Update swap.go to only log once on startup if swap metrics can't be collected

Makefile

@@ -92,7 +92,7 @@ local-deb-package: ## Create local deb package
 
 local-rpm-package: ## Create local rpm package
 	GOWORK=off CGO_ENABLED=0 GOARCH=${LOCAL_ARCH} GOOS=linux go build -ldflags=${DEBUG_LDFLAGS} -o ./build/nginx-agent
-	VERSION=$(shell echo ${VERSION} | tr -d 'v') nfpm pkg --config ./scripts/.local-nfpm.yaml --packager rpm --target ./build/${PACKAGE_PREFIX}-$(shell echo ${VERSION} | tr -d 'v')-SNAPSHOT.rpm;
+	VERSION=$(shell echo ${VERSION} | tr -d 'v') nfpm pkg --config ./scripts/.local-nfpm.yaml --packager rpm --target ./build/${PACKAGE_PREFIX}-$(shell echo ${VERSION} | tr -d 'v')-SNAPSHOT-${COMMIT}.rpm;
 
 local-txz-package: ## Create local txz package
 	GOWORK=off CGO_ENABLED=0 GOARCH=${LOCAL_ARCH} GOOS=freebsd go build -ldflags=${DEBUG_LDFLAGS} -o ./build/nginx-agent

scripts/packages/packager/local-entrypoint.sh

@@ -19,7 +19,7 @@ cp build/nginx-agent /staging/usr/local/bin
 
 chmod +x /staging/usr/local/etc/rc.d/nginx-agent
 
-VERSION="$(git describe --match 'v[0-9]*' --abbrev=0 | tr -d 'v')-SNAPSHOT" envsubst < scripts/packages/manifest > /staging/+MANIFEST
+VERSION="$(git describe --match 'v[0-9]*' --abbrev=0 | tr -d 'v')-SNAPSHOT-$(git rev-parse --short HEAD)" envsubst < scripts/packages/manifest > /staging/+MANIFEST
 
 pkg -o ABI="FreeBSD:13:amd64" create --format txz  \
     -m /staging \
@@ -31,7 +31,7 @@ pkg -o ABI="FreeBSD:13:amd64" create --format txz  \
 # but since version 1.17.0 pkg will now always create a file with the extesion pkg no matter what the format is. 
 # See 1.17.0 release notes for more info: https://cgit.freebsd.org/ports/commit/?id=e497a16a286972bfcab908209b11ee6a13d99dc9
 cd build/
-ln -s nginx-agent-"$(git describe --match 'v[0-9]*' --abbrev=0 | tr -d 'v')"-SNAPSHOT.pkg nginx-agent-"$(git describe --match 'v[0-9]*' --abbrev=0 | tr -d 'v')"-SNAPSHOT.txz 
+ln -s nginx-agent-"$(git describe --match 'v[0-9]*' --abbrev=0 | tr -d 'v')"-SNAPSHOT-"$(git rev-parse --short HEAD)".pkg nginx-agent-"$(git describe --match 'v[0-9]*' --abbrev=0 | tr -d 'v')"-SNAPSHOT-"$(git rev-parse --short HEAD)".txz 
 cd ..
 
 rm -rf /staging

src/core/metrics/sources/swap.go

@@ -27,6 +27,15 @@ func NewSwapSource(namespace string, env core.Environment) *Swap {
 		statFunc = cgroupSwapSource.SwapMemoryStat
 	}
 
+	// Verify if swap metrics can be collected on startup
+	_, err := statFunc()
+	if err != nil {
+		if e, ok := err.(*os.PathError); ok {
+			log.Warnf("Unable to collect Swap metrics because the file %v was not found", e.Path)
+		}
+		log.Warnf("Unable to collect Swap metrics: %v", err)
+	}
+
 	return &Swap{&namedMetric{namespace, "swap"}, statFunc}
 }
 
@@ -35,10 +44,10 @@ func (c *Swap) Collect(ctx context.Context, wg *sync.WaitGroup, m chan<- *proto.
 	swapStats, err := c.statFunc()
 	if err != nil {
 		if e, ok := err.(*os.PathError); ok {
-			log.Warnf("Unable to collect Swap metrics because the file %v was not found", e.Path)
+			log.Debugf("Unable to collect Swap metrics because the file %v was not found", e.Path)
 			return
 		}
-		log.Errorf("Failed to collect Swap metrics: %v", err)
+		log.Debugf("Unable to collect Swap metrics: %v", err)
 		return
 	}