MB-68795: Log time spent in DeleteFusionNamespace

Unfortunately, magma/fusion does not have a global logger. Their loggers
are tied to a bucket instance. Fortunately, KV does have one.

This patch captures the time spent in DeleteFusionNamespace call to
track how long S3 takes to clear away all the log files.

Change-Id: Ie7622b5a0b34d2e87c4a71c7aad62addb182bb30
Reviewed-on: https://review.couchbase.org/c/kv_engine/+/235319
Tested-by: Build Bot <[email protected]>
Reviewed-by: Rohan Suri <[email protected]>
Reviewed-by: Trond Norbye <[email protected]>

Author: mohammadzaeem

daemon/protocol/mcbp/delete_fusion_namespace_command_context.cc

@@ -32,15 +32,23 @@ cb::engine_errc DeleteFusionNamespaceCommandContext::execute() {
     const auto metadatastore = request["metadatastore_uri"];
     const auto token = request["metadatastore_auth_token"];
     const auto ns = request["namespace"];
+    const auto start = std::chrono::steady_clock::now();
     const auto status = magma::Magma::DeleteFusionNamespace(
             logstore, metadatastore, token, ns);
+    const auto stop = std::chrono::steady_clock::now();
     if (status.IsOK()) {
+        LOG_INFO_CTX("DeleteFusionNamespace",
+                     {"logstore_uri", logstore},
+                     {"metadatastore_uri", metadatastore},
+                     {"namespace", ns},
+                     {"duration", stop - start});
         return cb::engine_errc::success;
     }
     LOG_WARNING_CTX("DeleteFusionNamespace",
                     {"logstore_uri", logstore},
                     {"metadatastore_uri", metadatastore},
                     {"namespace", ns},
-                    {"error", status.String()});
+                    {"error", status.String()},
+                    {"duration", stop - start});
     return cb::engine_errc::failed;
 }