feat: add Prometheus metrics endpoint (#19)

* feat: add Prometheus metrics endpoint

Add /metrics endpoint with Prometheus-compatible instrumentation:
- pkg/metrics: counters, histograms, gauges for requests, latency,
  chunks processed, reduction ratio, active requests, clusters formed
- Middleware wraps /v1/dedupe and /v1/retrieve handlers
- Replaces the old JSON /metrics in serve.go
- Grafana dashboard template (grafana/dashboard.json)
- 8 unit tests for metrics package
- README monitoring section with scrape config

Closes #7

Co-authored-by: Ona <no-reply@ona.com>

* fix: use non-deprecated prometheus collectors

Co-authored-by: Ona <no-reply@ona.com>

---------

Co-authored-by: Ona <no-reply@ona.com>

Author: Siddhant-K-code

README.md

@@ -375,6 +375,34 @@ Or manually:
 
 Connect your repo and set `OPENAI_API_KEY` in environment variables.
 
+## Monitoring
+
+Distill exposes a Prometheus-compatible `/metrics` endpoint on both `api` and `serve` commands.
+
+### Metrics
+
+| Metric | Type | Description |
+|--------|------|-------------|
+| `distill_requests_total` | Counter | Total requests by endpoint and status code |
+| `distill_request_duration_seconds` | Histogram | Request latency distribution |
+| `distill_chunks_processed_total` | Counter | Chunks processed (input/output) |
+| `distill_reduction_ratio` | Histogram | Chunk reduction ratio per request |
+| `distill_active_requests` | Gauge | Currently processing requests |
+| `distill_clusters_formed_total` | Counter | Clusters formed during deduplication |
+
+### Prometheus Scrape Config
+
+```yaml
+scrape_configs:
+  - job_name: distill
+    static_configs:
+      - targets: ['localhost:8080']
+```
+
+### Grafana Dashboard
+
+Import the included dashboard from `grafana/dashboard.json` or use dashboard UID `distill-overview`.
+
 ## Architecture
 
 ```

cmd/api.go

@@ -13,6 +13,7 @@ import (
 
 	"github.com/Siddhant-K-code/distill/pkg/contextlab"
 	"github.com/Siddhant-K-code/distill/pkg/embedding/openai"
+	"github.com/Siddhant-K-code/distill/pkg/metrics"
 	"github.com/Siddhant-K-code/distill/pkg/types"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
@@ -93,6 +94,7 @@ type APIServer struct {
 	embedder  *openai.Client
 	validKeys map[string]bool
 	hasAuth   bool
+	metrics   *metrics.Metrics
 }
 
 func runAPI(cmd *cobra.Command, args []string) error {
@@ -135,16 +137,22 @@ func runAPI(cmd *cobra.Command, args []string) error {
 		}
 	}
 
+	m := metrics.New()
+
 	server := &APIServer{
 		embedder:  embedder,
 		validKeys: validKeys,
 		hasAuth:   len(validKeys) > 0,
+		metrics:   m,
 	}
 
 	// Setup routes
 	mux := http.NewServeMux()
-	mux.HandleFunc("/v1/dedupe", server.handleDedupe)
+	mux.HandleFunc("/v1/dedupe", m.Middleware("/v1/dedupe", server.handleDedupe))
 	mux.HandleFunc("/health", server.handleHealth)
+	mux.HandleFunc("/metrics", func(w http.ResponseWriter, r *http.Request) {
+		m.Handler().ServeHTTP(w, r)
+	})
 	mux.HandleFunc("/", server.handleRoot)
 
 	// CORS middleware
@@ -186,6 +194,7 @@ func runAPI(cmd *cobra.Command, args []string) error {
 	fmt.Println("Endpoints:")
 	fmt.Printf("  POST http://%s/v1/dedupe\n", addr)
 	fmt.Printf("  GET  http://%s/health\n", addr)
+	fmt.Printf("  GET  http://%s/metrics\n", addr)
 	fmt.Println()
 
 	if err := httpServer.ListenAndServe(); err != http.ErrServerClosed {
@@ -219,8 +228,9 @@ func (s *APIServer) handleRoot(w http.ResponseWriter, r *http.Request) {
 		"version": "1.0.0",
 		"docs":    "https://distill.siddhantkhare.com/docs",
 		"endpoints": map[string]string{
-			"dedupe": "POST /v1/dedupe",
-			"health": "GET /health",
+			"dedupe":  "POST /v1/dedupe",
+			"health":  "GET /health",
+			"metrics": "GET /metrics",
 		},
 	})
 }
@@ -363,6 +373,9 @@ func (s *APIServer) handleDedupe(w http.ResponseWriter, r *http.Request) {
 		},
 	}
 
+	// Record dedup-specific metrics
+	s.metrics.RecordDedup("/v1/dedupe", len(req.Chunks), len(representatives), clusterResult.ClusterCount)
+
 	w.Header().Set("Content-Type", "application/json")
 	_ = json.NewEncoder(w).Encode(resp)
 }

cmd/serve.go

@@ -12,6 +12,7 @@ import (
 
 	"github.com/Siddhant-K-code/distill/pkg/contextlab"
 	"github.com/Siddhant-K-code/distill/pkg/embedding/openai"
+	"github.com/Siddhant-K-code/distill/pkg/metrics"
 	"github.com/Siddhant-K-code/distill/pkg/retriever"
 	pcretriever "github.com/Siddhant-K-code/distill/pkg/retriever/pinecone"
 	qdretriever "github.com/Siddhant-K-code/distill/pkg/retriever/qdrant"
@@ -77,8 +78,9 @@ func init() {
 
 // Server holds the HTTP server state.
 type Server struct {
-	broker *contextlab.Broker
-	cfg    ServerConfig
+	broker  *contextlab.Broker
+	cfg     ServerConfig
+	metrics *metrics.Metrics
 }
 
 // ServerConfig holds server configuration.
@@ -232,20 +234,25 @@ func runServe(cmd *cobra.Command, args []string) error {
 	}
 	defer func() { _ = broker.Close() }()
 
+	m := metrics.New()
+
 	// Create server
 	server := &Server{
 		broker: broker,
 		cfg: ServerConfig{
 			Host: host,
 			Port: port,
 		},
+		metrics: m,
 	}
 
 	// Setup routes
 	mux := http.NewServeMux()
-	mux.HandleFunc("/v1/retrieve", server.handleRetrieve)
+	mux.HandleFunc("/v1/retrieve", m.Middleware("/v1/retrieve", server.handleRetrieve))
 	mux.HandleFunc("/health", server.handleHealth)
-	mux.HandleFunc("/metrics", server.handleMetrics)
+	mux.HandleFunc("/metrics", func(w http.ResponseWriter, r *http.Request) {
+		m.Handler().ServeHTTP(w, r)
+	})
 
 	// Create HTTP server
 	addr := fmt.Sprintf("%s:%d", host, port)
@@ -370,6 +377,9 @@ func (s *Server) handleRetrieve(w http.ResponseWriter, r *http.Request) {
 		},
 	}
 
+	// Record dedup-specific metrics
+	s.metrics.RecordDedup("/v1/retrieve", result.Stats.Retrieved, result.Stats.Returned, result.Stats.Clustered)
+
 	w.Header().Set("Content-Type", "application/json")
 	_ = json.NewEncoder(w).Encode(resp)
 }
@@ -378,17 +388,3 @@ func (s *Server) handleHealth(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "application/json")
 	_ = json.NewEncoder(w).Encode(map[string]string{"status": "ok"})
 }
-
-func (s *Server) handleMetrics(w http.ResponseWriter, r *http.Request) {
-	cfg := s.broker.GetConfig()
-	w.Header().Set("Content-Type", "application/json")
-	_ = json.NewEncoder(w).Encode(map[string]interface{}{
-		"config": map[string]interface{}{
-			"over_fetch_k": cfg.OverFetchK,
-			"target_k":     cfg.TargetK,
-			"threshold":    cfg.ClusterThreshold,
-			"lambda":       cfg.MMRLambda,
-			"mmr_enabled":  cfg.EnableMMR,
-		},
-	})
-}

go.mod

@@ -7,6 +7,8 @@ toolchain go1.24.11
 require (
 	github.com/mark3labs/mcp-go v0.43.2
 	github.com/pinecone-io/go-pinecone/v3 v3.1.0
+	github.com/prometheus/client_golang v1.23.2
+	github.com/prometheus/client_model v0.6.2
 	github.com/qdrant/go-client v1.16.2
 	github.com/schollz/progressbar/v3 v3.14.6
 	github.com/spf13/cobra v1.8.1
@@ -18,7 +20,9 @@ require (
 require (
 	github.com/apapsch/go-jsonmerge/v2 v2.0.0 // indirect
 	github.com/bahlo/generic-list-go v0.2.0 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/buger/jsonparser v1.1.1 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/fsnotify/fsnotify v1.7.0 // indirect
 	github.com/google/uuid v1.6.0 // indirect
@@ -29,9 +33,12 @@ require (
 	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/oapi-codegen/runtime v1.1.1 // indirect
 	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/prometheus/common v0.66.1 // indirect
+	github.com/prometheus/procfs v0.16.1 // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
 	github.com/sagikazarmark/locafero v0.4.0 // indirect
 	github.com/sagikazarmark/slog-shim v0.1.0 // indirect
@@ -45,6 +52,7 @@ require (
 	github.com/yosida95/uritemplate/v3 v3.0.2 // indirect
 	go.uber.org/atomic v1.9.0 // indirect
 	go.uber.org/multierr v1.9.0 // indirect
+	go.yaml.in/yaml/v2 v2.4.2 // indirect
 	golang.org/x/exp v0.0.0-20230905200255-921286631fa9 // indirect
 	golang.org/x/net v0.47.0 // indirect
 	golang.org/x/sys v0.38.0 // indirect

go.sum

@@ -3,9 +3,13 @@ github.com/apapsch/go-jsonmerge/v2 v2.0.0 h1:axGnT1gRIfimI7gJifB699GoE/oq+F2MU7D
 github.com/apapsch/go-jsonmerge/v2 v2.0.0/go.mod h1:lvDnEdqiQrp0O42VQGgmlKpxL1AP2+08jFMw88y4klk=
 github.com/bahlo/generic-list-go v0.2.0 h1:5sz/EEAK+ls5wF+NeqDpk5+iNdMDXrh3z3nPnH1Wvgk=
 github.com/bahlo/generic-list-go v0.2.0/go.mod h1:2KvAjgMlE5NNynlg/5iLrrCCZ2+5xWbdbCW3pNTGyYg=
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/bmatcuk/doublestar v1.1.1/go.mod h1:UD6OnuiIn0yFxxA2le/rnRU1G4RaI4UvFv1sNto9p6w=
 github.com/buger/jsonparser v1.1.1 h1:2PnMjfWD7wBILjqQbt530v576A/cAbQvEW9gGIpYMUs=
 github.com/buger/jsonparser v1.1.1/go.mod h1:6RYKKt7H4d4+iWqouImQ9R2FZql3VbhNgx27UK13J/0=
+github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
+github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/cpuguy83/go-md2man/v2 v2.0.4/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@@ -34,10 +38,14 @@ github.com/invopop/jsonschema v0.13.0/go.mod h1:ffZ5Km5SWWRAIN6wbDXItl95euhFz2uO
 github.com/josharian/intern v1.0.0/go.mod h1:5DoeVV0s6jJacbCEi61lwdGj/aVlrQvzHFFd8Hwg//Y=
 github.com/juju/gnuflag v0.0.0-20171113085948-2ce1bb71843d/go.mod h1:2PavIy+JPciBPrBUjwbNvtwB6RQlve+hkpll6QSNmOE=
 github.com/k0kubun/go-ansi v0.0.0-20180517002512-3bf9e2903213/go.mod h1:vNUNkEQ1e29fT/6vq2aBdFsgNPmy8qMdSay1npru+Sw=
+github.com/klauspost/compress v1.18.1 h1:bcSGx7UbpBqMChDtsF28Lw6v/G94LPrrbMbdC3JH2co=
+github.com/klauspost/compress v1.18.1/go.mod h1:ZQFFVG+MdnR0P+l6wpXgIL4NTtwiKIdBnrBd8Nrxr+0=
 github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
 github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
+github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
 github.com/magiconair/properties v1.8.10 h1:s31yESBquKXCV9a/ScB3ESkOjUYYv+X0rg8SYxI99mE=
 github.com/magiconair/properties v1.8.10/go.mod h1:Dhd985XPs7jluiymwWYZ0G4Z61jb3vdS329zhj2hYo0=
 github.com/mailru/easyjson v0.7.7 h1:UGYAvKxe3sBsEDzO8ZeWOSlIQfWFlxbzLZe7hwFURr0=
@@ -49,6 +57,8 @@ github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db h1:62I3jR2Em
 github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db/go.mod h1:l0dey0ia/Uv7NcFFVbCLtqEBQbrT4OCwCSKTEv6enCw=
 github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyuac5Z2hdY=
 github.com/mitchellh/mapstructure v1.5.0/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
 github.com/oapi-codegen/runtime v1.1.1 h1:EXLHh0DXIJnWhdRPN2w4MXAzFyE4CskzhNLUmtpMYro=
 github.com/oapi-codegen/runtime v1.1.1/go.mod h1:SK9X900oXmPWilYR5/WKPzt3Kqxn/uS/+lbpREv+eCg=
 github.com/pelletier/go-toml/v2 v2.2.2 h1:aYUidT7k73Pcl9nb2gScu7NSrKCSHIDE89b3+6Wq+LM=
@@ -58,12 +68,20 @@ github.com/pinecone-io/go-pinecone/v3 v3.1.0/go.mod h1:v8VJwwmZFesCP3bIYv98eU/kI
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRIccs7FGNTlIRMkT8wgtp5eCXdBlqhYGL6U=
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/prometheus/client_golang v1.23.2 h1:Je96obch5RDVy3FDMndoUsjAhG5Edi49h0RJWRi/o0o=
+github.com/prometheus/client_golang v1.23.2/go.mod h1:Tb1a6LWHB3/SPIzCoaDXI4I8UHKeFTEQ1YCr+0Gyqmg=
+github.com/prometheus/client_model v0.6.2 h1:oBsgwpGs7iVziMvrGhE53c/GrLUsZdHnqNwqPLxwZyk=
+github.com/prometheus/client_model v0.6.2/go.mod h1:y3m2F6Gdpfy6Ut/GBsUqTWZqCUvMVzSfMLjcu6wAwpE=
+github.com/prometheus/common v0.66.1 h1:h5E0h5/Y8niHc5DlaLlWLArTQI7tMrsfQjHV+d9ZoGs=
+github.com/prometheus/common v0.66.1/go.mod h1:gcaUsgf3KfRSwHY4dIMXLPV0K/Wg1oZ8+SbZk/HH/dA=
+github.com/prometheus/procfs v0.16.1 h1:hZ15bTNuirocR6u0JZ6BAHHmwS1p8B4P6MRqxtzMyRg=
+github.com/prometheus/procfs v0.16.1/go.mod h1:teAbpZRB1iIAJYREa1LsoWUXykVXA1KlTmWl8x/U+Is=
 github.com/qdrant/go-client v1.16.2 h1:UUMJJfvXTByhwhH1DwWdbkhZ2cTdvSqVkXSIfBrVWSg=
 github.com/qdrant/go-client v1.16.2/go.mod h1:I+EL3h4HRoRTeHtbfOd/4kDXwCukZfkd41j/9wryGkw=
 github.com/rivo/uniseg v0.4.7 h1:WUdvkW8uEhrYfLC4ZzdpI2ztxP1I582+49Oc5Mq64VQ=
 github.com/rivo/uniseg v0.4.7/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
-github.com/rogpeppe/go-internal v1.9.0 h1:73kH8U+JUqXU8lRuOHeVHaa/SZPifC7BkcraZVejAe8=
-github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs=
+github.com/rogpeppe/go-internal v1.10.0 h1:TMyTOH3F/DB16zRVcYyreMH6GnZZrwQVAoYjRBZyWFQ=
+github.com/rogpeppe/go-internal v1.10.0/go.mod h1:UQnix2H7Ngw/k4C5ijL5+65zddjncjaFoBhdsK/akog=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/sagikazarmark/locafero v0.4.0 h1:HApY1R9zGo4DBgr7dqsTH/JJxLTTsOt7u6keLGt6kNQ=
 github.com/sagikazarmark/locafero v0.4.0/go.mod h1:Pe1W6UlPYUk/+wc/6KFhbORCfqzgYEpgQ3O5fPuL3H4=
@@ -115,8 +133,12 @@ go.opentelemetry.io/otel/trace v1.38.0 h1:Fxk5bKrDZJUH+AMyyIXGcFAPah0oRcT+LuNtJr
 go.opentelemetry.io/otel/trace v1.38.0/go.mod h1:j1P9ivuFsTceSWe1oY+EeW3sc+Pp42sO++GHkg4wwhs=
 go.uber.org/atomic v1.9.0 h1:ECmE8Bn/WFTYwEW/bpKD3M8VtR/zQVbavAoalC1PYyE=
 go.uber.org/atomic v1.9.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
+go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
+go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
 go.uber.org/multierr v1.9.0 h1:7fIwc/ZtS0q++VgcfqFDxSBZVv/Xo49/SYnDFupUwlI=
 go.uber.org/multierr v1.9.0/go.mod h1:X2jQV1h+kxSjClGpnseKVIxpmcjrj7MNnI0bnlfKTVQ=
+go.yaml.in/yaml/v2 v2.4.2 h1:DzmwEr2rDGHl7lsFgAHxmNz/1NlQ7xLIrlN2h5d1eGI=
+go.yaml.in/yaml/v2 v2.4.2/go.mod h1:081UH+NErpNdqlCXm3TtEran0rJZGxAYx9hb/ELlsPU=
 golang.org/x/exp v0.0.0-20230905200255-921286631fa9 h1:GoHiUyI/Tp2nVkLI2mCxVkOjsbSXD66ic0XW0js0R9g=
 golang.org/x/exp v0.0.0-20230905200255-921286631fa9/go.mod h1:S2oDrQGGwySpoQPVqRShND87VCbxmc6bL1Yd2oYrm6k=
 golang.org/x/net v0.47.0 h1:Mx+4dIFzqraBXUugkia1OOvlD6LemFo1ALMHjrXDOhY=
@@ -141,8 +163,8 @@ google.golang.org/grpc v1.76.0/go.mod h1:Ju12QI8M6iQJtbcsV+awF5a4hfJMLi4X0JLo94U
 google.golang.org/protobuf v1.36.10 h1:AYd7cD/uASjIL6Q9LiTjz8JLcrh/88q5UObnmY3aOOE=
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