add local/ remote counters for SaplingBackingStore stats

Summary:
`getTree()`, `getRoorTree()`, `importManifestForRoot()`, `getBlob()`, `getBlobMetdata()` All of these functions get data from local or fom remote backing store. This diff add new counters to count the number of local/remote access which are happening for each of these functions.

## Note
This doc explains all the SaplingBackingStore ODS counters/duration after this stack changes: https://docs.google.com/document/d/1o355e8JGvq3fBYFD738Jkx9tPSWzH4bmxcM8YRKMziU/edit?usp=sharing

Reviewed By: jdelliot

Differential Revision: D56555571

fbshipit-source-id: a330bd3656d6cc7ec28a2b3dbcc835340910d592

eden/fs/store/BackingStoreLogger.cpp

@@ -70,6 +70,12 @@ void BackingStoreLogger::logImport(
     case ObjectFetchContext::ObjectType::Tree:
       typeString = "Tree";
       break;
+    case ObjectFetchContext::RootTree:
+      typeString = "Root Tree";
+      break;
+    case ObjectFetchContext::ManifestForRoot:
+      typeString = "Manifest For Root";
+      break;
     case ObjectFetchContext::ObjectType::kObjectTypeEnumMax:
       // invalid string prolly good here
       break;

eden/fs/store/ObjectFetchContext.h

@@ -14,6 +14,7 @@
 #include "eden/common/os/ProcessId.h"
 #include "eden/common/utils/RefPtr.h"
 #include "eden/fs/store/ImportPriority.h"
+#include "eden/fs/telemetry/EdenStats.h"
 
 namespace facebook::eden {
 
@@ -38,6 +39,8 @@ class ObjectFetchContext : public RefCounted {
     Blob,
     BlobMetadata,
     Tree,
+    RootTree,
+    ManifestForRoot,
     kObjectTypeEnumMax,
   };
 
@@ -109,7 +112,15 @@ class ObjectFetchContext : public RefCounted {
     return kDefaultImportPriority;
   }
 
-  void setFetchedSource(FetchedSource fetchedSource) {
+  void setFetchedSource(
+      FetchedSource fetchedSource,
+      ObjectType type,
+      EdenStatsPtr stats) {
+    // There is no stat increment for FetchedSource::Unknown
+    if (saplingStatsMap_.find({fetchedSource, type}) !=
+        saplingStatsMap_.end()) {
+      stats->increment(saplingStatsMap_[{fetchedSource, type}]);
+    }
     fetchedSource_ = fetchedSource;
   }
 
@@ -161,6 +172,32 @@ class ObjectFetchContext : public RefCounted {
   ObjectFetchContext& operator=(const ObjectFetchContext&) = delete;
 
   FetchedSource fetchedSource_{FetchedSource::Unknown};
+
+  std::unordered_map<
+      std::tuple<FetchedSource, ObjectType>,
+      StatsGroupBase::Counter SaplingBackingStoreStats::*>
+      saplingStatsMap_ = {
+          {{FetchedSource::Local, ObjectType::Tree},
+           &SaplingBackingStoreStats::fetchTreeLocal},
+          {{FetchedSource::Remote, ObjectType::Tree},
+           &SaplingBackingStoreStats::fetchTreeRemote},
+          {{FetchedSource::Local, ObjectType::RootTree},
+           &SaplingBackingStoreStats::getRootTreeLocal},
+          {{FetchedSource::Remote, ObjectType::RootTree},
+           &SaplingBackingStoreStats::getRootTreeRemote},
+          {{FetchedSource::Local, ObjectType::ManifestForRoot},
+           &SaplingBackingStoreStats::importManifestForRootLocal},
+          {{FetchedSource::Remote, ObjectType::ManifestForRoot},
+           &SaplingBackingStoreStats::importManifestForRootRemote},
+          {{FetchedSource::Local, ObjectType::Blob},
+           &SaplingBackingStoreStats::fetchBlobLocal},
+          {{FetchedSource::Remote, ObjectType::Blob},
+           &SaplingBackingStoreStats::fetchBlobRemote},
+          {{FetchedSource::Local, ObjectType::BlobMetadata},
+           &SaplingBackingStoreStats::fetchBlobMetadataLocal},
+          {{FetchedSource::Remote, ObjectType::BlobMetadata},
+           &SaplingBackingStoreStats::fetchBlobMetadataRemote},
+      };
 };
 
 // For fbcode/eden/scm/lib/backingstore/src/ffi.rs

eden/fs/store/TARGETS

@@ -111,6 +111,7 @@ cpp_library(
         "fbsource//third-party/fmt:fmt",
         "//eden/common/os:os",
         "//eden/common/utils:ref_ptr",
+        "//eden/fs/telemetry:stats",
     ],
 )