diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 00000000..b0fbd4ea
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+/console/src/protos/**/* linguist-generated=true
diff --git a/common/rpc/metadata.go b/common/rpc/observability.go
similarity index 100%
rename from common/rpc/metadata.go
rename to common/rpc/observability.go
diff --git a/console/src/protos/xyz/block/ftl/v1/ftl_pb.ts b/console/src/protos/xyz/block/ftl/v1/ftl_pb.ts
index 7ce73a1f..170a9e55 100644
--- a/console/src/protos/xyz/block/ftl/v1/ftl_pb.ts
+++ b/console/src/protos/xyz/block/ftl/v1/ftl_pb.ts
@@ -964,15 +964,22 @@ export class GetDeploymentResponse extends Message<GetDeploymentResponse> {
  * @generated from message xyz.block.ftl.v1.RegisterRunnerRequest
  */
 export class RegisterRunnerRequest extends Message<RegisterRunnerRequest> {
+  /**
+   * UUID representing the runner instance.
+   *
+   * @generated from field: string key = 1;
+   */
+  key = "";
+
   /**
    * Language the runner supports.
    *
-   * @generated from field: string language = 1;
+   * @generated from field: string language = 2;
    */
   language = "";
 
   /**
-   * @generated from field: string endpoint = 2;
+   * @generated from field: string endpoint = 3;
    */
   endpoint = "";
 
@@ -984,8 +991,9 @@ export class RegisterRunnerRequest extends Message<RegisterRunnerRequest> {
   static readonly runtime: typeof proto3 = proto3;
   static readonly typeName = "xyz.block.ftl.v1.RegisterRunnerRequest";
   static readonly fields: FieldList = proto3.util.newFieldList(() => [
-    { no: 1, name: "language", kind: "scalar", T: 9 /* ScalarType.STRING */ },
-    { no: 2, name: "endpoint", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+    { no: 1, name: "key", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+    { no: 2, name: "language", kind: "scalar", T: 9 /* ScalarType.STRING */ },
+    { no: 3, name: "endpoint", kind: "scalar", T: 9 /* ScalarType.STRING */ },
   ]);
 
   static fromBinary(bytes: Uint8Array, options?: Partial<BinaryReadOptions>): RegisterRunnerRequest {
diff --git a/controlplane/controlplane.go b/controlplane/controlplane.go
index 62abd524..5ad36431 100644
--- a/controlplane/controlplane.go
+++ b/controlplane/controlplane.go
@@ -76,19 +76,14 @@ type Service struct {
 }
 
 func New(ctx context.Context, dal *dal.DAL, heartbeatTimeout time.Duration, artefactChunkSize int) (*Service, error) {
-	logger := log.FromContext(ctx)
-	count, err := dal.DeleteStaleRunners(context.Background(), heartbeatTimeout)
-	if err != nil {
-		return nil, errors.Wrap(err, "failed to delete stale runners")
-	}
-	logger.Warnf("Deleted %d stale runners", count)
-	return &Service{
+	svc := &Service{
 		dal:               dal,
 		heartbeatTimeout:  heartbeatTimeout,
 		artefactChunkSize: artefactChunkSize,
-	}, nil
+	}
+	go svc.reapStaleRunners(ctx)
+	return svc, nil
 }
-
 func (s *Service) Deploy(ctx context.Context, req *connect.Request[ftlv1.DeployRequest]) (*connect.Response[ftlv1.DeployResponse], error) {
 	panic("unimplemented")
 }
@@ -110,6 +105,10 @@ func (s *Service) RegisterRunner(ctx context.Context, req *connect.ClientStream[
 	if endpoint.Scheme != "http" && endpoint.Scheme != "https" {
 		return nil, connect.NewError(connect.CodeUnavailable, errors.Errorf("invalid endpoint scheme %q", endpoint.Scheme))
 	}
+	key, err := uuid.Parse(msg.Key)
+	if err != nil {
+		return nil, connect.NewError(connect.CodeFailedPrecondition, errors.Wrap(err, "invalid key"))
+	}
 
 	// Check if we can contact the runner.
 	client := rpc.Dial(ftlv1connect.NewRunnerServiceClient, endpoint.String())
@@ -119,7 +118,7 @@ func (s *Service) RegisterRunner(ctx context.Context, req *connect.ClientStream[
 		return nil, connect.NewError(connect.CodeUnavailable, errors.Wrap(err, "failed to connect to runner"))
 	}
 
-	runnerID, err := s.dal.RegisterRunner(ctx, msg.Language, endpoint)
+	runnerID, err := s.dal.RegisterRunner(ctx, key, msg.Language, endpoint)
 	if errors.Is(err, dal.ErrConflict) {
 		return nil, connect.NewError(connect.CodeAlreadyExists, err)
 	} else if err != nil {
@@ -302,3 +301,21 @@ func (s *Service) getDeployment(ctx context.Context, key string) (*dal.Deploymen
 	}
 	return deployment, nil
 }
+
+func (s *Service) reapStaleRunners(ctx context.Context) {
+	logger := log.FromContext(ctx)
+	for {
+		count, err := s.dal.DeleteStaleRunners(context.Background(), s.heartbeatTimeout)
+		if err != nil {
+			logger.Errorf(err, "Failed to delete stale runners")
+		} else if count > 0 {
+			logger.Warnf("Deleted %d stale runners", count)
+		}
+		select {
+		case <-ctx.Done():
+			return
+
+		case <-time.After(s.heartbeatTimeout):
+		}
+	}
+}
diff --git a/controlplane/controlplane_test.go b/controlplane/controlplane_test.go
index 3869ee81..16a2f2ef 100644
--- a/controlplane/controlplane_test.go
+++ b/controlplane/controlplane_test.go
@@ -11,6 +11,7 @@ import (
 	"github.com/alecthomas/concurrency"
 	connect "github.com/bufbuild/connect-go"
 	grpcreflect "github.com/bufbuild/connect-grpcreflect-go"
+	"github.com/google/uuid"
 	"github.com/jpillora/backoff"
 
 	"github.com/TBD54566975/ftl/common/log"
@@ -26,7 +27,9 @@ func TestControlPlaneRegisterRunnerHeartbeatClose(t *testing.T) {
 
 	stream := client.RegisterRunner(ctx)
 	t.Cleanup(func() { _, _ = stream.CloseAndReceive() })
+	key := uuid.NewString()
 	err := stream.Send(&ftlv1.RegisterRunnerRequest{
+		Key:      key,
 		Language: "go",
 		Endpoint: bind.String(),
 	})
@@ -34,6 +37,7 @@ func TestControlPlaneRegisterRunnerHeartbeatClose(t *testing.T) {
 	time.Sleep(time.Millisecond * 100)
 
 	err = stream.Send(&ftlv1.RegisterRunnerRequest{
+		Key:      key,
 		Language: "go",
 		Endpoint: bind.String(),
 	})
@@ -54,8 +58,10 @@ func TestControlPlaneRegisterRunnerHeartbeatClose(t *testing.T) {
 func TestControlPlaneRegisterRunnerHeartbeatTimeout(t *testing.T) {
 	db, client, bind, ctx := startForTesting(t)
 
+	key := uuid.NewString()
 	stream := client.RegisterRunner(ctx)
 	err := stream.Send(&ftlv1.RegisterRunnerRequest{
+		Key:      key,
 		Language: "go",
 		Endpoint: bind.String(),
 	})
diff --git a/controlplane/internal/dal/dal.go b/controlplane/internal/dal/dal.go
index 357c77da..b99235a3 100644
--- a/controlplane/internal/dal/dal.go
+++ b/controlplane/internal/dal/dal.go
@@ -205,8 +205,8 @@ type RunnerID int64
 // RegisterRunner registers a new runner.
 //
 // It will return ErrConflict if a runner with the same endpoint already exists.
-func (d *DAL) RegisterRunner(ctx context.Context, language string, endpoint *url.URL) (RunnerID, error) {
-	id, err := d.db.RegisterRunner(ctx, language, endpoint.String())
+func (d *DAL) RegisterRunner(ctx context.Context, key uuid.UUID, language string, endpoint *url.URL) (RunnerID, error) {
+	id, err := d.db.RegisterRunner(ctx, key, language, endpoint.String())
 	if isPGConflict(err) {
 		return 0, errors.Wrap(ErrConflict, "runner already registered")
 	}
diff --git a/controlplane/internal/sql/models.go b/controlplane/internal/sql/models.go
index ac765d2f..0ce90aa7 100644
--- a/controlplane/internal/sql/models.go
+++ b/controlplane/internal/sql/models.go
@@ -40,6 +40,7 @@ type Module struct {
 
 type Runner struct {
 	ID           int64
+	Key          uuid.UUID
 	LastSeen     pgtype.Timestamp
 	Language     string
 	Endpoint     string
diff --git a/controlplane/internal/sql/querier.go b/controlplane/internal/sql/querier.go
index 46abfa69..3f40bb0f 100644
--- a/controlplane/internal/sql/querier.go
+++ b/controlplane/internal/sql/querier.go
@@ -35,7 +35,7 @@ type Querier interface {
 	// Get all runners that are assigned to run the given module.
 	GetRunnersForModule(ctx context.Context, name string) ([]GetRunnersForModuleRow, error)
 	HeartbeatRunner(ctx context.Context, id int64) error
-	RegisterRunner(ctx context.Context, language string, endpoint string) (int64, error)
+	RegisterRunner(ctx context.Context, key uuid.UUID, language string, endpoint string) (int64, error)
 }
 
 var _ Querier = (*Queries)(nil)
diff --git a/controlplane/internal/sql/queries.sql b/controlplane/internal/sql/queries.sql
index dca2ea3d..6816ccf4 100644
--- a/controlplane/internal/sql/queries.sql
+++ b/controlplane/internal/sql/queries.sql
@@ -70,7 +70,8 @@ FROM artefacts a
 WHERE a.id = @id;
 
 -- name: RegisterRunner :one
-INSERT INTO runners (language, endpoint) VALUES ($1, $2)
+INSERT INTO runners (key, language, endpoint) VALUES ($1, $2, $3)
+ON CONFLICT (key) DO UPDATE SET language = $2, endpoint = $3
 RETURNING id;
 
 -- name: DeleteStaleRunners :one
diff --git a/controlplane/internal/sql/queries.sql.go b/controlplane/internal/sql/queries.sql.go
index 3757c470..3a731a7f 100644
--- a/controlplane/internal/sql/queries.sql.go
+++ b/controlplane/internal/sql/queries.sql.go
@@ -89,7 +89,7 @@ const deleteStaleRunners = `-- name: DeleteStaleRunners :one
 WITH deleted AS (
   DELETE FROM runners
   WHERE last_seen < (NOW() AT TIME ZONE 'utc') - $1::INTERVAL
-  RETURNING id, last_seen, language, endpoint, deployment_id
+  RETURNING id, key, last_seen, language, endpoint, deployment_id
 )
 SELECT COUNT(*) FROM deleted
 `
@@ -308,7 +308,7 @@ func (q *Queries) GetDeploymentsWithArtefacts(ctx context.Context, digests [][]b
 }
 
 const getIdleRunnersForLanguage = `-- name: GetIdleRunnersForLanguage :many
-SELECT id, last_seen, language, endpoint, deployment_id FROM runners
+SELECT id, key, last_seen, language, endpoint, deployment_id FROM runners
 WHERE language = $1
   AND deployment_id IS NULL
 `
@@ -324,6 +324,7 @@ func (q *Queries) GetIdleRunnersForLanguage(ctx context.Context, language string
 		var i Runner
 		if err := rows.Scan(
 			&i.ID,
+			&i.Key,
 			&i.LastSeen,
 			&i.Language,
 			&i.Endpoint,
@@ -398,7 +399,7 @@ func (q *Queries) GetModulesByID(ctx context.Context, ids []int64) ([]Module, er
 }
 
 const getRunnersForModule = `-- name: GetRunnersForModule :many
-SELECT r.id, r.last_seen, r.language, r.endpoint, r.deployment_id, d.key AS deployment_key, m.id AS module_id, m.name AS module_name
+SELECT r.id, r.key, r.last_seen, r.language, r.endpoint, r.deployment_id, d.key AS deployment_key, m.id AS module_id, m.name AS module_name
 FROM runners r
 JOIN deployments d ON r.deployment_id = d.id
 JOIN modules m ON d.module_id = m.id
@@ -407,6 +408,7 @@ WHERE m.name = $1
 
 type GetRunnersForModuleRow struct {
 	ID            int64
+	Key           uuid.UUID
 	LastSeen      pgtype.Timestamp
 	Language      string
 	Endpoint      string
@@ -428,6 +430,7 @@ func (q *Queries) GetRunnersForModule(ctx context.Context, name string) ([]GetRu
 		var i GetRunnersForModuleRow
 		if err := rows.Scan(
 			&i.ID,
+			&i.Key,
 			&i.LastSeen,
 			&i.Language,
 			&i.Endpoint,
@@ -456,12 +459,13 @@ func (q *Queries) HeartbeatRunner(ctx context.Context, id int64) error {
 }
 
 const registerRunner = `-- name: RegisterRunner :one
-INSERT INTO runners (language, endpoint) VALUES ($1, $2)
+INSERT INTO runners (key, language, endpoint) VALUES ($1, $2, $3)
+ON CONFLICT (key) DO UPDATE SET language = $2, endpoint = $3
 RETURNING id
 `
 
-func (q *Queries) RegisterRunner(ctx context.Context, language string, endpoint string) (int64, error) {
-	row := q.db.QueryRow(ctx, registerRunner, language, endpoint)
+func (q *Queries) RegisterRunner(ctx context.Context, key uuid.UUID, language string, endpoint string) (int64, error) {
+	row := q.db.QueryRow(ctx, registerRunner, key, language, endpoint)
 	var id int64
 	err := row.Scan(&id)
 	return id, err
diff --git a/controlplane/internal/sql/schema/001_init.sql b/controlplane/internal/sql/schema/001_init.sql
index 9658c0a5..f7ceb82f 100644
--- a/controlplane/internal/sql/schema/001_init.sql
+++ b/controlplane/internal/sql/schema/001_init.sql
@@ -41,6 +41,8 @@ CREATE INDEX deployment_artefacts_deployment_id_idx ON deployment_artefacts (dep
 -- Runners are processes that are available to run modules.
 CREATE TABLE runners (
   id BIGSERIAL PRIMARY KEY NOT NULL,
+  -- Unique identifier for this runner, generated at startup.
+  key UUID UNIQUE NOT NULL,
   last_seen TIMESTAMP WITHOUT TIME ZONE NOT NULL DEFAULT (NOW() AT TIME ZONE 'utc'),
   language VARCHAR(64) NOT NULL,
   endpoint VARCHAR(255) UNIQUE NOT NULL,
diff --git a/protos/xyz/block/ftl/v1/ftl.pb.go b/protos/xyz/block/ftl/v1/ftl.pb.go
index 3f053090..8415b19f 100644
--- a/protos/xyz/block/ftl/v1/ftl.pb.go
+++ b/protos/xyz/block/ftl/v1/ftl.pb.go
@@ -1142,9 +1142,11 @@ type RegisterRunnerRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
+	// UUID representing the runner instance.
+	Key string `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
 	// Language the runner supports.
-	Language string `protobuf:"bytes,1,opt,name=language,proto3" json:"language,omitempty"`
-	Endpoint string `protobuf:"bytes,2,opt,name=endpoint,proto3" json:"endpoint,omitempty"`
+	Language string `protobuf:"bytes,2,opt,name=language,proto3" json:"language,omitempty"`
+	Endpoint string `protobuf:"bytes,3,opt,name=endpoint,proto3" json:"endpoint,omitempty"`
 }
 
 func (x *RegisterRunnerRequest) Reset() {
@@ -1179,6 +1181,13 @@ func (*RegisterRunnerRequest) Descriptor() ([]byte, []int) {
 	return file_xyz_block_ftl_v1_ftl_proto_rawDescGZIP(), []int{22}
 }
 
+func (x *RegisterRunnerRequest) GetKey() string {
+	if x != nil {
+		return x.Key
+	}
+	return ""
+}
+
 func (x *RegisterRunnerRequest) GetLanguage() string {
 	if x != nil {
 		return x.Language
@@ -1631,122 +1640,123 @@ var file_xyz_block_ftl_v1_ftl_proto_rawDesc = []byte{
 	0x28, 0x0b, 0x32, 0x24, 0x2e, 0x78, 0x79, 0x7a, 0x2e, 0x62, 0x6c, 0x6f, 0x63, 0x6b, 0x2e, 0x66,
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 }
 
 var (
diff --git a/protos/xyz/block/ftl/v1/ftl.proto b/protos/xyz/block/ftl/v1/ftl.proto
index 4bdf250c..61b4e4fb 100644
--- a/protos/xyz/block/ftl/v1/ftl.proto
+++ b/protos/xyz/block/ftl/v1/ftl.proto
@@ -134,9 +134,11 @@ message GetDeploymentResponse {
 }
 
 message RegisterRunnerRequest {
+  // UUID representing the runner instance.
+  string key = 1;
   // Language the runner supports.
-  string language = 1;
-  string endpoint = 2;
+  string language = 2;
+  string endpoint = 3;
 }
 message RegisterRunnerResponse {}
 
diff --git a/runner-go/runner.go b/runner-go/runner.go
index 7cf67cee..d98cf63f 100644
--- a/runner-go/runner.go
+++ b/runner-go/runner.go
@@ -54,6 +54,7 @@ func Start(ctx context.Context, config Config) error {
 	controlplaneClient := rpc.Dial(ftlv1connect.NewControlPlaneServiceClient, config.FTLEndpoint.String())
 
 	svc := &Service{
+		key:                uuid.New(),
 		config:             config,
 		controlplaneClient: controlplaneClient,
 	}
@@ -79,6 +80,7 @@ type pluginProxy struct {
 }
 
 type Service struct {
+	key uuid.UUID
 	// We use double-checked locking around the atomic so that the read fast-path is lock-free.
 	lock       sync.Mutex
 	deployment atomic.Value[*pluginProxy]
@@ -176,6 +178,7 @@ func (s *Service) registrationLoop(ctx context.Context) {
 			defer func() { s.registrationFailure.Store(types.Some(err)) }()
 			for {
 				err := stream.Send(&ftlv1.RegisterRunnerRequest{
+					Key:      s.key.String(),
 					Language: "go",
 					Endpoint: s.config.Endpoint.String(),
 				})