feat: instrument worker with OpenTelemetry (#50)

- Add Stats(...) method to JobProcessor to allow tracking counts of
  active and dead jobs by job type.
- Add JobProcessor middleware for OpenTelemetry instrumentation.
- Add middlewares to handlers for dead job managers's endpoints.
- Add histogram compass.worker.jobs.enqueue.duration with the following
  attributes:
  - job.types: ["index-asset", "delete-asset"]
  - operation.success: true/false
- Add gauge compass.worker.active_jobs with the following attributes:
  - job.type: index-asset/delete-asset
- Add histogram compass.worker.job.dequeue.latency with the following
  attributes:
  - job.type: index-asset/delete-asset
- Add histogram compass.worker.job.process.duration with the following
  attributes:
  - job.type: index-asset/delete-asset
  - job.attempt_number: 1/2
  - job.status: done/dead/retry
  - operation.success: true/false
- Add gauge compass.worker.dead_jobs with the following attributes:
  - job.type: index-asset/delete-asset

Makefile

@@ -65,7 +65,7 @@ proto: $(TOOLS_DIR)/buf ## Generate the protobuf files
 	@echo " > protobuf compilation finished"
 
 generate: $(TOOLS_DIR)/mockery ## Run all go generate in the code base
-	go generate ./...
+	PATH="$(TOOLS_DIR):${PATH}" go generate ./...
 
 clean:  ## Clean the build artifacts
 	rm -rf compass dist/

go.mod

@@ -38,6 +38,7 @@ require (
 	go.nhat.io/otelsql v0.11.0
 	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.42.0
 	go.opentelemetry.io/contrib/instrumentation/host v0.42.0
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.42.1-0.20230731182153-525d6c05bd62
 	go.opentelemetry.io/contrib/instrumentation/runtime v0.42.0
 	go.opentelemetry.io/contrib/samplers/probability/consistent v0.11.0
 	go.opentelemetry.io/otel v1.16.0
@@ -75,6 +76,7 @@ require (
 	github.com/docker/go-connections v0.4.0 // indirect
 	github.com/docker/go-units v0.4.0 // indirect
 	github.com/fatih/color v1.13.0 // indirect
+	github.com/felixge/httpsnoop v1.0.3 // indirect
 	github.com/fsnotify/fsnotify v1.5.4 // indirect
 	github.com/go-logr/logr v1.2.4 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect

go.sum

@@ -475,6 +475,8 @@ github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5Kwzbycv
 github.com/fatih/color v1.13.0 h1:8LOYc1KYPPmyKMuN8QV2DNRWNbLo6LZ0iLs8+mlH53w=
 github.com/fatih/color v1.13.0/go.mod h1:kLAiJbzzSOZDVNGyDpeOxJ47H46qBXwg5ILebYFFOfk=
 github.com/felixge/httpsnoop v1.0.1/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSwevea8zH2U=
+github.com/felixge/httpsnoop v1.0.3 h1:s/nj+GCswXYzN5v2DpNMuMQYe+0DDwt5WVCU6CWBdXk=
+github.com/felixge/httpsnoop v1.0.3/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSwevea8zH2U=
 github.com/fogleman/gg v1.2.1-0.20190220221249-0403632d5b90/go.mod h1:R/bRT+9gY/C5z7JzPU0zXsXHKM4/ayA+zqcVNZzPa1k=
 github.com/fogleman/gg v1.3.0/go.mod h1:R/bRT+9gY/C5z7JzPU0zXsXHKM4/ayA+zqcVNZzPa1k=
 github.com/form3tech-oss/jwt-go v3.2.2+incompatible/go.mod h1:pbq4aXjuKjdthFRnoDwaVPLA+WlJuPGy+QneDUgJi2k=
@@ -1419,6 +1421,8 @@ go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.4
 go.opentelemetry.io/contrib/instrumentation/host v0.42.0 h1:/GMlvboQJd4LWxNX/oGYLv06J5a/M/flauLruM/3U2g=
 go.opentelemetry.io/contrib/instrumentation/host v0.42.0/go.mod h1:w6v1mVemRjTTdfejACjf+LgVA6zKtHOWmdAIf3icx7A=
 go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.20.0/go.mod h1:2AboqHi0CiIZU0qwhtUfCYD1GeUzvvIXWNkhDt7ZMG4=
+go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.42.1-0.20230731182153-525d6c05bd62 h1:4Eb2RlvDQ9Gpp+qEsdUHa4cEX1NJdv/g9Y4MYprBqcw=
+go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.42.1-0.20230731182153-525d6c05bd62/go.mod h1:/Q7SZ3KqNy3qTGotS1MKC8lO5z0CFSeacGbjfgMa4sk=
 go.opentelemetry.io/contrib/instrumentation/runtime v0.42.0 h1:EbmAUG9hEAMXyfWEasIt2kmh/WmXUznUksChApTgBGc=
 go.opentelemetry.io/contrib/instrumentation/runtime v0.42.0/go.mod h1:rD9feqRYP24P14t5kmhNMqsqm1jvKmpx2H2rKVw52V8=
 go.opentelemetry.io/contrib/samplers/probability/consistent v0.11.0 h1:K4HJhe01GFkIo9JZ8iX1hMeI5MrkEMggXQM0YJamtEQ=