Module observer 

Metrics Observer for Pipeline Processing

This module provides a metrics observer that integrates with the pipeline processing system to collect and report real-time metrics to Prometheus. It implements the ProcessingObserver trait to receive processing events and update metrics accordingly.

Overview

The metrics observer provides:

• Real-Time Metrics: Collects metrics during pipeline processing
• Prometheus Integration: Updates Prometheus metrics for monitoring
• Performance Tracking: Tracks throughput, duration, and progress
• Atomic Operations: Thread-safe metric updates using atomic operations
• Event-Driven: Responds to processing events from the pipeline

Architecture

The observer follows the Observer pattern:

• Event Subscription: Subscribes to pipeline processing events
• Metric Collection: Collects metrics from processing events
• Atomic Updates: Uses atomic operations for thread-safe updates
• Service Integration: Integrates with the metrics service for reporting

Metrics Collected

Processing Metrics

• Total Bytes: Total bytes to be processed
• Processed Bytes: Bytes processed so far
• Throughput: Processing throughput in MB/s
• Duration: Processing duration for chunks and overall processing

Chunk Metrics

• Chunk Count: Number of chunks processed
• Chunk Size: Size of individual chunks
• Chunk Duration: Time taken to process each chunk
• Chunk Progress: Progress tracking for chunk processing

Performance Metrics

• Real-Time Throughput: Calculated throughput based on elapsed time
• Average Throughput: Average throughput over processing duration
• Peak Throughput: Maximum observed throughput
• Processing Efficiency: Efficiency metrics for performance analysis

Usage Examples

Basic Observer Setup

Integration with Pipeline

Event Handling

The observer handles these processing events:

Processing Started

• Records total bytes to be processed
• Initializes processing start time
• Resets processing counters

Chunk Started

• Records chunk size and ID
• Updates current chunk tracking
• Logs chunk processing start

Chunk Completed

• Records chunk processing duration
• Updates processed bytes counter
• Increments chunk completion counter
• Updates throughput metrics

Progress Update

• Updates processed bytes counter
• Calculates real-time throughput
• Updates throughput metrics
• Logs progress information

Processing Completed

• Records total processing duration
• Calculates final throughput
• Updates completion metrics
• Logs processing completion

Performance Characteristics

• Low Overhead: Minimal impact on processing performance
• Atomic Operations: Thread-safe updates without locks
• Efficient Calculations: Optimized throughput calculations
• Memory Efficient: Minimal memory usage for metric tracking

Thread Safety

The observer is thread-safe:

• Uses atomic operations for counters
• Immutable configuration after creation
• Safe concurrent access from multiple threads

Integration

Integrates with:

• Pipeline Service: Receives processing events
• Metrics Service: Reports metrics to Prometheus
• Observability Service: Provides observability data
• Monitoring Systems: Feeds data to monitoring dashboards

Structs

MetricsObserver

Metrics observer that collects and reports pipeline processing metrics to Prometheus.