table cache: include tableCacheNode, tableCacheValue in size metric

We currently only count the size of the `sstable.Reader()` in the
table cache size metric. This commit adds the sizes of the
`tableCacheNode` and `tableCacheValue` as well.

table_cache.go

@@ -202,7 +202,7 @@ func (c *tableCacheContainer) metrics() (CacheMetrics, FilterMetrics) {
 		m.Hits += s.hits.Load()
 		m.Misses += s.misses.Load()
 	}
-	m.Size = m.Count * int64(unsafe.Sizeof(sstable.Reader{}))
+	m.Size = m.Count * int64(unsafe.Sizeof(tableCacheNode{})+unsafe.Sizeof(tableCacheValue{})+unsafe.Sizeof(sstable.Reader{}))
 	f := c.dbOpts.readerOpts.FilterMetricsTracker.Load()
 	return m, f
 }

testdata/copy_checkpoint_options

@@ -346,4 +346,4 @@ copy
   index_block_size=262144
   target_file_size=134217728
 ----
-----
+----

testdata/ingest

@@ -54,7 +54,7 @@ Virtual tables: 0 (0B)
 Local tables size: 569B
 Compression types: snappy: 1
 Block cache: 3 entries (1.1KB)  hit rate: 18.2%
-Table cache: 1 entries (760B)  hit rate: 50.0%
+Table cache: 1 entries (864B)  hit rate: 50.0%
 Secondary cache: 0 entries (0B)  hit rate: 0.0%
 Snapshots: 0  earliest seq num: 0
 Table iters: 0

testdata/metrics

@@ -76,7 +76,7 @@ Virtual tables: 0 (0B)
 Local tables size: 589B
 Compression types: snappy: 1
 Block cache: 2 entries (716B)  hit rate: 0.0%
-Table cache: 1 entries (760B)  hit rate: 0.0%
+Table cache: 1 entries (864B)  hit rate: 0.0%
 Secondary cache: 0 entries (0B)  hit rate: 0.0%
 Snapshots: 0  earliest seq num: 0
 Table iters: 1
@@ -136,7 +136,7 @@ Virtual tables: 0 (0B)
 Local tables size: 595B
 Compression types: snappy: 1
 Block cache: 2 entries (716B)  hit rate: 33.3%
-Table cache: 2 entries (1.5KB)  hit rate: 66.7%
+Table cache: 2 entries (1.7KB)  hit rate: 66.7%
 Secondary cache: 0 entries (0B)  hit rate: 0.0%
 Snapshots: 0  earliest seq num: 0
 Table iters: 2
@@ -183,7 +183,7 @@ Virtual tables: 0 (0B)
 Local tables size: 595B
 Compression types: snappy: 1
 Block cache: 2 entries (716B)  hit rate: 33.3%
-Table cache: 2 entries (1.5KB)  hit rate: 66.7%
+Table cache: 2 entries (1.7KB)  hit rate: 66.7%
 Secondary cache: 0 entries (0B)  hit rate: 0.0%
 Snapshots: 0  earliest seq num: 0
 Table iters: 2
@@ -227,7 +227,7 @@ Virtual tables: 0 (0B)
 Local tables size: 595B
 Compression types: snappy: 1
 Block cache: 2 entries (716B)  hit rate: 33.3%
-Table cache: 1 entries (760B)  hit rate: 66.7%
+Table cache: 1 entries (864B)  hit rate: 66.7%
 Secondary cache: 0 entries (0B)  hit rate: 0.0%
 Snapshots: 0  earliest seq num: 0
 Table iters: 1
@@ -510,7 +510,7 @@ Virtual tables: 0 (0B)
 Local tables size: 4.3KB
 Compression types: snappy: 7
 Block cache: 8 entries (2.8KB)  hit rate: 9.1%
-Table cache: 1 entries (760B)  hit rate: 53.8%
+Table cache: 1 entries (864B)  hit rate: 53.8%
 Secondary cache: 0 entries (0B)  hit rate: 0.0%
 Snapshots: 0  earliest seq num: 0
 Table iters: 0
@@ -575,7 +575,7 @@ Virtual tables: 0 (0B)
 Local tables size: 6.1KB
 Compression types: snappy: 10
 Block cache: 8 entries (2.8KB)  hit rate: 9.1%
-Table cache: 1 entries (760B)  hit rate: 53.8%
+Table cache: 1 entries (864B)  hit rate: 53.8%
 Secondary cache: 0 entries (0B)  hit rate: 0.0%
 Snapshots: 0  earliest seq num: 0
 Table iters: 0
@@ -853,7 +853,7 @@ Virtual tables: 0 (0B)
 Local tables size: 0B
 Compression types: snappy: 1
 Block cache: 0 entries (0B)  hit rate: 0.0%
-Table cache: 1 entries (760B)  hit rate: 0.0%
+Table cache: 1 entries (864B)  hit rate: 0.0%
 Secondary cache: 0 entries (0B)  hit rate: 0.0%
 Snapshots: 0  earliest seq num: 0
 Table iters: 0
@@ -901,7 +901,7 @@ Virtual tables: 0 (0B)
 Local tables size: 0B
 Compression types: snappy: 2
 Block cache: 4 entries (1.4KB)  hit rate: 0.0%
-Table cache: 1 entries (760B)  hit rate: 50.0%
+Table cache: 1 entries (864B)  hit rate: 50.0%
 Secondary cache: 0 entries (0B)  hit rate: 0.0%
 Snapshots: 0  earliest seq num: 0
 Table iters: 0
@@ -950,7 +950,7 @@ Virtual tables: 0 (0B)
 Local tables size: 589B
 Compression types: snappy: 3
 Block cache: 4 entries (1.4KB)  hit rate: 0.0%
-Table cache: 1 entries (760B)  hit rate: 50.0%
+Table cache: 1 entries (864B)  hit rate: 50.0%
 Secondary cache: 0 entries (0B)  hit rate: 0.0%
 Snapshots: 0  earliest seq num: 0
 Table iters: 0