add histograms (#122)

librocksdb_sys/src/lib.rs

@@ -193,7 +193,35 @@ pub enum DBStatisticsTickerType {
 pub enum DBStatisticsHistogramType {
     GetMicros = 0,
     WriteMicros = 1,
+    CompactionTime = 2,
+    SubcompactionSetupTime = 3,
+    TableSyncMicros = 4,
+    CompactionOutfileSyncMicros = 5,
+    WalFileSyncMicros = 6,
+    ManifestFileSyncMicros = 7,
+    TableOpenIOMicros = 8,
+    MultiGetMicros = 9,
+    ReadBlockCompactionMicros = 10,
+    ReadBlockGetMicros = 11,
+    WriteRawBlockMicros = 12,
+    StallL0SlowdownCount = 13,
+    StallMemtableCompactionCount = 14,
+    StallL0NumFilesCount = 15,
+    HardRateLimitDelayCount = 16,
+    SoftRateLimitDelayCount = 17,
+    NumFilesInSingleCompaction = 18,
     SeekMicros = 19,
+    WriteStall = 20,
+    SSTReadMicros = 21,
+    NumSubcompactionsScheduled = 22,
+    BytesPerRead = 23,
+    BytesPerWrite = 24,
+    BytesPerMultiget = 25,
+    BytesCompressed = 26,
+    BytesDecompressed = 27,
+    CompressionTimesNanos = 28,
+    DecompressionTimesNanos = 29,
+    ReadNumMergeOperands = 30,
 }
 
 #[derive(Copy, Clone)]