Struct Metrics 

pub struct Metrics { /* private fields */ }

Central metrics collector for RAG++.

Provides counters, gauges, and histograms for monitoring.

Metrics

• ragpp_queries_total - Total queries processed
• ragpp_query_latency_seconds - Query latency histogram
• ragpp_index_size - Number of vectors per index
• ragpp_cache_hits_total - Cache hit count
• ragpp_cache_misses_total - Cache miss count
• ragpp_wal_writes_total - WAL write count
• ragpp_buffer_flushes_total - Buffer flush count

Implementations

impl Metrics

pub fn new(config: MetricsConfig) -> Self

Create new metrics collector.

pub fn default_metrics() -> Self

Create with default config.

pub fn record_query( &self, latency: Duration, result_count: usize, index_name: Option<&str>, )

Record a query.

pub fn record_cache_hit(&self)

Record a cache hit.

pub fn record_cache_miss(&self)

Record a cache miss.

pub fn record_wal_write(&self)

Record a WAL write.

pub fn record_buffer_flush(&self, records_flushed: usize)

Record a buffer flush.

pub fn record_error(&self, error_type: &str)

Record an error.

pub fn set_index_size(&self, index_name: &str, size: usize)

Update index size gauge.

pub fn set_store_size(&self, size: usize)

Update store size gauge.

pub fn set_memory_bytes(&self, bytes: usize)

Update memory usage gauge.

pub fn snapshot(&self) -> MetricsSnapshot

Get snapshot of current metrics.

pub fn cache_hit_ratio(&self) -> f64

Calculate cache hit ratio.

Trait Implementations

impl Debug for Metrics

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for Metrics

fn default() -> Self

Returns the “default value” for a type.