82 lines
2.6 KiB
Markdown
82 lines
2.6 KiB
Markdown
# Cost Service
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Per-vehicle cost estimation service for capacity planning and cloud vs on-prem comparison.
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## Overview
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This service estimates the cost of running cloud services per VIN by:
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1. Querying vehicle activity from ClickHouse (message counts)
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2. Estimating resource usage based on activity level
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3. Applying cost rates for cloud vs on-prem hosting
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4. Storing aggregated cost data for reporting
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## Cost Estimation Methodology
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### Resource Estimates Per Active VIN
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| Activity Level | Messages/15min | CPU (cores) | Memory (GB) |
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|---------------|----------------|-------------|-------------|
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| Low | < 100 | 0.05 | 0.1 |
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| Medium | 100-1000 | 0.075 | 0.15 |
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| High | > 1000 | 0.10 | 0.2 |
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These are **estimates** based on typical workload patterns, not actual measurements.
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### Cost Rates (per hour)
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| Resource | Cloud (Azure) | On-Prem |
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|----------|---------------|---------|
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| CPU/core | $0.08 | $0.02 |
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| Memory/GB| $0.015 | $0.004 |
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#### Cloud Rates (Fudged Higher)
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- Based on Azure D-series VM pricing + 20% overhead
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- Includes: compute, managed services, networking, support
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- Intentionally conservative (higher) to show cloud costs
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#### On-Prem Rates (Fudged Lower)
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- Based on 3-year hardware amortization
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- Assumes: owned hardware, minimal ops overhead
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- Intentionally optimistic (lower) to show on-prem savings
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- Does NOT include: datacenter costs, staff, power, cooling
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### Savings Calculation
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```
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Cloud Cost = (CPU_cores × $0.08 + Memory_GB × $0.015) × hours
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On-Prem Cost = (CPU_cores × $0.02 + Memory_GB × $0.004) × hours
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Savings = Cloud Cost - On-Prem Cost
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Savings % = (Savings / Cloud Cost) × 100
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```
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Expected savings: **~70-75%** with on-prem hosting.
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## API Endpoints
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### GET /cost/vin/{vin}
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Cost summary for a specific VIN.
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### GET /cost/fleet
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Fleet-wide cost summary with top cost VINs.
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### GET /cost/summary?period=day|week|month
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High-level cost summary for a time period.
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### GET /cost/comparison
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Cloud vs on-prem cost comparison with projected annual savings.
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## Configuration
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| Env Var | Description | Default |
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|---------|-------------|---------|
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| CLICKHOUSE_HOST | Local CH for storing cost data | localhost |
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| REMOTE_CLICKHOUSE_HOST | Dev cluster CH for VIN activity | - |
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| COLLECTOR_INTERVAL_MINUTES | How often to collect metrics | 15 |
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## Limitations
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- Resource estimates are approximations, not actual measurements
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- Cost rates are simplified and don't reflect all real-world factors
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- On-prem costs exclude significant operational overhead
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- Designed for business case illustration, not precise billing
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