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This commit configures Prometheus to accept historic data via the Remote
Write API, enabling backfilling of test metrics for development and
troubleshooting purposes.
Changes:
- Enable Remote Write receiver (--web.enable-remote-write-receiver)
- Enable out-of-order ingestion with 30-day window (720h)
- Enable exemplar-storage and otlp-write-receiver features
- Add Epimetheus dashboard ConfigMap for Grafana provisioning
- Remove old prometheus-pusher directory (moved to separate repo)
- Document configuration, use cases, and performance considerations
Configuration allows backfilling data up to 30 days in the past, supporting
tools like Epimetheus for generating synthetic historic metrics.
Performance note: This is optimized for ad-hoc troubleshooting, not
production use. Out-of-order ingestion increases memory usage, TSDB overhead,
and may impact query performance.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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Implemented unit tests across all internal packages to achieve
63.9% test coverage, exceeding the 60% target.
Test coverage by package:
- internal/config: 100.0% (config validation, constants)
- internal/metrics: 100.0% (Sample methods, Collectors, Simulate)
- internal/parser: 92.3% (CSV/JSON parsing, format detection)
- internal/ingester: 44.9% (auto routing, time series conversion)
New test files:
- internal/config/config_test.go: Config creation and constants
- internal/metrics/sample_test.go: Sample type methods (Age, IsRecent)
- internal/metrics/generator_test.go: Collectors and simulation
- internal/parser/csv_test.go: CSV parsing with various inputs
- internal/parser/json_test.go: JSON parsing and validation
- internal/parser/parser_test.go: Parser factory and format handling
- internal/ingester/auto_test.go: Auto mode routing logic
- internal/ingester/remotewrite_test.go: Time series conversion
- internal/ingester/pushgateway_test.go: Pushgateway ingester
Tests cover:
- Happy path and error cases
- Context cancellation support
- Edge cases (empty input, invalid formats)
- Label parsing and timestamp handling
- Metric type generation (counter, gauge, histogram)
- Table-driven tests for comprehensive coverage
All 50+ tests passing ✅
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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Major refactoring to improve code organization and follow Go conventions:
- Moved main entry point to cmd/prometheus-pusher/main.go
- Organized code into internal packages (config, metrics, parser, ingester, version)
- Implemented proper dependency injection (no package-level variables)
- Added context.Context to all blocking operations
- Used value semantics where feasible (Sample, Config, Ingesters)
- Proper error wrapping with %w throughout
- All functions under 50 lines, focused and single-purpose
- Consistent ordering: constants, types, constructors, public, private
- Added -version flag to display version from internal/version package
Package structure:
- cmd/prometheus-pusher: Main entry point with flag parsing and mode routing
- internal/config: Configuration types and constants
- internal/version: Version constant (0.0.0)
- internal/metrics: Sample type and Collectors for metric generation
- internal/parser: CSV/JSON parsers with context support
- internal/ingester: Pushgateway, RemoteWrite, and Auto ingesters
All modes tested and working: realtime, historic, backfill, auto
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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