Fix broken promscale_packager telemetry field for docker envs.

Signed-off-by: Harkishen-Singh <harkishensingh@hotmail.com>

This commits fixes the `promscale_packager` telemetry field that was
earlier showing `unknown` for all docker deployments. Now, it will show
`promscale_packager: docker` in the `_timescaledb_catalog.metadata`
table.

CHANGELOG.md

@@ -17,6 +17,9 @@ We use the following categories for changes:
 ### Added
 - Add support to instrument Promscale's Otel GRPC server with Prometheus metrics [#1061]
 
+### Fixed
+- Fix broken `promscale_packager` telemetry field for docker envs [#1077]
+
 ## [0.8.0] - 2022-01-18
 
 ### Added

build/Dockerfile

@@ -17,6 +17,7 @@ RUN GIT_COMMIT=$(git rev-list -1 HEAD) \
 
 # Final image
 FROM busybox
+ENV PROMSCALE_PKG=docker
 LABEL maintainer="Timescale https://www.timescale.com"
 COPY --from=builder /bin/promscale /
 ENTRYPOINT ["/promscale"]

pkg/telemetry/metadata.go

@@ -61,12 +61,10 @@ func turnOffPackageLogging() {
 
 func getPkgEnv() string {
 	pkg := os.Getenv("PROMSCALE_PKG")
-	switch pkg {
-	case "deb", "rpm", "apk":
-		return pkg
-	default:
-		return "unknown"
+	if pkg == "" {
+		pkg = "unknown"
 	}
+	return pkg
 }
 
 func toString(prop []byte) string {