)) .observationHandler(new LoggingHandler(...)) .observationHandler(new AuditEventHandler(...)); Observation observation = Observation.start("s1",registry); // let the fun begin… observation.stop(); Observation API (Micrometer 1.10)

Observation.createNotStarted("talk",registry) .lowCardinalityKeyValue("conference", "S1") .highCardinalityKeyValue("speakerId", speakerId) .observe(this::talk); @Observed Observation API (Micrometer 1.10)

│©2022 VMware, Inc. Thank You! github.com/jonatan-ivanov/teahouse