Repository: prometheus/prometheus
File: cmd/prometheus/main.go (Go)

Code before:

	serverOnlyFlag(a, "storage.tsdb.allow-overlapping-compaction", "Allow compaction of overlapping blocks. If set to false, TSDB stops vertical compaction and leaves overlapping blocks there. The use case is to let another component handle the compaction of overlapping blocks.").
		Default("true").Hidden().BoolVar(&cfg.tsdb.EnableOverlappingCompaction)

	var (
		tsdbWALCompression     bool
		tsdbWALCompressionType string
		tsdbUploadMetaPath     string
	)
	serverOnlyFlag(a, "storage.tsdb.wal-compression", "Compress the tsdb WAL. If false, the --storage.tsdb.wal-compression-type flag is ignored.").
		Hidden().Default("true").BoolVar(&tsdbWALCompression)

	serverOnlyFlag(a, "storage.tsdb.wal-compression-type", "Compression algorithm for the tsdb WAL, used when --storage.tsdb.wal-compression is true.").
		Hidden().Default(compression.Snappy).EnumVar(&tsdbWALCompressionType, compression.Snappy, compression.Zstd)

	serverOnlyFlag(a, "storage.tsdb.head-chunks-write-queue-size", "Size of the queue through which head chunks are written to the disk to be m-mapped, 0 disables the queue completely. Experimental.").
		Default("0").IntVar(&cfg.tsdb.HeadChunksWriteQueueSize)

	serverOnlyFlag(a, "storage.tsdb.samples-per-chunk", "Target number of samples per chunk.").
		Default("120").Hidden().IntVar(&cfg.tsdb.SamplesPerChunk)

	serverOnlyFlag(a, "storage.tsdb.delayed-compaction.max-percent", "Sets the upper limit for the random compaction delay, specified as a percentage of the head chunk range. 100 means the compaction can be delayed by up to the entire head chunk range. Only effective when the delayed-compaction feature flag is enabled.").
		Default("10").Hidden().IntVar(&cfg.tsdb.CompactionDelayMaxPercent)

	serverOnlyFlag(a, "storage.tsdb.upload-meta-file", "Path to a JSON file with uploaded TSDB blocks e.g. Thanos shipper meta file. If set TSDB will only compact blocks that are marked as uploaded in that file, improving external storage integrations e.g. with Thanos sidecar").
		Default("").StringVar(&tsdbUploadMetaPath)

	agentOnlyFlag(a, "storage.agent.path", "Base path for metrics storage.").
		Default("data-agent/").StringVar(&cfg.agentStoragePath)

	agentOnlyFlag(a, "storage.agent.wal-segment-size",
		"Size at which to split WAL segment files. Example: 100MB").
		Hidden().PlaceHolder("<bytes>").BytesVar(&cfg.agent.WALSegmentSize)

	var (
		agentWALCompression     bool
		agentWALCompressionType string
	)
	agentOnlyFlag(a, "storage.agent.wal-compression", "Compress the agent WAL. If false, the --storage.agent.wal-compression-type flag is ignored.").
		Default("true").BoolVar(&agentWALCompression)

	agentOnlyFlag(a, "storage.agent.wal-compression-type", "Compression algorithm for the agent WAL, used when --storage.agent.wal-compression is true.").
		Hidden().Default(compression.Snappy).EnumVar(&agentWALCompressionType, compression.Snappy, compression.Zstd)

	agentOnlyFlag(a, "storage.agent.wal-truncate-frequency",
		"The frequency at which to truncate the WAL and remove old data.").
		Hidden().PlaceHolder("<duration>").SetValue(&cfg.agent.TruncateFrequency)

	agentOnlyFlag(a, "storage.agent.retention.min-time",
		"Minimum age samples may be before being considered for deletion when the WAL is truncated").
		SetValue(&cfg.agent.MinWALTime)

Review comment (suggestion):
```suggestion
		Default("").StringVar(&tsdbDelayCompactFilePath)
```

Code after:
	var (
		tsdbWALCompression       bool
		tsdbWALCompressionType   string
		tsdbDelayCompactFilePath string
	)
	serverOnlyFlag(a, "storage.tsdb.wal-compression", "Compress the tsdb WAL. If false, the --storage.tsdb.wal-compression-type flag is ignored.").
		Hidden().Default("true").BoolVar(&tsdbWALCompression)

	serverOnlyFlag(a, "storage.tsdb.wal-compression-type", "Compression algorithm for the tsdb WAL, used when --storage.tsdb.wal-compression is true.").
		Hidden().Default(compression.Snappy).EnumVar(&tsdbWALCompressionType, compression.Snappy, compression.Zstd)

	serverOnlyFlag(a, "storage.tsdb.head-chunks-write-queue-size", "Size of the queue through which head chunks are written to the disk to be m-mapped, 0 disables the queue completely. Experimental.").
		Default("0").IntVar(&cfg.tsdb.HeadChunksWriteQueueSize)

	serverOnlyFlag(a, "storage.tsdb.samples-per-chunk", "Target number of samples per chunk.").
		Default("120").Hidden().IntVar(&cfg.tsdb.SamplesPerChunk)

	serverOnlyFlag(a, "storage.tsdb.delayed-compaction.max-percent", "Sets the upper limit for the random compaction delay, specified as a percentage of the head chunk range. 100 means the compaction can be delayed by up to the entire head chunk range. Only effective when the delayed-compaction feature flag is enabled.").
		Default("10").Hidden().IntVar(&cfg.tsdb.CompactionDelayMaxPercent)

	serverOnlyFlag(a, "storage.tsdb.delay-compact-file.path", "Path to a JSON file with uploaded TSDB blocks e.g. Thanos shipper meta file. If set TSDB will only compact 1 level blocks that are marked as uploaded in that file, improving external storage integrations e.g. with Thanos sidecar. 1+ level compactions won't be delayed.").
		Default("").StringVar(&tsdbDelayCompactFilePath)

	agentOnlyFlag(a, "storage.agent.path", "Base path for metrics storage.").
		Default("data-agent/").StringVar(&cfg.agentStoragePath)

	agentOnlyFlag(a, "storage.agent.wal-segment-size",
		"Size at which to split WAL segment files. Example: 100MB").
		Hidden().PlaceHolder("<bytes>").BytesVar(&cfg.agent.WALSegmentSize)

	var (
		agentWALCompression     bool
		agentWALCompressionType string
	)
	agentOnlyFlag(a, "storage.agent.wal-compression", "Compress the agent WAL. If false, the --storage.agent.wal-compression-type flag is ignored.").
		Default("true").BoolVar(&agentWALCompression)

	agentOnlyFlag(a, "storage.agent.wal-compression-type", "Compression algorithm for the agent WAL, used when --storage.agent.wal-compression is true.").
		Hidden().Default(compression.Snappy).EnumVar(&agentWALCompressionType, compression.Snappy, compression.Zstd)

	agentOnlyFlag(a, "storage.agent.wal-truncate-frequency",
		"The frequency at which to truncate the WAL and remove old data.").
		Hidden().PlaceHolder("<duration>").SetValue(&cfg.agent.TruncateFrequency)

	agentOnlyFlag(a, "storage.agent.retention.min-time",
		"Minimum age samples may be before being considered for deletion when the WAL is truncated").
		SetValue(&cfg.agent.MinWALTime)

	agentOnlyFlag(a, "storage.agent.retention.max-time",
		"Maximum age samples may be before being forcibly deleted when the WAL is truncated").
		SetValue(&cfg.agent.MaxWALTime)