Sientia DataOps Laborious

A comprehensive, Temporal-based ML orchestration system for industrial data processing and model inference. Laborious delivers enterprise-grade batch prediction, model management, optional real-time export (OPC), and automated retraining with strong data quality validation and observability.

📑 Table of Contents

• Features
  • Core Functionality
  • Advanced Capabilities
  • Development & Quality Assurance
• Architecture
  • Architecture Principles
  • Key Components
  • Data Flow Architecture
  • Security Architecture
• Workflows
  • Predictions Batch Workflow
  • Prediction Process Workflow
  • Format and Export Prediction Workflow
  • Minimal Retrain Workflow
• Installation & Setup
  • Prerequisites
  • Environment Setup
  • Temporal Namespace Setup
  • Local Development Setup
• How to Run
  • Running the Laborious Application
  • Running Tests and Coverage
  • Manual Test Execution
  • Manual Application Execution
• Code Quality & Validation
  • Overview
  • Validation Tools
  • Tools Installation
  • Complete Validation
  • Automatic Fixes
  • Configuration
  • CI/CD Integration
  • Best Practices
• Testing
  • Test Structure
  • Test Execution
• Monitoring and Metrics
  • Application Health Metrics
  • Prediction Operation Metrics
  • OPC Export Metrics
  • Data Quality Metrics
• Configuration
  • Environment Variables
  • OPC Configuration
  • Workflow Configuration
• Development
  • Project Structure
  • Adding New Features
• Troubleshooting
  • Common Issues
  • Debug Mode
• Performance Tuning
  • Key Parameters
  • Scaling Considerations
• Contributing
  • Code Quality Standards
• License
• Support

Features

Core Functionality

• Batch Prediction Processing: High-throughput ML inference using MLFlow models
• Temporal Workflow Orchestration: Robust workflow management with retries and fault tolerance
• Data Quality Gates: Configurable filtering for input data and MLFlow API responses
• Multi-Model Support: Flexible model management with retention and versioning
• Optional Real-time Export: PostgreSQL persistence and OPC server integration for industrial systems
• Comprehensive Monitoring: Prometheus metrics and structured logging for observability

Advanced Capabilities

• Incremental Data Processing: Timestamp-based loading to avoid reprocessing
• Configurable Data Retention: Model retention policies with automatic cleanup
• Notification System: Integrated alerting via MongoDB
• Scalable Architecture: Kubernetes-ready with horizontal scaling
• Model Retraining: Automated retraining workflows with production model updates

Development & Quality Assurance

• Code Quality Tools: Ruff (lint/format), mypy (types), Bandit (security)
• Automated Validation: validate.sh and CI quality gates
• Comprehensive Testing: pytest with async support and high coverage
• Type Safety: Static type checking with mypy
• Coverage Visualization: Coverage Gutters integration

Architecture

Laborious uses a Temporal-based architecture with strong separation of concerns and defensive error handling for production ML.

Architecture Principles

1. Separation of Concerns

• Worker Layer: Temporal workers, task queues, lifecycle
• Workflow Layer: Business orchestration and coordination
• Activity Layer: External system interactions and isolated operations
• Data Layer: Persistence, caching, connectors

2. Fault Tolerance & Resilience

• Automatic Retry Policies for transient failures
• Graceful Degradation and circuit breaking for dependencies
• Detailed Error Handling with notifications

3. Scalability & Performance

• Horizontal Scaling: Multiple worker instances for load distribution
• Task Queue Isolation: Separate queues for different workflow types
• Connection Pooling: Optimized database and external service connections
• Asynchronous Processing: Non-blocking operations for improved throughput

4. Observability & Monitoring

• Prometheus Metrics: Comprehensive system and business metrics
• Structured Logging: Consistent log format with correlation IDs
• Health Checks: Endpoint health monitoring and alerting
• Performance Tracing: Request flow tracking and bottleneck identification

Key Components

Worker (laborious/worker/worker.py)

• Temporal client setup, worker lifecycle, task queues
• Metrics server initialization, notification handler setup
• Graceful shutdown and autoscaling-friendly behavior

Workflows (laborious/workflows/)

• predictions_batch.py: Batch prediction entry point
• sub_workflows/prediction_process.py: Core prediction pipeline
• sub_workflows/format_and_export_prediction.py: Formatting and export
• minimal_retrain.py: Automated model retraining and production update

Activities (laborious/activities/)

• gates.py: Data quality validation and filtering
• mlflow.py: Transform and predict operations
• opc.py: OPC UA export to industrial systems (optional)
• activities.py: Aggregates activity interfaces

Data Services (laborious/utils/)

• connectors_config.py: Env-driven configuration builders
• repository/model_repository.py: MLFlow operations and retraining
• repository/opc_repository.py: OPC communication and writes
• filters/conditional_filters.py and filters/mlflow_filters.py

Data Flow Architecture

1. Batch Prediction Pipeline

Input Data (PostgreSQL) → Data Quality Gates → MLFlow Transform →
MLFlow Prediction → Response Validation → Export (PostgreSQL [+ OPC])

2. Model Retraining Pipeline

Training Data → Model Retraining → Quality Validation →
Production Update → Notification & Monitoring

Security Architecture

Authentication & Authorization

• MLFlow API Authentication: Username/password
• Database Security: Encrypted connections and credential management
• OPC Certificates (if enabled): Client/server certs
• Kubernetes Secrets: Secure secret storage

Network Security

• TLS/SSL, network policies, service mesh, firewalls, VPN

Data Security

• At-rest/in-transit encryption, RBAC, audit logging, lifecycle management

Workflows

1. Predictions Batch Workflow (predictions_batch.py)

The PredictionsBatch workflow is the main entry point for batch prediction pipelines. It orchestrates the complete prediction process and implements a robust data loading and processing pattern.

Purpose

• Batch Prediction Orchestration: Coordinates data loading and prediction processing
• Data Preparation: Loads data using custom SQL queries with configurable schemas
• Workflow Delegation: Delegates actual prediction processing to the PredictionProcess workflow
• Configuration Management: Handles model configuration, filters, and retention policies

Execution Flow

1. Data Loading: Executes custom SQL query to load data from PostgreSQL
2. Input Preparation: Prepares prediction input with metadata and configuration
3. Workflow Delegation: Spawns PredictionProcess child workflow for actual processing
4. Error Handling: Implements comprehensive error handling with retry policies

Key Features

• Custom Query Support: Flexible SQL-based data loading
• Schema Configuration: Configurable data schema definitions
• Automatic Retry: Implements Temporal retry policies for fault tolerance
• Timeout Management: 60-second timeout for all activities
• Comprehensive Error Handling: Detailed error reporting and notification integration

Input Parameters

{
  "schedule_name": "hourly_predictions",
  "model_name": "temperature_prediction_model",
  "model_id": "temp_pred_001",
  "query": "SELECT * FROM sensor_data WHERE timestamp > NOW() - INTERVAL '1 hour'",
  "schema": {
    "timestamp": "datetime",
    "temperature": "float",
    "humidity": "float"
  },
  "table_name": "predictions",
  "input_filters": {
    "EMPTY_DATA": {"POLICY": "STOP"}
  },
  "mlflow_transform_filters": {
    "API_ERROR": {"POLICY": "STOP"}
  },
  "mlflow_predict_filters": {
    "API_ERROR": {"POLICY": "STOP"}
  },
  "model_retention": 60,
  "path_priority": ["STOP", "CONTINUE", "REPEAT"],
  "opc_output_config": {
    "server_id": "opc_server_1",
    "tags": ["prediction_output"]
  }
}

Architecture Diagram

flowchart LR
    A[1. load_custom_query] --> B[2. prediction_process 🔃]
    
    A -.-> Database[(Database)]

2. Prediction Process Workflow (prediction_process.py)

The PredictionProcess workflow implements the core prediction pipeline for ML model inference. It handles data quality validation, MLFlow model interactions, and prediction processing.

Purpose

• Data Quality Validation: Applies configurable filters for data integrity
• MLFlow Integration: Manages model transformation and prediction requests
• Response Validation: Filters MLFlow API responses for quality assurance
• Prediction Export: Delegates prediction formatting and export operations

Execution Flow

1. Timestamp Retrieval: Gets the last processed timestamp for incremental processing
2. Input Data Gate: Applies configured filters for data quality validation
3. Path Decision: Determines processing path based on filter results
4. MLFlow Transform: Requests data transformation using MLFlow models
5. Response Validation: Filters transform responses for quality assurance
6. MLFlow Prediction: Executes prediction using transformed data
7. Content Validation: Filters prediction responses for final quality check
8. Export Delegation: Delegates to FormatAndExportPrediction workflow

Key Features

• Configurable Quality Gates: Multiple filter types with policy-based configuration
• Flexible Path Handling: Configurable decision paths (STOP, CONTINUE, REPEAT)
• MLFlow Integration: Comprehensive model management and inference
• Incremental Processing: Timestamp-based data processing optimization
• Comprehensive Monitoring: Detailed metrics and error reporting

Input Parameters

{
  "metadata": {
    "schedule_name": "hourly_predictions",
    "model_name": "temperature_prediction_model",
    "model_id": "temp_pred_001",
    "workflow_name": "predictions_batch"
  },
  "data": {...},
  "schema": {...},
  "table_name": "predictions",
  "model_id": "temp_pred_001",
  "model_name": "temperature_prediction_model",
  "input_filters": {
    "EMPTY_DATA": {"POLICY": "STOP"},
    "SPECIFIC_VARIABLES_NULL_VALUES": {
      "POLICY": "STOP",
      "config": {"variables": ["temperature", "humidity"]}
    }
  },
  "mlflow_transform_filters": {
    "API_ERROR": {"POLICY": "STOP"}
  },
  "mlflow_predict_filters": {
    "API_ERROR": {"POLICY": "STOP"},
    "NAN_VALUES": {"POLICY": "STOP"}
  },
  "model_retention": 60,
  "path_priority": ["STOP", "CONTINUE", "REPEAT"],
  "opc_output_config": {...}
}

Architecture Diagram

flowchart LR
    A[1. get_last_timestamp] --> B[2. input_gate] --> C[3. request_transform] --> D[4. mlflow_response_gate] --> E[5. mlflow_content_gate] --> F[6. request_predict] --> G[7. mlflow_response_gate] --> H[8. format_and_export_prediction🔃]
    
    A -.-> Redis[(Redis)]
    C -.-> MLFlow[MLFlow]
    F -.-> MLFlow[MLFlow]
    G -.-> Filters[MLFlow Filters]

3. Format and Export Prediction Workflow (format_and_export_prediction.py)

The FormatAndExportPrediction workflow handles prediction data formatting and export operations to multiple destinations.

Purpose

• Data Formatting: Formats prediction data for different output destinations
• PostgreSQL Export: Persists predictions to database with metrics
• OPC Integration: Writes predictions to OPC servers for real-time access
• Metrics Recording: Tracks export operations and performance metrics

Execution Flow

1. Path Decision: Determines formatting path based on configuration
2. Data Formatting: Formats prediction data for specific output requirements
3. PostgreSQL Export: Writes formatted predictions to database
4. OPC Export: Writes predictions to OPC servers
5. Metrics Recording: Records export performance and success metrics

Key Features

• Flexible Formatting: Configurable output formats for different destinations
• Multi-Destination Export: PostgreSQL and OPC server integration
• Performance Monitoring: Comprehensive metrics for export operations
• Error Handling: Robust error handling with notification integration

Architecture Diagram

flowchart LR
    A[1. format_prediction/format_default_prediction] --> B[2. write_opc_data] --> C[3. export_data_to_postgres] --> D[4. write_metrics]
    
    A -.-> Format[Data Formatting]
    B -.-> OPC[OPC Servers]
    C -.-> PostgreSQL[(PostgreSQL)]
    D -.-> Prometheus[Prometheus]

4. Minimal Retrain Workflow (minimal_retrain.py)

The MinimalRetrain workflow handles automated model retraining and production model updates.

Purpose

• Model Retraining: Automates ML model retraining processes
• Production Updates: Manages production model version updates
• Data Export: Exports training data for model development
• Quality Assurance: Ensures model quality before production deployment

Execution Flow

1. Data Loading: Loads training data using custom queries
2. Model Retraining: Executes model retraining process
3. Quality Validation: Validates retrained model performance
4. Production Update: Updates production model if quality criteria met
5. Data Export: Exports training data for analysis

Architecture Diagram

flowchart LR
    A[1. load_custom_query] --> B[2. retrain_model] --> C[3. update_production_model] --> D[4. export_data_to_postgres]
    
    A -.-> Database[(Database)]
    B -.-> MLFlow[MLFlow]
    C -.-> MLFlow[MLFlow]
    D -.-> PostgreSQL[(PostgreSQL)]

📋 Prerequisites

• Python 3.11+
• Temporal server/cluster
• PostgreSQL database
• MLFlow server
• MinIO object storage (for MLFlow artifacts)
• MongoDB server (for notifications)
• OPC server(s) if using OPC export

Note: External dependencies must be available either through:

• Kubernetes cluster deployment
• Docker Compose setup
• Cloud-managed services
• Local installations

🚀 Installation

Local Development Setup

1. Clone the repository

   git clone <repository-url>
   cd sientia-dataops-laborious
   

2. Create virtual environment

   python3.11 -m venv venv
   source ./venv/bin/activate
   

3. Install dependencies

4. Install github cli bash sudo apt update sudo apt install gh -y

5. Authenticate with github bash gh auth login

6. Run the install_dependencies.sh script bash chmod +x install_dependencies.sh ./install_dependencies.sh

7. Create environment configuration file

   cp .env.example .env
   # Edit .env with your connection details
   

8. Configure external dependencies

   You'll need to set up port forwarding or connections to external services. For example:

   # Port forwarding from Kubernetes cluster
   kubectl port-forward svc/postgresql 5432:5432
   kubectl port-forward svc/mlflow 5000:5000
   kubectl port-forward svc/mongodb 27017:27017
   
   # Or connect to external services
   # Ensure services are accessible on localhost with appropriate ports
   

📦 How to Run

Running the Laborious Application

Use the provided script to run the application locally:

# Make script executable (first time only)
chmod +x run_local.sh

# Run the application
./run_local.sh

The script will:

• Activate the virtual environment
• Load environment variables from .env
• Start the laborious worker application

Running Tests and Coverage

Use the provided script to run tests with coverage:

# Make script executable (first time only)
chmod +x run_coverage.sh

# Run tests with coverage
./run_coverage.sh

The script will:

• Activate the virtual environment
• Run pytest with coverage reporting
• Generate HTML coverage report
• Open the coverage report in your browser

Manual Test Execution

You can also run tests manually:

# Activate virtual environment
source ./venv/bin/activate

# Run all tests
pytest

# Run with coverage
pytest --cov=laborious --cov-report=html

# Run specific test categories
pytest tests/activities/
pytest tests/workflow/

Manual Application Execution

For manual execution without scripts:

# Activate virtual environment
source ./venv/bin/activate

# Load environment variables (if using .env file)
if [ -f .env ]; then
    export $(cat .env | grep -v '^#' | xargs)
fi

# Start the laborious worker
python -m laborious.worker.worker

Code Quality & Validation

Overview

Since Python is not compiled, we validate quality, security, and correctness before execution.

Validation Tools

• Ruff: Linting and formatting
• mypy: Static type checking
• Bandit: Security analysis
• pytest: Unit/integration testing with coverage

Tools Installation

pip install -r requirements-dev.txt

Complete Validation

Option 1 (recommended):

./validate.sh

The script runs, in order:

1. Format check (Ruff)
2. Linting (Ruff)
3. Type checking (mypy)
4. Security analysis (Bandit)
5. Tests with coverage (pytest)

Option 2 (individual commands):

ruff format --check laborious/ tests/
ruff check laborious/ tests/
mypy laborious/
bandit -r laborious/ -ll
pytest tests/ --cov=laborious --cov-report=term-missing

Automatic Fixes

ruff format laborious/ tests/
ruff check --fix laborious/ tests/

Configuration

All settings reside in pyproject.toml (Ruff, mypy, pytest, Bandit).

CI/CD Integration

The workflow at .github/workflows/quality-gate.yml executes validations on each push/PR.

Best Practices

• Run ./validate.sh before committing
• Use ruff check --watch for continuous feedback
• Add type hints and tests for new code

🧪 Testing

Test Structure

tests/
├── activities/           # Activity implementation tests
├── workflow/            # Workflow orchestration tests
├── utils/               # Utility function tests
└── integration/         # End-to-end workflow tests

Test Execution

# Install test dependencies
pip install pytest pytest-cov pytest-asyncio

# Run tests with coverage
pytest --cov=laborious --cov-report=html

# Run specific test modules
pytest tests/activities/test_gates.py
pytest tests/workflow/test_predictions_batch.py

📊 Monitoring and Metrics

The Laborious system exposes comprehensive Prometheus metrics for operational visibility and performance monitoring:

Application Health Metrics

• app_up: Application health status (1=healthy, 0=unhealthy)
  • Labels: pod_id

Prediction Operation Metrics

• laborious_predictions_written_count: Counter for successful prediction exports
  • Labels: pod_id, model_name, pipeline_name
• laborious_prediction_confidence_monitor: Gauge for current prediction confidence levels
  • Labels: pod_id, model_name, pipeline_name
• laborious_prediction_response_time_monitor: Histogram for prediction response times
  • Labels: pod_id, model_name, pipeline_name
  • Buckets: [0.01, 0.05, 0.1, 0.2, 0.5, 1.0, 2.0, 5.0, 10.0]

OPC Export Metrics

• laborious_prediction_opc_writing_count: Counter for OPC server write operations
  • Labels: pod_id, model_name, pipeline_name, opc_server_id
• laborious_prediction_opc_writing_response_time_monitor: Histogram for OPC write response times
  • Labels: pod_id, model_name, pipeline_name, opc_server_id
  • Buckets: [0.01, 0.05, 0.1, 0.2, 0.5, 1.0, 2.0, 5.0, 10.0]

Data Quality Metrics

• Filter pass/fail rates through notification system
• MLFlow API response validation metrics
• Data quality gate performance tracking

⚙️ Configuration

Environment Variables

Variable	Description	Default	Required
TEMPORAL_HOST	Temporal server address	localhost:7233	Yes
TEMPORAL_NAMESPACE	Temporal namespace	laborious	No
POSTGRES_HOST	PostgreSQL hostname	localhost	Yes
POSTGRES_PORT	PostgreSQL port	5432	Yes
POSTGRES_USER	PostgreSQL username	sientia	Yes
POSTGRES_PASSWORD	PostgreSQL password	sientia	Yes
POSTGRES_DBNAME	PostgreSQL database	sientia	Yes
POSTGRES_MIN_CONNECTIONS	Minimum PostgreSQL connections	5	No
POSTGRES_MAX_CONNECTIONS	Maximum PostgreSQL connections	20	No
MLFLOW_HOST	MLFlow server hostname	http://localhost	Yes
MLFLOW_PORT	MLFlow server port	5080	Yes
MLFLOW_USERNAME	MLFlow username	aignosi	Yes
MLFLOW_PASSWORD	MLFlow password	aignosi	Yes
OPC_CONFIG	OPC server configuration (JSON)	{}	No
OPC_ID	OPC server identifier	1	No
OPC_URL	OPC server URL	opc.tcp://localhost:4840	No
OPC_SERVER_URI	OPC server URI	opc.tcp://localhost:4840	No
OPC_CERT_PATH	OPC client certificate path	None	No
OPC_PRIVATE_KEY_PATH	OPC private key path	None	No
OPC_SERVER_CERT_PATH	OPC server certificate path	None	No
OPC_RECONNECTION_INTERVAL	OPC reconnection interval (ms)	120	No
MONGODB_URL	MongoDB connection URI	localhost:27018	Yes
MONGODB_USERNAME	MongoDB username	root	Yes
MONGODB_PASSWORD	MongoDB password	wKZDbMNU1c	Yes
MONGODB_DATABASE_NAME	MongoDB database name	sientia	Yes
MONGODB_TTL_INDEX_HOURS	MongoDB TTL index hours	1	No
LOG_LEVEL	Application log level	INFO	No
PROJECT_NAME	Project name for metrics	laborious	No
HTTP_METRICS_PORT	Prometheus metrics port	9090	No
HTTP_SDK_METRICS_PORT	Temporal SDK metrics port	9091	No
POD_ID	Kubernetes pod identifier	None	No

OPC Configuration

For multiple OPC servers, use the OPC_CONFIG environment variable:

{
  "opc_server_1": {
    "url": "opc.tcp://server1:4840",
    "name": "Server1",
    "server_uri": "urn:server1:opcua",
    "cert_path": "/path/to/cert.pem",
    "private_key_path": "/path/to/key.pem",
    "server_cert_path": "/path/to/server_cert.pem",
    "reconnection_interval": 5000
  },
  "opc_server_2": {
    "url": "opc.tcp://server2:4840",
    "name": "Server2",
    "server_uri": "urn:server2:opcua",
    "cert_path": "/path/to/cert.pem",
    "private_key_path": "/path/to/key.pem",
    "server_cert_path": "/path/to/server_cert.pem",
    "reconnection_interval": 5000
  }
}

For single OPC server, use individual environment variables:

• OPC_URL
• OPC_NAME
• OPC_SERVER_URI
• OPC_CERT_PATH
• OPC_PRIVATE_KEY_PATH
• OPC_SERVER_CERT_PATH
• OPC_RECONNECTION_INTERVAL

Workflow Configuration

MongoDB pipeline configuration:

Predictions Batch Workflow configuration sample

This is the configuration for the Predictions Batch Workflow, to be inserted into the MongoDB pipeline collection.

{
  "schedule_name": "laborious-orchestrated-pipeline",
  "model_id": "1",
  "workflow_type": "predictions_batch",
  "frequency": "30s",
  "max_retry_policy": 1,
  "query": "select * from sientia_data.laborious_data where model_id = 1 and \"timestamp\" > NOW() - INTERVAL '5 minutes' order by \"timestamp\" desc limit 30;",
  "write_tags": [
    {
      "server_id": "server1",
      "type": "prediction",
      "addr": "ns=2;i=5",
      "data_type": "double"
    },
    {
      "server_id": "server1",
      "type": "confidence",
      "addr": "ns=2;i=6",
      "data_type": "double"
    }
  ],
  "input_filters": {
    "EMPTY_DATA": {"POLICY": "STOP"},
    "SPECIFIC_VARIABLES_NULL_VALUES": {
      "POLICY": "CONTINUE",
      "config": {"variables": ["Counter"]}
    }
  },
  "mlflow_transform_filters": {
    "API_ERROR": {"POLICY": "REPEAT"},
    "NAN_VALUES": {"POLICY": "STOP"}
  },
  "mlflow_predict_filters": {
    "API_ERROR": {"POLICY": "CONTINUE"}
  },
  "path_priority": ["STOP", "CONTINUE", "REPEAT"],
  "active": true,
  "updated_at": {
    "$date": "2025-09-16T10:00:00.000Z"
  },
  "datetime_columns": ["timestamp", "created_at"],
  "predictions_storage_policy": "lts:1"
}

This is the configuration created by the Orchestrator in Temporal.

{
  "datetime_columns":["timestamp","created_at"],
  "frequency":"15m",
  "input_filters":{"EMPTY_DATA":{"config":{},"policy":"STOP"}},
  "max_retry_policy":1,
  "mlflow_predict_filters":{"API_ERROR":{"config":{},"policy":"CONTINUE"}},
  "mlflow_transform_filters":{
    "API_ERROR":{"config":{},"policy":"CONTINUE"},
    "EMPTY_DATA":{"config":{},"policy":"STOP"}
  },
  "model_config":{
    "is_compressed":true,
    "predict_flavor":"pyfunc",
    "retention_minutes":60,
    "retention_target":"artifact",
    "transform_function_keyword":"transform"
  },
  "model_id":"352",
  "model_name":"courier",
  "opc_output_config":{},
  "path_priority":["STOP","CONTINUE","REPEAT"],
  "predictions_storage_policy":"lts:1",
  "query":"select * from sientia_data.laborious_data where model_id = 352 order by \"timestamp\" desc limit 300;",
  "retention_time":3600,
  "schedule_name":"laborious-courier",
  "schema":"sientia_data",
  "table_name":"predictions",
  "updated_at":"2025-09-12 19:35:01.600000+0000",
  "workflow_type":"predictions_batch"
}

🔧 Development

Project Structure

laborious/
├── activities/              # Temporal activity implementations
│   ├── activities.py       # Main activities orchestrator
│   ├── gates.py            # Data quality gates and filtering
│   ├── mlflow.py           # MLFlow model operations
│   └── opc.py              # OPC server operations
├── workflows/               # Temporal workflow definitions
│   ├── predictions_batch.py # Main batch prediction workflow
│   ├── minimal_retrain.py  # Model retraining workflow
│   └── sub_workflows/      # Sub-workflow implementations
│       ├── prediction_process.py # Core prediction workflow
│       └── format_and_export_prediction.py # Export workflow
├── worker/                  # Worker implementation
│   └── worker.py           # Main worker orchestrator
├── utils/                   # Utility functions
│   ├── connectors_config.py # Database configuration
│   ├── filters/            # Data quality filters
│   │   ├── conditional_filters.py # Conditional data filters
│   │   └── mlflow_filters.py # MLFlow response filters
│   └── repository/         # Data access layer
│       ├── model_repository.py # MLFlow model operations
│       └── opc_repository.py # OPC server operations
├── metrics.py               # Prometheus metrics definitions
└── __init__.py

Adding New Features

1. Follow Temporal patterns for new workflows and activities
2. Add comprehensive docstrings for all public methods
3. Include Prometheus metrics for monitoring
4. Add unit tests for new functionality
5. Update this README with new features and configuration

🐛 Troubleshooting

Common Issues

1. Temporal Connection Failures

   • Verify Temporal server is running and accessible
   • Check namespace configuration and permissions
   • Review server logs for connection issues

2. MLFlow Connection Issues

   • Verify MLFlow server is running and accessible
   • Check authentication credentials and permissions
   • Ensure model names and versions exist

3. Database Connection Issues

   • Verify PostgreSQL service is running
   • Check connection credentials and network access
   • Ensure proper connection pool configuration

4. OPC Connection Failures

   • Verify OPC server is accessible
   • Check certificate and key file paths
   • Review OPC server logs for connection issues

5. Workflow Execution Failures

   • Review activity error logs and notifications
   • Check data quality filter configurations
   • Verify input data format and required fields

Debug Mode

Enable debug logging by setting the log level:

export LOG_LEVEL=DEBUG

⚡ Performance Tuning

Key Parameters

• Worker Concurrency: Adjust max_concurrent_workflow_tasks and max_concurrent_activities
• Connection Pools: Optimize database connection pool sizes
• Model Retention: Configure MLFlow model retention based on requirements
• Batch Sizes: Adjust data processing batch sizes for optimal throughput

Scaling Considerations

• Horizontal Scaling: Deploy multiple worker instances
• Task Queue Distribution: Use multiple task queues for different workflow types
• Database Performance: Optimize indexes and connection pooling
• MLFlow Performance: Configure appropriate model serving resources

🤝 Contributing

1. Fork the repository
2. Create a feature branch
3. Make your changes with comprehensive testing
4. Update documentation and docstrings
5. Submit a pull request

Code Quality Standards

• Follow PEP 8 style guidelines
• Include comprehensive docstrings for all public methods
• Maintain test coverage above 80%
• Use type hints where appropriate
• Follow Temporal.io best practices

📄 License

This project is licensed under the terms specified in the LICENSE file.

🆘 Support

For support and questions:

• Check the troubleshooting section above
• Review the metrics and logs for error patterns
• Open an issue in the project repository
• Contact the development team

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Note: The Laborious system is designed for production use in industrial ML environments. Ensure proper security configuration and network isolation for production deployments.