Enable Prometheus historic data ingestion with out-of-order support

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>

1 files changed, 0 insertions, 99 deletions

diff --git a/f3s/prometheus-pusher/internal/parser/parser_test.go b/f3s/prometheus-pusher/internal/parser/parser_test.go
deleted file mode 100644
index 05255a5..0000000
--- a/f3s/prometheus-pusher/internal/parser/parser_test.go
+++ /dev/null
@@ -1,99 +0,0 @@
-package parser
-
-import (
-	"context"
-	"strings"
-	"testing"
-)
-
-func TestParseFile_CSV(t *testing.T) {
-	// We can't easily test file operations without creating temp files
-	// So we'll test the error case
-	ctx := context.Background()
-	_, err := ParseFile(ctx, "/nonexistent/file.csv", "csv")
-
-	if err == nil {
-		t.Error("Expected error for nonexistent file")
-	}
-}
-
-func TestParseWithFormat_CSV(t *testing.T) {
-	ctx := context.Background()
-	input := `test_metric,env=prod,100,1234567890000`
-	reader := strings.NewReader(input)
-
-	samples, err := parseWithFormat(ctx, reader, "csv")
-	if err != nil {
-		t.Fatalf("parseWithFormat(csv) error = %v", err)
-	}
-	if len(samples) != 1 {
-		t.Errorf("Expected 1 sample, got %d", len(samples))
-	}
-}
-
-func TestParseWithFormat_JSON(t *testing.T) {
-	ctx := context.Background()
-	input := `[{"metric": "test_metric", "value": 100, "timestamp_ms": 1234567890000}]`
-	reader := strings.NewReader(input)
-
-	samples, err := parseWithFormat(ctx, reader, "json")
-	if err != nil {
-		t.Fatalf("parseWithFormat(json) error = %v", err)
-	}
-	if len(samples) != 1 {
-		t.Errorf("Expected 1 sample, got %d", len(samples))
-	}
-}
-
-func TestParseWithFormat_UnsupportedFormat(t *testing.T) {
-	ctx := context.Background()
-	reader := strings.NewReader("")
-
-	_, err := parseWithFormat(ctx, reader, "xml")
-	if err == nil {
-		t.Error("Expected error for unsupported format")
-	}
-	if err.Error() != "unsupported format: xml (use csv or json)" {
-		t.Errorf("Unexpected error message: %v", err)
-	}
-}
-
-func TestParseWithFormat_EmptyResult(t *testing.T) {
-	ctx := context.Background()
-	input := `[]` // Empty JSON array
-	reader := strings.NewReader(input)
-
-	_, err := parseWithFormat(ctx, reader, "json")
-	if err == nil {
-		t.Error("Expected error for empty samples")
-	}
-	if err.Error() != "no valid samples found" {
-		t.Errorf("Expected 'no valid samples found' error, got: %v", err)
-	}
-}
-
-func TestParseStdin_Format(t *testing.T) {
-	// We can't easily test stdin without mocking,
-	// but we can verify the error path
-	ctx := context.Background()
-
-	// Test with invalid format
-	_, err := parseWithFormat(ctx, strings.NewReader(""), "invalid_format")
-	if err == nil {
-		t.Error("Expected error for invalid format")
-	}
-}
-
-func TestNewCSVParser(t *testing.T) {
-	parser := NewCSVParser()
-	if parser == nil {
-		t.Error("NewCSVParser() returned nil")
-	}
-}
-
-func TestNewJSONParser(t *testing.T) {
-	parser := NewJSONParser()
-	if parser == nil {
-		t.Error("NewJSONParser() returned nil")
-	}
-}