Exploring Mobile Observability with OpenTelemetry

by Jitin

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Blrdroid Meetup, Nov 2024 Mobile Observability with OpenTelemetry Jitin Sharma, Groww

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Observability

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System Inputs Outputs

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Sum Machine 2,2 4

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Sum Machine 2,2 4 4,4 8

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Sum Machine 2,2 4 4,4 6,4 8 -1

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Sum Machine 2,2 4 4,4 6,4 8 -1

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Mobile Apps

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Mobile App User Action UI

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Mobile App Backend

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Mobile App Cell Tower CDN/ Gateway Backend

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Mobile App Cell Tower CDN/ Gateway Backend • OEM • Performance • OS Versions • Network state • User lifecycle

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Mobile App Cell Tower CDN/ Gateway Backend • OEM • Performance • OS Versions • Network state • User lifecycle Background Jobs Noti fi cations

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Mobile App Cell Tower CDN/ Gateway Backend • OEM • Performance • OS Versions • Network state • User lifecycle Background Jobs Noti fi cations Backend Code

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What could go wrong

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Issue due to wrong code

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Issue due to wrong code Network fl uctuations

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Issue due to wrong code Network fl uctuations Lifecycle actions

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Issue due to wrong code Network fl uctuations Lifecycle actions Device

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Issue due to wrong code Network fl uctuations Lifecycle actions Device OEM

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Issue due to wrong code Network fl uctuations Lifecycle actions Device OEM Pyramid of problems

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Issue due to wrong code Network fl uctuations Lifecycle actions Device OEM Pyramid of problems

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Existing tools

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System Inputs Outputs

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System Inputs Outputs

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Now what

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Start End P1 P2 P3 P4

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Custom Events App Monitoring - Crashes - Performance - … App Events - Navigation - Attributes - Custom events - …

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Problems? • Disconnected systems • Sampling • Delays and interval con fi guration • Data privacy • Costs

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OpenTelemetry

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What is OpenTelemetry - Framework to collect telemetry data - Vendor agnostic - Works across frameworks using agent libraries - Allows control over export of data

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OpenTelemetry Traces Metrics Logs

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Span Start End t0 tN attributes

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Span - Network Call Request Start • user identi fi er • os version • device model • network type Response Received

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Trace Span Span Span Span Span Span Span

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Trace Span Span Span Span Span Span Span trace id

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Distributed Tracing System 1 System 2 System 3 Spans Spans Spans Trace

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Distributed tracing on Mobile?

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Mobile App UI

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Mobile App Network Storage UI System Device

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Mobile App Network Storage UI System Retro fi t Workmanager Sqlite Shared Pref Recyclerview Device Lifecycle Memory CPU

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Mobile App Network Storage UI System Retro fi t Workmanager Sqlite Shared Pref Recyclerview Device Lifecycle Memory CPU Server Gateway Kafka DB

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Mobile App Network Storage UI System Retro fi t Workmanager Sqlite Shared Pref Recyclerview Device Lifecycle Memory CPU Server Gateway Kafka DB Span Span Span Span Span Span

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Additional Data Metrics - Counter - Timer - Histogram - Gauge Logs - Bridge to existing log libraries

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Show me code

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// Build instance val openTelemetry = otelRumBuilder.build().openTelemetry // Create a tracer openTelemetry.getTracer("network.call") // Create span val span = tracer.spanBuilder(spanName) .setAllAttributes(attributes) .startSpan()

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// Create span processor val processor = BatchSpanProcessor.builder( OtlpHttpSpanExporter.builder() .setEndpoint(endPoint) .build() ) // Attach processor to instance otelRumBuilder.addTracerProviderCustomizer { builder -> builder.addSpanProcessor(processor) }

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// Build instance val openTelemetry = otelRumBuilder.build().openTelemetry // Create meter val meter = openTelemetry.getMeter("success.responses") // Build counter metric meter.counterBuilder(name) .setDescription(description) .setUnit(unit) .build()

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val reader = PeriodicMetricReader.builder( OtlpHttpMetricExporter.builder() .setEndpoint(endPoint) .build() ) otelRumBuilder.addMeterProviderCustomizer { builder -> builder.registerMetricReader(reader) }

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OpenTelemetry Android

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Auto Instrumentation • App Launch trace • Lifecycle traces • Network call traces • Slow rendering traces • Crash detection • Network change detection • Disk persistence • Automatic device attributes

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Data Visualisation

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Visualisations (OTLP)

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Visualisations (OTLP) Otel Collector

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Why OpenTelemetry

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• Powerful API • Open and mature ecosystem • Total control over data • Collaborative development • Observability beyond crashes

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Is it stable?

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Is it stable?

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Do you need advanced observability?

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• It depends • Without scale, existing solutions might just work. • Ecosystem under active development