Opentelemetry changes for Petasos (#67)

* Opentelemetry changes for Petasos

* Opentelemetry changes for Petasos

* Opentelemetry changes with Optional Tracing

* Opentelemetry integration with optional tracing

* Apply suggestions from code review

* match config section from other services

Co-authored-by: Joel Unzain <joe94@users.noreply.github.com>

deploy/packaging/petasos_spruce.yaml

@@ -294,3 +294,17 @@ service:
         # (Optional) defaults to empty struct
         # queryOptions:
         #   useCache: true
+
+# tracing provides configuration around traces using OpenTelemetry.
+# (Optional). By default, a 'noop' tracer provider is used and tracing is disabled.
+tracing:
+  # provider is the provider name. Currently, stdout, jaegar and zipkin are supported.
+  # 'noop' can also be used as provider to explicitly disable tracing.
+  provider: (( grab $TRACING_PROVIDER_NAME || "noop" ))
+
+  # skipTraceExport only applies when provider is stdout. Set skipTraceExport to true
+  # so that trace information is not written to stdout.
+  # skipTraceExport: true
+
+  # endpoint is where trace information should be routed. Applies to zipkin and jaegar.
+  endpoint: (( grab $TRACING_PROVIDER_ENDPOINT || "http://zipkin:9411/api/v2/spans" ))

go.mod

@@ -4,11 +4,15 @@ go 1.12
 
 require (
 	github.com/c9s/goprocinfo v0.0.0-20190309065803-0b2ad9ac246b // indirect
-	github.com/go-kit/kit v0.9.0
-	github.com/influxdata/influxdb1-client v0.0.0-20191209144304-8bf82d3c094d // indirect
+	github.com/go-kit/kit v0.10.0
+	github.com/gorilla/mux v1.8.0 // indirect
 	github.com/justinas/alice v1.2.0
 	github.com/spaolacci/murmur3 v1.1.0 // indirect
-	github.com/spf13/pflag v1.0.3
-	github.com/spf13/viper v1.6.1
-	github.com/xmidt-org/webpa-common v1.10.0
+	github.com/spf13/pflag v1.0.5
+	github.com/spf13/viper v1.7.1
+	github.com/xmidt-org/candlelight v0.0.4
+	github.com/xmidt-org/webpa-common v1.11.6
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.19.0
+	go.opentelemetry.io/otel v0.19.0
+	go.opentelemetry.io/otel/trace v0.19.0
 )