From 3981787a37e8681a1244292ff4d899782fa86b67 Mon Sep 17 00:00:00 2001
From: Nathan ter Bogt <nterbogt@gmail.com>
Date: Wed, 8 Apr 2026 07:38:52 +1200
Subject: [PATCH 1/7] Adding ability to detect application metrics

---
 internal/server/mock/metrics/server.go |   2 +-
 metrics.proto                          |   6 +-
 pb/metrics.pb.go                       | 162 ++++++++++++++-----------
 3 files changed, 98 insertions(+), 72 deletions(-)

diff --git a/internal/server/mock/metrics/server.go b/internal/server/mock/metrics/server.go
index 49981d2..6090bb5 100644
--- a/internal/server/mock/metrics/server.go
+++ b/internal/server/mock/metrics/server.go
@@ -96,7 +96,7 @@ func (s *Server) AbsoluteRange(ctx context.Context, req *pb.AbsoluteRangeRequest
 		cacheKey := fmt.Sprintf("%s_%s", req.Type, req.Metric)
 		metric := pb.MetricValue{
 			Timestamp: timestamppb.New(metricTime),
-			Value:     deterministicRange(metricTime, metricMin, metricMax, 60, cacheKey),
+			Value:     new(deterministicRange(metricTime, metricMin, metricMax, 60, cacheKey)),
 		}
 		output = append(output, &metric)
 		metricTime = metricTime.Add(time.Minute)
diff --git a/metrics.proto b/metrics.proto
index aa674ba..8451477 100644
--- a/metrics.proto
+++ b/metrics.proto
@@ -28,6 +28,7 @@ enum MetricType {
 message AvailableMetricsRequest {
   MetricType type = 1; // The type of the metric.
   optional string environment = 2; // Name of the environment. Required when using ENVIRONMENT type.
+  optional bool application = 3; // Whether to return application metrics or not. Unset for both.
 }
 
 /**
@@ -43,6 +44,7 @@ message AvailableMetricsResponse {
 message MetricDefinition {
   string name = 1; // The name of the metric.
   MetricType type = 2; // The type of the metric.
+  bool application = 3; // Whether the metric is an application metric or not.
 }
 
 /**
@@ -67,6 +69,6 @@ message AbsoluteRangeResponse {
  * Output for a single metric response.
  */
 message MetricValue {
-  google.protobuf.Timestamp timestamp = 1; // The timestamp of the metric..
-  double value = 2; // The value of the metric at the given timestamp.
+  google.protobuf.Timestamp timestamp = 1; // The timestamp of the metric.
+  optional double value = 2; // The value of the metric at the given timestamp.
 }
diff --git a/pb/metrics.pb.go b/pb/metrics.pb.go
index 648524e..e9e678b 100644
--- a/pb/metrics.pb.go
+++ b/pb/metrics.pb.go
@@ -85,6 +85,7 @@ type AvailableMetricsRequest struct {
 
 	Type        MetricType `protobuf:"varint,1,opt,name=type,proto3,enum=workflow.MetricType" json:"type,omitempty"` // The type of the metric.
 	Environment *string    `protobuf:"bytes,2,opt,name=environment,proto3,oneof" json:"environment,omitempty"`       // Name of the environment. Required when using ENVIRONMENT type.
+	Application *bool      `protobuf:"varint,3,opt,name=application,proto3,oneof" json:"application,omitempty"`      // Whether to return application metrics or not. Unset for both.
 }
 
 func (x *AvailableMetricsRequest) Reset() {
@@ -133,6 +134,13 @@ func (x *AvailableMetricsRequest) GetEnvironment() string {
 	return ""
 }
 
+func (x *AvailableMetricsRequest) GetApplication() bool {
+	if x != nil && x.Application != nil {
+		return *x.Application
+	}
+	return false
+}
+
 // *
 // Output for AvailableMetricsRequest.
 type AvailableMetricsResponse struct {
@@ -189,8 +197,9 @@ type MetricDefinition struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Name string     `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`                           // The name of the metric.
-	Type MetricType `protobuf:"varint,2,opt,name=type,proto3,enum=workflow.MetricType" json:"type,omitempty"` // The type of the metric.
+	Name        string     `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`                           // The name of the metric.
+	Type        MetricType `protobuf:"varint,2,opt,name=type,proto3,enum=workflow.MetricType" json:"type,omitempty"` // The type of the metric.
+	Application bool       `protobuf:"varint,3,opt,name=application,proto3" json:"application,omitempty"`            // Whether the metric is an application metric or not.
 }
 
 func (x *MetricDefinition) Reset() {
@@ -239,6 +248,13 @@ func (x *MetricDefinition) GetType() MetricType {
 	return MetricType_METRIC_TYPE_UNSPECIFIED
 }
 
+func (x *MetricDefinition) GetApplication() bool {
+	if x != nil {
+		return x.Application
+	}
+	return false
+}
+
 // *
 // Input for AbsoluteRangeRequest.
 type AbsoluteRangeRequest struct {
@@ -376,8 +392,8 @@ type MetricValue struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Timestamp *timestamppb.Timestamp `protobuf:"bytes,1,opt,name=timestamp,proto3" json:"timestamp,omitempty"` // The timestamp of the metric..
-	Value     float64                `protobuf:"fixed64,2,opt,name=value,proto3" json:"value,omitempty"`       // The value of the metric at the given timestamp.
+	Timestamp *timestamppb.Timestamp `protobuf:"bytes,1,opt,name=timestamp,proto3" json:"timestamp,omitempty"` // The timestamp of the metric.
+	Value     *float64               `protobuf:"fixed64,2,opt,name=value,proto3,oneof" json:"value,omitempty"` // The value of the metric at the given timestamp.
 }
 
 func (x *MetricValue) Reset() {
@@ -420,8 +436,8 @@ func (x *MetricValue) GetTimestamp() *timestamppb.Timestamp {
 }
 
 func (x *MetricValue) GetValue() float64 {
-	if x != nil {
-		return x.Value
+	if x != nil && x.Value != nil {
+		return *x.Value
 	}
 	return 0
 }
@@ -432,70 +448,77 @@ var file_metrics_proto_rawDesc = []byte{
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+	0x74, 0x6f, 0x33,
 }
 
 var (
@@ -623,6 +646,7 @@ func file_metrics_proto_init() {
 	}
 	file_metrics_proto_msgTypes[0].OneofWrappers = []interface{}{}
 	file_metrics_proto_msgTypes[3].OneofWrappers = []interface{}{}
+	file_metrics_proto_msgTypes[5].OneofWrappers = []interface{}{}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
 		File: protoimpl.DescBuilder{

From 4bbb97a035935c387e37ea22dd9f6e4f61b9d82d Mon Sep 17 00:00:00 2001
From: Nathan ter Bogt <nterbogt@gmail.com>
Date: Thu, 9 Apr 2026 08:19:36 +1200
Subject: [PATCH 2/7] Adding a title to the definitions. Extending mock for
 application metrics.

---
 internal/server/mock/metrics/server.go |  79 +++++++++--------
 metrics.proto                          |   1 +
 pb/metrics.pb.go                       | 115 +++++++++++++------------
 3 files changed, 108 insertions(+), 87 deletions(-)

diff --git a/internal/server/mock/metrics/server.go b/internal/server/mock/metrics/server.go
index 6090bb5..d371322 100644
--- a/internal/server/mock/metrics/server.go
+++ b/internal/server/mock/metrics/server.go
@@ -4,8 +4,7 @@ import (
 	"context"
 	"fmt"
 	"hash/fnv"
-	"maps"
-	"slices"
+	"strings"
 	"time"
 
 	"github.com/skpr/api/pb"
@@ -19,6 +18,12 @@ type Server struct {
 	pb.UnimplementedMetricsServer
 }
 
+type MockMetric struct {
+	Min         float64
+	Max         float64
+	Application bool
+}
+
 // deterministicRange returns a specific value consistently for a point in a time series.
 func deterministicRange(t time.Time, minVal, maxVal float64, seconds int64, key string) float64 {
 	h := fnv.New32a()
@@ -31,34 +36,37 @@ func deterministicRange(t time.Time, minVal, maxVal float64, seconds int64, key
 	return minVal + (hashVal * rangeSize)
 }
 
-func metricMappings(metricType pb.MetricType) map[string][]float64 {
-	data := map[pb.MetricType]map[string][]float64{
+func metricMappings(metricType pb.MetricType) map[string]MockMetric {
+	data := map[pb.MetricType]map[string]MockMetric{
 		pb.MetricType_CLUSTER: {
-			"requests":            {250_000, 4_000_000},
-			"httpcode_target_200": {500, 1_000},
-			"httpcode_target_300": {25, 50},
-			"httpcode_target_400": {10, 25},
-			"httpcode_target_500": {0, 10},
+			"requests":            {250_000, 4_000_000, false},
+			"httpcode_target_200": {500, 1_000, false},
+			"httpcode_target_300": {25, 50, false},
+			"httpcode_target_400": {10, 25, false},
+			"httpcode_target_500": {0, 10, false},
 		},
 		pb.MetricType_ENVIRONMENT: {
-			"requests":              {25_000, 200_000},
-			"cpu":                   {25, 100},
-			"memory":                {512_000, 4_294_967_296}, // 512KB to 4GB
-			"replicas":              {2, 8},
-			"php_active":            {4, 48},
-			"php_idle":              {2, 12},
-			"php_queued":            {0, 8},
-			"cache_hit_rate":        {60, 99},
-			"invalidation_paths":    {10, 50},
-			"invalidation_requests": {5, 20},
-			"origin_errors":         {0, 10},
-			"httpcode_target_200":   {200, 500},
-			"httpcode_target_300":   {25, 50},
-			"httpcode_target_400":   {10, 25},
-			"httpcode_target_500":   {0, 10},
-			"response_times_avg":    {0.1, 0.25},
-			"response_times_p95":    {2.0, 5.0},
-			"response_times_p99":    {10.0, 20.0},
+			"requests":              {25_000, 200_000, false},
+			"cpu":                   {25, 100, false},
+			"memory":                {512_000, 4_294_967_296, false}, // 512KB to 4GB
+			"replicas":              {2, 8, false},
+			"php_active":            {4, 48, false},
+			"php_idle":              {2, 12, false},
+			"php_queued":            {0, 8, false},
+			"cache_hit_rate":        {60, 99, false},
+			"invalidation_paths":    {10, 50, false},
+			"invalidation_requests": {5, 20, false},
+			"origin_errors":         {0, 10, false},
+			"httpcode_target_200":   {200, 500, false},
+			"httpcode_target_300":   {25, 50, false},
+			"httpcode_target_400":   {10, 25, false},
+			"httpcode_target_500":   {0, 10, false},
+			"response_times_avg":    {0.1, 0.25, false},
+			"response_times_p95":    {2.0, 5.0, false},
+			"response_times_p99":    {10.0, 20.0, false},
+			"mock_application_1":    {0, 100, true},
+			"mock_application_2":    {0.3, 1.4, true},
+			"mock_application_3":    {0, 100_000_000, true},
 		},
 	}
 	return data[metricType]
@@ -67,14 +75,17 @@ func metricMappings(metricType pb.MetricType) map[string][]float64 {
 // AvailableMetrics lists all available metrics.
 func (s *Server) AvailableMetrics(ctx context.Context, req *pb.AvailableMetricsRequest) (*pb.AvailableMetricsResponse, error) {
 	mappings := metricMappings(req.Type)
-	keys := slices.Collect(maps.Keys(mappings))
 
-	metrics := make([]*pb.MetricDefinition, len(keys))
-	for i, key := range keys {
-		metrics[i] = &pb.MetricDefinition{
-			Name: key,
-			Type: req.Type,
+	metrics := []*pb.MetricDefinition{}
+	for key, _ := range mappings {
+		if req.Application != nil && mappings[key].Application != *req.Application {
+			continue
 		}
+		metrics = append(metrics, &pb.MetricDefinition{
+			Name:  key,
+			Type:  req.Type,
+			Title: strings.ReplaceAll(key, "_", " "),
+		})
 	}
 
 	return &pb.AvailableMetricsResponse{
@@ -88,7 +99,7 @@ func (s *Server) AbsoluteRange(ctx context.Context, req *pb.AbsoluteRangeRequest
 	if _, ok := mappings[req.Metric]; !ok {
 		return nil, status.Errorf(codes.NotFound, "metric %s not found", req.Metric)
 	}
-	metricMin, metricMax := mappings[req.Metric][0], mappings[req.Metric][1]
+	metricMin, metricMax := mappings[req.Metric].Min, mappings[req.Metric].Max
 
 	output := []*pb.MetricValue{}
 	metricTime := req.StartTime.AsTime()
diff --git a/metrics.proto b/metrics.proto
index 8451477..da358d2 100644
--- a/metrics.proto
+++ b/metrics.proto
@@ -45,6 +45,7 @@ message MetricDefinition {
   string name = 1; // The name of the metric.
   MetricType type = 2; // The type of the metric.
   bool application = 3; // Whether the metric is an application metric or not.
+  string title = 4; // A human-readable title for the metric.
 }
 
 /**
diff --git a/pb/metrics.pb.go b/pb/metrics.pb.go
index e9e678b..89584ff 100644
--- a/pb/metrics.pb.go
+++ b/pb/metrics.pb.go
@@ -200,6 +200,7 @@ type MetricDefinition struct {
 	Name        string     `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`                           // The name of the metric.
 	Type        MetricType `protobuf:"varint,2,opt,name=type,proto3,enum=workflow.MetricType" json:"type,omitempty"` // The type of the metric.
 	Application bool       `protobuf:"varint,3,opt,name=application,proto3" json:"application,omitempty"`            // Whether the metric is an application metric or not.
+	Title       string     `protobuf:"bytes,4,opt,name=title,proto3" json:"title,omitempty"`                         // A human-readable title for the metric.
 }
 
 func (x *MetricDefinition) Reset() {
@@ -255,6 +256,13 @@ func (x *MetricDefinition) GetApplication() bool {
 	return false
 }
 
+func (x *MetricDefinition) GetTitle() string {
+	if x != nil {
+		return x.Title
+	}
+	return ""
+}
+
 // *
 // Input for AbsoluteRangeRequest.
 type AbsoluteRangeRequest struct {
@@ -465,60 +473,61 @@ var file_metrics_proto_rawDesc = []byte{
 	0x74, 0x72, 0x69, 0x63, 0x73, 0x18, 0x01, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x1a, 0x2e, 0x77, 0x6f,
 	0x72, 0x6b, 0x66, 0x6c, 0x6f, 0x77, 0x2e, 0x4d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x44, 0x65, 0x66,
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 }
 
 var (

From 24a89fb66623ddb008bd9e87405b86930713486e Mon Sep 17 00:00:00 2001
From: Nathan ter Bogt <nterbogt@gmail.com>
Date: Thu, 9 Apr 2026 08:27:31 +1200
Subject: [PATCH 3/7] Fixing a linting issue

---
 internal/server/mock/metrics/server.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/internal/server/mock/metrics/server.go b/internal/server/mock/metrics/server.go
index d371322..d05b5c4 100644
--- a/internal/server/mock/metrics/server.go
+++ b/internal/server/mock/metrics/server.go
@@ -77,7 +77,7 @@ func (s *Server) AvailableMetrics(ctx context.Context, req *pb.AvailableMetricsR
 	mappings := metricMappings(req.Type)
 
 	metrics := []*pb.MetricDefinition{}
-	for key, _ := range mappings {
+	for key := range mappings {
 		if req.Application != nil && mappings[key].Application != *req.Application {
 			continue
 		}

From 2cf0734263d2c13be58e6836d1b83d8f262c689a Mon Sep 17 00:00:00 2001
From: Nathan ter Bogt <nterbogt@gmail.com>
Date: Thu, 9 Apr 2026 10:53:54 +1200
Subject: [PATCH 4/7] Resolving issue with metric not having whether it's
 application or not.

---
 internal/server/mock/metrics/server.go | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/internal/server/mock/metrics/server.go b/internal/server/mock/metrics/server.go
index d05b5c4..dde2699 100644
--- a/internal/server/mock/metrics/server.go
+++ b/internal/server/mock/metrics/server.go
@@ -76,20 +76,18 @@ func metricMappings(metricType pb.MetricType) map[string]MockMetric {
 func (s *Server) AvailableMetrics(ctx context.Context, req *pb.AvailableMetricsRequest) (*pb.AvailableMetricsResponse, error) {
 	mappings := metricMappings(req.Type)
 
-	metrics := []*pb.MetricDefinition{}
-	for key := range mappings {
-		if req.Application != nil && mappings[key].Application != *req.Application {
-			continue
-		}
-		metrics = append(metrics, &pb.MetricDefinition{
-			Name:  key,
-			Type:  req.Type,
-			Title: strings.ReplaceAll(key, "_", " "),
+	availableMetrics := []*pb.MetricDefinition{}
+	for key, metric := range mappings {
+		availableMetrics = append(availableMetrics, &pb.MetricDefinition{
+			Name:        key,
+			Type:        req.Type,
+			Title:       strings.ReplaceAll(key, "_", " "),
+			Application: metric.Application,
 		})
 	}
 
 	return &pb.AvailableMetricsResponse{
-		Metrics: metrics,
+		Metrics: availableMetrics,
 	}, nil
 }
 

From 5ffe39d73574733ef393215da0ccfd4f511e7b85 Mon Sep 17 00:00:00 2001
From: Nathan ter Bogt <nterbogt@gmail.com>
Date: Thu, 9 Apr 2026 13:19:40 +1200
Subject: [PATCH 5/7] Build metrics list once

---
 internal/server/mock/metrics/server.go | 72 +++++++++++++-------------
 1 file changed, 37 insertions(+), 35 deletions(-)

diff --git a/internal/server/mock/metrics/server.go b/internal/server/mock/metrics/server.go
index dde2699..91d8cba 100644
--- a/internal/server/mock/metrics/server.go
+++ b/internal/server/mock/metrics/server.go
@@ -24,6 +24,40 @@ type MockMetric struct {
 	Application bool
 }
 
+// metricData is built once at package initialization
+var metricData = map[pb.MetricType]map[string]MockMetric{
+	pb.MetricType_CLUSTER: {
+		"requests":            {250_000, 4_000_000, false},
+		"httpcode_target_200": {500, 1_000, false},
+		"httpcode_target_300": {25, 50, false},
+		"httpcode_target_400": {10, 25, false},
+		"httpcode_target_500": {0, 10, false},
+	},
+	pb.MetricType_ENVIRONMENT: {
+		"requests":              {25_000, 200_000, false},
+		"cpu":                   {25, 100, false},
+		"memory":                {512_000, 4_294_967_296, false}, // 512KB to 4GB
+		"replicas":              {2, 8, false},
+		"php_active":            {4, 48, false},
+		"php_idle":              {2, 12, false},
+		"php_queued":            {0, 8, false},
+		"cache_hit_rate":        {60, 99, false},
+		"invalidation_paths":    {10, 50, false},
+		"invalidation_requests": {5, 20, false},
+		"origin_errors":         {0, 10, false},
+		"httpcode_target_200":   {200, 500, false},
+		"httpcode_target_300":   {25, 50, false},
+		"httpcode_target_400":   {10, 25, false},
+		"httpcode_target_500":   {0, 10, false},
+		"response_times_avg":    {0.1, 0.25, false},
+		"response_times_p95":    {2.0, 5.0, false},
+		"response_times_p99":    {10.0, 20.0, false},
+		"mock_application_1":    {0, 100, true},
+		"mock_application_2":    {0.3, 1.4, true},
+		"mock_application_3":    {0, 100_000_000, true},
+	},
+}
+
 // deterministicRange returns a specific value consistently for a point in a time series.
 func deterministicRange(t time.Time, minVal, maxVal float64, seconds int64, key string) float64 {
 	h := fnv.New32a()
@@ -37,39 +71,7 @@ func deterministicRange(t time.Time, minVal, maxVal float64, seconds int64, key
 }
 
 func metricMappings(metricType pb.MetricType) map[string]MockMetric {
-	data := map[pb.MetricType]map[string]MockMetric{
-		pb.MetricType_CLUSTER: {
-			"requests":            {250_000, 4_000_000, false},
-			"httpcode_target_200": {500, 1_000, false},
-			"httpcode_target_300": {25, 50, false},
-			"httpcode_target_400": {10, 25, false},
-			"httpcode_target_500": {0, 10, false},
-		},
-		pb.MetricType_ENVIRONMENT: {
-			"requests":              {25_000, 200_000, false},
-			"cpu":                   {25, 100, false},
-			"memory":                {512_000, 4_294_967_296, false}, // 512KB to 4GB
-			"replicas":              {2, 8, false},
-			"php_active":            {4, 48, false},
-			"php_idle":              {2, 12, false},
-			"php_queued":            {0, 8, false},
-			"cache_hit_rate":        {60, 99, false},
-			"invalidation_paths":    {10, 50, false},
-			"invalidation_requests": {5, 20, false},
-			"origin_errors":         {0, 10, false},
-			"httpcode_target_200":   {200, 500, false},
-			"httpcode_target_300":   {25, 50, false},
-			"httpcode_target_400":   {10, 25, false},
-			"httpcode_target_500":   {0, 10, false},
-			"response_times_avg":    {0.1, 0.25, false},
-			"response_times_p95":    {2.0, 5.0, false},
-			"response_times_p99":    {10.0, 20.0, false},
-			"mock_application_1":    {0, 100, true},
-			"mock_application_2":    {0.3, 1.4, true},
-			"mock_application_3":    {0, 100_000_000, true},
-		},
-	}
-	return data[metricType]
+	return metricData[metricType]
 }
 
 // AvailableMetrics lists all available metrics.
@@ -100,12 +102,12 @@ func (s *Server) AbsoluteRange(ctx context.Context, req *pb.AbsoluteRangeRequest
 	metricMin, metricMax := mappings[req.Metric].Min, mappings[req.Metric].Max
 
 	output := []*pb.MetricValue{}
+	seedKey := fmt.Sprintf("%s_%s", req.Type, req.Metric)
 	metricTime := req.StartTime.AsTime()
 	for metricTime.Before(req.EndTime.AsTime()) {
-		cacheKey := fmt.Sprintf("%s_%s", req.Type, req.Metric)
 		metric := pb.MetricValue{
 			Timestamp: timestamppb.New(metricTime),
-			Value:     new(deterministicRange(metricTime, metricMin, metricMax, 60, cacheKey)),
+			Value:     new(deterministicRange(metricTime, metricMin, metricMax, 60, seedKey)),
 		}
 		output = append(output, &metric)
 		metricTime = metricTime.Add(time.Minute)

From 16b2b9449ac0d669caa1df685270de7eab8c31b4 Mon Sep 17 00:00:00 2001
From: Nathan ter Bogt <nterbogt@gmail.com>
Date: Tue, 14 Apr 2026 14:51:28 +1200
Subject: [PATCH 6/7] Moving application boolean to a source enum

---
 internal/server/mock/metrics/server.go |  12 +-
 metrics.proto                          |  11 +-
 pb/metrics.pb.go                       | 224 ++++++++++++++++---------
 3 files changed, 158 insertions(+), 89 deletions(-)

diff --git a/internal/server/mock/metrics/server.go b/internal/server/mock/metrics/server.go
index 91d8cba..6d7fc2f 100644
--- a/internal/server/mock/metrics/server.go
+++ b/internal/server/mock/metrics/server.go
@@ -80,11 +80,15 @@ func (s *Server) AvailableMetrics(ctx context.Context, req *pb.AvailableMetricsR
 
 	availableMetrics := []*pb.MetricDefinition{}
 	for key, metric := range mappings {
+		source := pb.MetricSource_SYSTEM
+		if metric.Application {
+			source = pb.MetricSource_APPLICATION
+		}
 		availableMetrics = append(availableMetrics, &pb.MetricDefinition{
-			Name:        key,
-			Type:        req.Type,
-			Title:       strings.ReplaceAll(key, "_", " "),
-			Application: metric.Application,
+			Name:   key,
+			Type:   req.Type,
+			Title:  strings.ReplaceAll(key, "_", " "),
+			Source: source,
 		})
 	}
 
diff --git a/metrics.proto b/metrics.proto
index da358d2..7653576 100644
--- a/metrics.proto
+++ b/metrics.proto
@@ -14,7 +14,7 @@ service metrics {
   rpc AbsoluteRange (AbsoluteRangeRequest) returns (AbsoluteRangeResponse) {}
 }
 
-// Top-level enum definition
+// What the metric scope is.
 enum MetricType {
   METRIC_TYPE_UNSPECIFIED = 0;
   CLUSTER = 1;
@@ -22,6 +22,13 @@ enum MetricType {
   ENVIRONMENT = 3;
 }
 
+// Where this metric data is sourced.
+enum MetricSource {
+  METRIC_SOURCE_UNSPECIFIED = 0;
+  SYSTEM = 1;
+  APPLICATION = 2;
+}
+
 /**
  * Input for AvailableMetricsRequest.
  */
@@ -44,7 +51,7 @@ message AvailableMetricsResponse {
 message MetricDefinition {
   string name = 1; // The name of the metric.
   MetricType type = 2; // The type of the metric.
-  bool application = 3; // Whether the metric is an application metric or not.
+  MetricSource source = 3; // The source of the metric data.
   string title = 4; // A human-readable title for the metric.
 }
 
diff --git a/pb/metrics.pb.go b/pb/metrics.pb.go
index 89584ff..b08d3ac 100644
--- a/pb/metrics.pb.go
+++ b/pb/metrics.pb.go
@@ -23,7 +23,7 @@ const (
 	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
 )
 
-// Top-level enum definition
+// What the metric scope is.
 type MetricType int32
 
 const (
@@ -76,6 +76,56 @@ func (MetricType) EnumDescriptor() ([]byte, []int) {
 	return file_metrics_proto_rawDescGZIP(), []int{0}
 }
 
+// Where this metric data is sourced.
+type MetricSource int32
+
+const (
+	MetricSource_METRIC_SOURCE_UNSPECIFIED MetricSource = 0
+	MetricSource_SYSTEM                    MetricSource = 1
+	MetricSource_APPLICATION               MetricSource = 2
+)
+
+// Enum value maps for MetricSource.
+var (
+	MetricSource_name = map[int32]string{
+		0: "METRIC_SOURCE_UNSPECIFIED",
+		1: "SYSTEM",
+		2: "APPLICATION",
+	}
+	MetricSource_value = map[string]int32{
+		"METRIC_SOURCE_UNSPECIFIED": 0,
+		"SYSTEM":                    1,
+		"APPLICATION":               2,
+	}
+)
+
+func (x MetricSource) Enum() *MetricSource {
+	p := new(MetricSource)
+	*p = x
+	return p
+}
+
+func (x MetricSource) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (MetricSource) Descriptor() protoreflect.EnumDescriptor {
+	return file_metrics_proto_enumTypes[1].Descriptor()
+}
+
+func (MetricSource) Type() protoreflect.EnumType {
+	return &file_metrics_proto_enumTypes[1]
+}
+
+func (x MetricSource) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use MetricSource.Descriptor instead.
+func (MetricSource) EnumDescriptor() ([]byte, []int) {
+	return file_metrics_proto_rawDescGZIP(), []int{1}
+}
+
 // *
 // Input for AvailableMetricsRequest.
 type AvailableMetricsRequest struct {
@@ -197,10 +247,10 @@ type MetricDefinition struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Name        string     `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`                           // The name of the metric.
-	Type        MetricType `protobuf:"varint,2,opt,name=type,proto3,enum=workflow.MetricType" json:"type,omitempty"` // The type of the metric.
-	Application bool       `protobuf:"varint,3,opt,name=application,proto3" json:"application,omitempty"`            // Whether the metric is an application metric or not.
-	Title       string     `protobuf:"bytes,4,opt,name=title,proto3" json:"title,omitempty"`                         // A human-readable title for the metric.
+	Name   string       `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`                                 // The name of the metric.
+	Type   MetricType   `protobuf:"varint,2,opt,name=type,proto3,enum=workflow.MetricType" json:"type,omitempty"`       // The type of the metric.
+	Source MetricSource `protobuf:"varint,3,opt,name=source,proto3,enum=workflow.MetricSource" json:"source,omitempty"` // The source of the metric data.
+	Title  string       `protobuf:"bytes,4,opt,name=title,proto3" json:"title,omitempty"`                               // A human-readable title for the metric.
 }
 
 func (x *MetricDefinition) Reset() {
@@ -249,11 +299,11 @@ func (x *MetricDefinition) GetType() MetricType {
 	return MetricType_METRIC_TYPE_UNSPECIFIED
 }
 
-func (x *MetricDefinition) GetApplication() bool {
+func (x *MetricDefinition) GetSource() MetricSource {
 	if x != nil {
-		return x.Application
+		return x.Source
 	}
-	return false
+	return MetricSource_METRIC_SOURCE_UNSPECIFIED
 }
 
 func (x *MetricDefinition) GetTitle() string {
@@ -473,61 +523,67 @@ var file_metrics_proto_rawDesc = []byte{
 	0x74, 0x72, 0x69, 0x63, 0x73, 0x18, 0x01, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x1a, 0x2e, 0x77, 0x6f,
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+	0x73, 0x65, 0x22, 0x00, 0x42, 0x06, 0x5a, 0x04, 0x2e, 0x2f, 0x70, 0x62, 0x62, 0x06, 0x70, 0x72,
+	0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -542,36 +598,38 @@ func file_metrics_proto_rawDescGZIP() []byte {
 	return file_metrics_proto_rawDescData
 }
 
-var file_metrics_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
+var file_metrics_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
 var file_metrics_proto_msgTypes = make([]protoimpl.MessageInfo, 6)
 var file_metrics_proto_goTypes = []interface{}{
 	(MetricType)(0),                  // 0: workflow.MetricType
-	(*AvailableMetricsRequest)(nil),  // 1: workflow.AvailableMetricsRequest
-	(*AvailableMetricsResponse)(nil), // 2: workflow.AvailableMetricsResponse
-	(*MetricDefinition)(nil),         // 3: workflow.MetricDefinition
-	(*AbsoluteRangeRequest)(nil),     // 4: workflow.AbsoluteRangeRequest
-	(*AbsoluteRangeResponse)(nil),    // 5: workflow.AbsoluteRangeResponse
-	(*MetricValue)(nil),              // 6: workflow.MetricValue
-	(*timestamppb.Timestamp)(nil),    // 7: google.protobuf.Timestamp
+	(MetricSource)(0),                // 1: workflow.MetricSource
+	(*AvailableMetricsRequest)(nil),  // 2: workflow.AvailableMetricsRequest
+	(*AvailableMetricsResponse)(nil), // 3: workflow.AvailableMetricsResponse
+	(*MetricDefinition)(nil),         // 4: workflow.MetricDefinition
+	(*AbsoluteRangeRequest)(nil),     // 5: workflow.AbsoluteRangeRequest
+	(*AbsoluteRangeResponse)(nil),    // 6: workflow.AbsoluteRangeResponse
+	(*MetricValue)(nil),              // 7: workflow.MetricValue
+	(*timestamppb.Timestamp)(nil),    // 8: google.protobuf.Timestamp
 }
 var file_metrics_proto_depIdxs = []int32{
 	0,  // 0: workflow.AvailableMetricsRequest.type:type_name -> workflow.MetricType
-	3,  // 1: workflow.AvailableMetricsResponse.metrics:type_name -> workflow.MetricDefinition
+	4,  // 1: workflow.AvailableMetricsResponse.metrics:type_name -> workflow.MetricDefinition
 	0,  // 2: workflow.MetricDefinition.type:type_name -> workflow.MetricType
-	0,  // 3: workflow.AbsoluteRangeRequest.type:type_name -> workflow.MetricType
-	7,  // 4: workflow.AbsoluteRangeRequest.start_time:type_name -> google.protobuf.Timestamp
-	7,  // 5: workflow.AbsoluteRangeRequest.end_time:type_name -> google.protobuf.Timestamp
-	6,  // 6: workflow.AbsoluteRangeResponse.metrics:type_name -> workflow.MetricValue
-	7,  // 7: workflow.MetricValue.timestamp:type_name -> google.protobuf.Timestamp
-	1,  // 8: workflow.metrics.AvailableMetrics:input_type -> workflow.AvailableMetricsRequest
-	4,  // 9: workflow.metrics.AbsoluteRange:input_type -> workflow.AbsoluteRangeRequest
-	2,  // 10: workflow.metrics.AvailableMetrics:output_type -> workflow.AvailableMetricsResponse
-	5,  // 11: workflow.metrics.AbsoluteRange:output_type -> workflow.AbsoluteRangeResponse
-	10, // [10:12] is the sub-list for method output_type
-	8,  // [8:10] is the sub-list for method input_type
-	8,  // [8:8] is the sub-list for extension type_name
-	8,  // [8:8] is the sub-list for extension extendee
-	0,  // [0:8] is the sub-list for field type_name
+	1,  // 3: workflow.MetricDefinition.source:type_name -> workflow.MetricSource
+	0,  // 4: workflow.AbsoluteRangeRequest.type:type_name -> workflow.MetricType
+	8,  // 5: workflow.AbsoluteRangeRequest.start_time:type_name -> google.protobuf.Timestamp
+	8,  // 6: workflow.AbsoluteRangeRequest.end_time:type_name -> google.protobuf.Timestamp
+	7,  // 7: workflow.AbsoluteRangeResponse.metrics:type_name -> workflow.MetricValue
+	8,  // 8: workflow.MetricValue.timestamp:type_name -> google.protobuf.Timestamp
+	2,  // 9: workflow.metrics.AvailableMetrics:input_type -> workflow.AvailableMetricsRequest
+	5,  // 10: workflow.metrics.AbsoluteRange:input_type -> workflow.AbsoluteRangeRequest
+	3,  // 11: workflow.metrics.AvailableMetrics:output_type -> workflow.AvailableMetricsResponse
+	6,  // 12: workflow.metrics.AbsoluteRange:output_type -> workflow.AbsoluteRangeResponse
+	11, // [11:13] is the sub-list for method output_type
+	9,  // [9:11] is the sub-list for method input_type
+	9,  // [9:9] is the sub-list for extension type_name
+	9,  // [9:9] is the sub-list for extension extendee
+	0,  // [0:9] is the sub-list for field type_name
 }
 
 func init() { file_metrics_proto_init() }
@@ -661,7 +719,7 @@ func file_metrics_proto_init() {
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_metrics_proto_rawDesc,
-			NumEnums:      1,
+			NumEnums:      2,
 			NumMessages:   6,
 			NumExtensions: 0,
 			NumServices:   1,

From b12b007c79eea17c767ef95d768888a28337d0f3 Mon Sep 17 00:00:00 2001
From: Nathan ter Bogt <nterbogt@gmail.com>
Date: Tue, 14 Apr 2026 15:01:16 +1200
Subject: [PATCH 7/7] More updates to source

---
 internal/server/mock/metrics/server.go |  67 ++++-----
 metrics.proto                          |   2 +-
 pb/metrics.pb.go                       | 189 +++++++++++++------------
 3 files changed, 130 insertions(+), 128 deletions(-)

diff --git a/internal/server/mock/metrics/server.go b/internal/server/mock/metrics/server.go
index 6d7fc2f..f17baf9 100644
--- a/internal/server/mock/metrics/server.go
+++ b/internal/server/mock/metrics/server.go
@@ -19,42 +19,42 @@ type Server struct {
 }
 
 type MockMetric struct {
-	Min         float64
-	Max         float64
-	Application bool
+	Min    float64
+	Max    float64
+	Source pb.MetricSource
 }
 
 // metricData is built once at package initialization
 var metricData = map[pb.MetricType]map[string]MockMetric{
 	pb.MetricType_CLUSTER: {
-		"requests":            {250_000, 4_000_000, false},
-		"httpcode_target_200": {500, 1_000, false},
-		"httpcode_target_300": {25, 50, false},
-		"httpcode_target_400": {10, 25, false},
-		"httpcode_target_500": {0, 10, false},
+		"requests":            {250_000, 4_000_000, pb.MetricSource_SYSTEM},
+		"httpcode_target_200": {500, 1_000, pb.MetricSource_SYSTEM},
+		"httpcode_target_300": {25, 50, pb.MetricSource_SYSTEM},
+		"httpcode_target_400": {10, 25, pb.MetricSource_SYSTEM},
+		"httpcode_target_500": {0, 10, pb.MetricSource_SYSTEM},
 	},
 	pb.MetricType_ENVIRONMENT: {
-		"requests":              {25_000, 200_000, false},
-		"cpu":                   {25, 100, false},
-		"memory":                {512_000, 4_294_967_296, false}, // 512KB to 4GB
-		"replicas":              {2, 8, false},
-		"php_active":            {4, 48, false},
-		"php_idle":              {2, 12, false},
-		"php_queued":            {0, 8, false},
-		"cache_hit_rate":        {60, 99, false},
-		"invalidation_paths":    {10, 50, false},
-		"invalidation_requests": {5, 20, false},
-		"origin_errors":         {0, 10, false},
-		"httpcode_target_200":   {200, 500, false},
-		"httpcode_target_300":   {25, 50, false},
-		"httpcode_target_400":   {10, 25, false},
-		"httpcode_target_500":   {0, 10, false},
-		"response_times_avg":    {0.1, 0.25, false},
-		"response_times_p95":    {2.0, 5.0, false},
-		"response_times_p99":    {10.0, 20.0, false},
-		"mock_application_1":    {0, 100, true},
-		"mock_application_2":    {0.3, 1.4, true},
-		"mock_application_3":    {0, 100_000_000, true},
+		"requests":              {25_000, 200_000, pb.MetricSource_SYSTEM},
+		"cpu":                   {25, 100, pb.MetricSource_SYSTEM},
+		"memory":                {512_000, 4_294_967_296, pb.MetricSource_SYSTEM}, // 512KB to 4GB
+		"replicas":              {2, 8, pb.MetricSource_SYSTEM},
+		"php_active":            {4, 48, pb.MetricSource_SYSTEM},
+		"php_idle":              {2, 12, pb.MetricSource_SYSTEM},
+		"php_queued":            {0, 8, pb.MetricSource_SYSTEM},
+		"cache_hit_rate":        {60, 99, pb.MetricSource_SYSTEM},
+		"invalidation_paths":    {10, 50, pb.MetricSource_SYSTEM},
+		"invalidation_requests": {5, 20, pb.MetricSource_SYSTEM},
+		"origin_errors":         {0, 10, pb.MetricSource_SYSTEM},
+		"httpcode_target_200":   {200, 500, pb.MetricSource_SYSTEM},
+		"httpcode_target_300":   {25, 50, pb.MetricSource_SYSTEM},
+		"httpcode_target_400":   {10, 25, pb.MetricSource_SYSTEM},
+		"httpcode_target_500":   {0, 10, pb.MetricSource_SYSTEM},
+		"response_times_avg":    {0.1, 0.25, pb.MetricSource_SYSTEM},
+		"response_times_p95":    {2.0, 5.0, pb.MetricSource_SYSTEM},
+		"response_times_p99":    {10.0, 20.0, pb.MetricSource_SYSTEM},
+		"mock_application_1":    {0, 100, pb.MetricSource_APPLICATION},
+		"mock_application_2":    {0.3, 1.4, pb.MetricSource_APPLICATION},
+		"mock_application_3":    {0, 100_000_000, pb.MetricSource_APPLICATION},
 	},
 }
 
@@ -80,15 +80,16 @@ func (s *Server) AvailableMetrics(ctx context.Context, req *pb.AvailableMetricsR
 
 	availableMetrics := []*pb.MetricDefinition{}
 	for key, metric := range mappings {
-		source := pb.MetricSource_SYSTEM
-		if metric.Application {
-			source = pb.MetricSource_APPLICATION
+		// Hide application metrics for the prod environment.
+		if req.Environment != nil && *req.Environment == "prod" && metric.Source == pb.MetricSource_APPLICATION {
+			continue
 		}
+
 		availableMetrics = append(availableMetrics, &pb.MetricDefinition{
 			Name:   key,
 			Type:   req.Type,
 			Title:  strings.ReplaceAll(key, "_", " "),
-			Source: source,
+			Source: metric.Source,
 		})
 	}
 
diff --git a/metrics.proto b/metrics.proto
index 7653576..55e9b03 100644
--- a/metrics.proto
+++ b/metrics.proto
@@ -35,7 +35,7 @@ enum MetricSource {
 message AvailableMetricsRequest {
   MetricType type = 1; // The type of the metric.
   optional string environment = 2; // Name of the environment. Required when using ENVIRONMENT type.
-  optional bool application = 3; // Whether to return application metrics or not. Unset for both.
+  optional MetricSource source = 3; // Whether to return only metrics with a specific source.
 }
 
 /**
diff --git a/pb/metrics.pb.go b/pb/metrics.pb.go
index b08d3ac..8e0af60 100644
--- a/pb/metrics.pb.go
+++ b/pb/metrics.pb.go
@@ -133,9 +133,9 @@ type AvailableMetricsRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Type        MetricType `protobuf:"varint,1,opt,name=type,proto3,enum=workflow.MetricType" json:"type,omitempty"` // The type of the metric.
-	Environment *string    `protobuf:"bytes,2,opt,name=environment,proto3,oneof" json:"environment,omitempty"`       // Name of the environment. Required when using ENVIRONMENT type.
-	Application *bool      `protobuf:"varint,3,opt,name=application,proto3,oneof" json:"application,omitempty"`      // Whether to return application metrics or not. Unset for both.
+	Type        MetricType    `protobuf:"varint,1,opt,name=type,proto3,enum=workflow.MetricType" json:"type,omitempty"`             // The type of the metric.
+	Environment *string       `protobuf:"bytes,2,opt,name=environment,proto3,oneof" json:"environment,omitempty"`                   // Name of the environment. Required when using ENVIRONMENT type.
+	Source      *MetricSource `protobuf:"varint,3,opt,name=source,proto3,enum=workflow.MetricSource,oneof" json:"source,omitempty"` // Whether to return only metrics with a specific source.
 }
 
 func (x *AvailableMetricsRequest) Reset() {
@@ -184,11 +184,11 @@ func (x *AvailableMetricsRequest) GetEnvironment() string {
 	return ""
 }
 
-func (x *AvailableMetricsRequest) GetApplication() bool {
-	if x != nil && x.Application != nil {
-		return *x.Application
+func (x *AvailableMetricsRequest) GetSource() MetricSource {
+	if x != nil && x.Source != nil {
+		return *x.Source
 	}
-	return false
+	return MetricSource_METRIC_SOURCE_UNSPECIFIED
 }
 
 // *
@@ -506,84 +506,84 @@ var file_metrics_proto_rawDesc = []byte{
 	0x0a, 0x0d, 0x6d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12,
 	0x08, 0x77, 0x6f, 0x72, 0x6b, 0x66, 0x6c, 0x6f, 0x77, 0x1a, 0x1f, 0x67, 0x6f, 0x6f, 0x67, 0x6c,
 	0x65, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2f, 0x74, 0x69, 0x6d, 0x65, 0x73,
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+	0x74, 0x61, 0x6d, 0x70, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0xba, 0x01, 0x0a, 0x17, 0x41,
 	0x76, 0x61, 0x69, 0x6c, 0x61, 0x62, 0x6c, 0x65, 0x4d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73, 0x52,
 	0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x12, 0x28, 0x0a, 0x04, 0x74, 0x79, 0x70, 0x65, 0x18, 0x01,
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 }
 
 var (
@@ -613,23 +613,24 @@ var file_metrics_proto_goTypes = []interface{}{
 }
 var file_metrics_proto_depIdxs = []int32{
 	0,  // 0: workflow.AvailableMetricsRequest.type:type_name -> workflow.MetricType
-	4,  // 1: workflow.AvailableMetricsResponse.metrics:type_name -> workflow.MetricDefinition
-	0,  // 2: workflow.MetricDefinition.type:type_name -> workflow.MetricType
-	1,  // 3: workflow.MetricDefinition.source:type_name -> workflow.MetricSource
-	0,  // 4: workflow.AbsoluteRangeRequest.type:type_name -> workflow.MetricType
-	8,  // 5: workflow.AbsoluteRangeRequest.start_time:type_name -> google.protobuf.Timestamp
-	8,  // 6: workflow.AbsoluteRangeRequest.end_time:type_name -> google.protobuf.Timestamp
-	7,  // 7: workflow.AbsoluteRangeResponse.metrics:type_name -> workflow.MetricValue
-	8,  // 8: workflow.MetricValue.timestamp:type_name -> google.protobuf.Timestamp
-	2,  // 9: workflow.metrics.AvailableMetrics:input_type -> workflow.AvailableMetricsRequest
-	5,  // 10: workflow.metrics.AbsoluteRange:input_type -> workflow.AbsoluteRangeRequest
-	3,  // 11: workflow.metrics.AvailableMetrics:output_type -> workflow.AvailableMetricsResponse
-	6,  // 12: workflow.metrics.AbsoluteRange:output_type -> workflow.AbsoluteRangeResponse
-	11, // [11:13] is the sub-list for method output_type
-	9,  // [9:11] is the sub-list for method input_type
-	9,  // [9:9] is the sub-list for extension type_name
-	9,  // [9:9] is the sub-list for extension extendee
-	0,  // [0:9] is the sub-list for field type_name
+	1,  // 1: workflow.AvailableMetricsRequest.source:type_name -> workflow.MetricSource
+	4,  // 2: workflow.AvailableMetricsResponse.metrics:type_name -> workflow.MetricDefinition
+	0,  // 3: workflow.MetricDefinition.type:type_name -> workflow.MetricType
+	1,  // 4: workflow.MetricDefinition.source:type_name -> workflow.MetricSource
+	0,  // 5: workflow.AbsoluteRangeRequest.type:type_name -> workflow.MetricType
+	8,  // 6: workflow.AbsoluteRangeRequest.start_time:type_name -> google.protobuf.Timestamp
+	8,  // 7: workflow.AbsoluteRangeRequest.end_time:type_name -> google.protobuf.Timestamp
+	7,  // 8: workflow.AbsoluteRangeResponse.metrics:type_name -> workflow.MetricValue
+	8,  // 9: workflow.MetricValue.timestamp:type_name -> google.protobuf.Timestamp
+	2,  // 10: workflow.metrics.AvailableMetrics:input_type -> workflow.AvailableMetricsRequest
+	5,  // 11: workflow.metrics.AbsoluteRange:input_type -> workflow.AbsoluteRangeRequest
+	3,  // 12: workflow.metrics.AvailableMetrics:output_type -> workflow.AvailableMetricsResponse
+	6,  // 13: workflow.metrics.AbsoluteRange:output_type -> workflow.AbsoluteRangeResponse
+	12, // [12:14] is the sub-list for method output_type
+	10, // [10:12] is the sub-list for method input_type
+	10, // [10:10] is the sub-list for extension type_name
+	10, // [10:10] is the sub-list for extension extendee
+	0,  // [0:10] is the sub-list for field type_name
 }
 
 func init() { file_metrics_proto_init() }