Add locality cache size to TransactionMetrics.

[yao-xiao-github]

Example
trace.127.0.0.1.4503.1633992341.5ZksM5.0.2.xml:<Event Severity="10" Time="1633993882.506102" DateTime="2021-10-11T23:11:22Z" Type="TransactionMetrics" ID="a111d7864c84926b" Elapsed="5.00001" Cluster="" Internal="1" ReadVersions="0.999997 5.32161e-11 1595" ReadVersionsThrottled="0 -1 0" ReadVersionsCompleted="0.999997 6.78055e-11 1544" ReadVersionBatches="0.999997 6.78055e-11 1593" BatchPriorityReadVersions="0 -1 0" DefaultPriorityReadVersions="0 -1 52" ImmediatePriorityReadVersions="0.999997 5.32161e-11 1543" BatchPriorityReadVersionsCompleted="0 -1 0" DefaultPriorityReadVersionsCompleted="0 -1 1" ImmediatePriorityReadVersionsCompleted="0.999997 6.78055e-11 1543" LogicalUncachedReads="2.99999 2 4679" PhysicalReadRequests="2.99999 2 4634" PhysicalReadRequestsCompleted="2.99999 2 4634" GetKeyRequests="0 -1 0" GetValueRequests="0 -1 4" GetRangeRequests="2.99999 2 4675" GetRangeStreamRequests="0 -1 0" WatchRequests="0 -1 11" GetAddressesForKeyRequests="0 -1 0" BytesRead="1823.99 1823 2809429" KeysRead="7.99998 7 12340" MetadataVersionReads="0 -1 0" CommittedMutations="0 -1 1" CommittedMutationBytes="0 -1 72" SetMutations="0 -1 1" ClearMutations="0 -1 0" AtomicMutations="0 -1 0" CommitStarted="0 -1 1" CommitCompleted="0 -1 1" KeyServerLocationRequests="0 -1 8" KeyServerLocationRequestsCompleted="0 -1 8" StatusRequests="0 -1 0" TooOld="0 -1 0" FutureVersions="0 -1 0" NotCommitted="0 -1 0" MaybeCommitted="0 -1 0" ResourceConstrained="0 -1 0" ProcessBehind="0 -1 0" Throttled="0 -1 0" ExpensiveClearCostEstCount="0 -1 0" NumGrvFullBatches="0 -1 0" NumGrvTimedOutBatches="0.999997 6.78055e-11 1593" LocationCacheEntryCount="1" MeanLatency="0" MedianLatency="0" Latency90="0" Latency98="0" MaxLatency="0" MeanRowReadLatency="0" MedianRowReadLatency="0" MaxRowReadLatency="0" MeanGRVLatency="2.00748e-05" MedianGRVLatency="1.93119e-05" MaxGRVLatency="2.43187e-05" MeanCommitLatency="0" MedianCommitLatency="0" MaxCommitLatency="0" MeanMutationsPerCommit="0" MedianMutationsPerCommit="0" MaxMutationsPerCommit="0" MeanBytesPerCommit="0" MedianBytesPerCommit="0" MaxBytesPerCommit="0" NumLocalityCacheEntries="1" ThreadID="17469908612552362851" Machine="127.0.0.1:4503" LogGroup="default" Roles="CC,CP,DD,GP,MS,RK,RV,SS,TL" />

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Please check each of the following things and check all boxes before accepting a PR.

• The PR has a description, explaining both the problem and the solution.
• The description mentions which forms of testing were done and the testing seems reasonable.
• Every function/class/actor that was touched is reasonably well documented.

For Release-Branches

If this PR is made against a release-branch, please also check the following:

• This change/bugfix is a cherry-pick from the next younger branch (younger release-branch or master if this is the youngest branch)
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[foundationdb-ci]

AWS CodeBuild CI Report for macOS Catalina 10.15

• CodeBuild project: foundationdb-pull-request-build-macos
• Commit ID: 90ee93a
• Result: FAILED
• Error: Unexpected EC2 error: RequestLimitExceeded
• Build Logs (available for 30 days)

[foundationdb-ci]

AWS CodeBuild CI Report for Linux CentOS 7

• CodeBuild project: foundationdb-pull-request-build
• Commit ID: 90ee93a
• Result: FAILED
• Error: Unexpected EC2 error: RequestLimitExceeded
• Build Logs (available for 30 days)

[foundationdb-ci]

AWS CodeBuild CI Report for Linux CentOS 7

• CodeBuild project: foundationdb-pull-request-build
• Commit ID: 90ee93a
• Result: SUCCEEDED
• Error: N/A
• Build Logs (available for 30 days)