cloud/bmaas/bmdb: implement BMDB client metrics

This implements some basic BMDB metrics exported by any client code
using the BMDB.

It also enables their use in the Shepherd and BMSRV.

Change-Id: I1d5e82fd2c34a7bfd42f37fad540d69f7b23f347
Reviewed-on: https://review.monogon.dev/c/monogon/+/1600
Tested-by: Jenkins CI
Reviewed-by: Tim Windelschmidt <tim@monogon.tech>
diff --git a/cloud/bmaas/server/BUILD.bazel b/cloud/bmaas/server/BUILD.bazel
index 4303d62..18e72b5 100644
--- a/cloud/bmaas/server/BUILD.bazel
+++ b/cloud/bmaas/server/BUILD.bazel
@@ -10,6 +10,7 @@
     visibility = ["//visibility:public"],
     deps = [
         "//cloud/bmaas/bmdb",
+        "//cloud/bmaas/bmdb/metrics",
         "//cloud/bmaas/bmdb/model",
         "//cloud/bmaas/bmdb/webug",
         "//cloud/bmaas/server/api",