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Add ccs_telemetry documentation
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‎docs/reference/cluster/stats.asciidoc‎

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@@ -1307,6 +1307,142 @@ Each repository type may also include other statistics about the repositories of
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====
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`ccs`::
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(object) Contains information relating to <<modules-cross-cluster-search, cross-cluster search>> settings and activity in the cluster.
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+
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.Properties of `ccs`
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[%collapsible%open]
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=====
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`_search`:::
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(object) Contains telemetry information about the <<modules-cross-cluster-search, cross-cluster searches>> in the cluster.
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+
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.Properties of `_search`
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[%collapsible%open]
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======
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`total`:::
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(integer) The total number of cross-cluster search requests that have been executed by the cluster.
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`success`:::
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(integer) The total number of cross-cluster search requests that have been successfully executed by the cluster.
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`skipped`:::
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(integer) The total number of cross-cluster search requests that had at least one remote cluster skipped.
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`took`:::
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(object) Contains statistics about the time taken to execute cross-cluster search requests.
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+
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.Properties of `took`
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[%collapsible%open]
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=======
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`max`:::
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(integer) The maximum time taken to execute a cross-cluster search request, in milliseconds.
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`avg`:::
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(integer) The median time taken to execute a cross-cluster search request, in milliseconds.
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`p90`:::
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(integer) The 90th percentile of the time taken to execute cross-cluster search requests, in milliseconds.
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=======
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`took_mrt_true`::
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(object) Contains statistics about the time taken to execute cross-cluster search requests for which the
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<<ccs-minimize-roundtrips,`ccs_minimize_roundtrips`>> setting was set to `true`.
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+
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.Properties of `took_mrt_true`
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[%collapsible%open]
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=======
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`max`:::
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(integer) The maximum time taken to execute a cross-cluster search request, in milliseconds.
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`avg`:::
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(integer) The median time taken to execute a cross-cluster search request, in milliseconds.
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`p90`:::
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(integer) The 90th percentile of the time taken to execute cross-cluster search requests, in milliseconds.
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=======
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`took_mrt_false`::
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(object) Contains statistics about the time taken to execute cross-cluster search requests for which the
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<<ccs-minimize-roundtrips,`ccs_minimize_roundtrips`>> setting was set to `false`.
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+
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.Properties of `took_mrt_false`
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[%collapsible%open]
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=======
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`max`:::
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(integer) The maximum time taken to execute a cross-cluster search request, in milliseconds.
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`avg`:::
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(integer) The median time taken to execute a cross-cluster search request, in milliseconds.
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`p90`:::
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(integer) The 90th percentile of the time taken to execute cross-cluster search requests, in milliseconds.
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=======
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`remotes_per_search_max`::
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(integer) The maximum number of remote clusters that were queried in a single cross-cluster search request.
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`remotes_per_search_avg`::
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(integer) The average number of remote clusters that were queried in a single cross-cluster search request.
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`failure_reasons`::
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(object) Contains statistics about the reasons for cross-cluster search request failures.
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The keys are the failure reasons names and the values are the number of requests that failed for that reason.
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`features`::
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(object) Contains statistics about the features used in cross-cluster search requests. The keys are the names of the search feature,
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and the values are the number of requests that used that feature. Single request can use more than one feature
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(e.g. both `async` and `wildcard`). Known features are:
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* `async` - <<async-search, Async search>>
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* `mrt` - <<ccs-minimize-roundtrips,`ccs_minimize_roundtrips`>> setting was set to `true`.
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* `wildcard` - <<api-multi-index,Multi-target syntax>> for indices with wildcards was used in the search request.
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`clients`::
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(object) Contains statistics about the clients that executed cross-cluster search requests.
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The keys are the names of the clients, and the values are the number of requests that were executed by that client.
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Only known clients (such as `kibana` or `elasticsearch`) are counted.
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`clusters`::
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(object) Contains statistics about the clusters that were queried in cross-cluster search requests.
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The keys are cluster names, and the values are per-cluster telemetry data.
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This also includes the local cluster itself, which uses the name `(local)`.
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+
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.Properties of per-cluster data:
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[%collapsible%open]
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=======
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`total`:::
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(integer) The total number of successful (not skipped) cross-cluster search requests that were executed against this cluster.
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This may include requests where partial results were returned, but not requests in which the cluster has been skipped entirely.
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`skipped`:::
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(integer) The total number of cross-cluster search requests for which this cluster was skipped.
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`took`:::
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(object) Contains statistics about the time taken to execute requests against this cluster.
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+
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.Properties of `took`
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[%collapsible%open]
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========
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`max`:::
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(integer) The maximum time taken to execute a cross-cluster search request, in milliseconds.
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`avg`:::
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(integer) The median time taken to execute a cross-cluster search request, in milliseconds.
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`p90`:::
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(integer) The 90th percentile of the time taken to execute cross-cluster search requests, in milliseconds.
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========
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=======
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======
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=====
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[[cluster-stats-api-example]]
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==== {api-examples-title}
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@@ -1607,7 +1743,35 @@ The API returns the following response:
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},
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"repositories": {
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...
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}
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},
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"ccs": {
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"_search": {
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"total": 7,
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"success": 7,
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"skipped": 0,
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"took": {
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"max": 36,
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"avg": 20,
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"p90": 33
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},
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"took_mrt_true": {
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"max": 33,
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"avg": 15,
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"p90": 33
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},
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"took_mrt_false": {
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"max": 36,
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"avg": 26,
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"p90": 36
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},
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"remotes_per_search_max": 3,
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"remotes_per_search_avg": 2.0,
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"failure_reasons": { ... },
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"features": { ... },
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"clients": { ... },
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"clusters": { ... }
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}
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}
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}
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--------------------------------------------------
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// TESTRESPONSE[s/"plugins": \[[^\]]*\]/"plugins": $body.$_path/]
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// TESTRESPONSE[s/"packaging_types": \[[^\]]*\]/"packaging_types": $body.$_path/]
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// TESTRESPONSE[s/"snapshots": \{[^\}]*\}/"snapshots": $body.$_path/]
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// TESTRESPONSE[s/"repositories": \{[^\}]*\}/"repositories": $body.$_path/]
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// TESTRESPONSE[s/"clusters": \{[^\}]*\}/"clusters": $body.$_path/]
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// TESTRESPONSE[s/"features": \{[^\}]*\}/"features": $body.$_path/]
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// TESTRESPONSE[s/"clients": \{[^\}]*\}/"clients": $body.$_path/]
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// TESTRESPONSE[s/"failure_reasons": \{[^\}]*\}/"failure_reasons": $body.$_path/]
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// TESTRESPONSE[s/"field_types": \[[^\]]*\]/"field_types": $body.$_path/]
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// TESTRESPONSE[s/"runtime_field_types": \[[^\]]*\]/"runtime_field_types": $body.$_path/]
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// TESTRESPONSE[s/"search": \{[^\}]*\}/"search": $body.$_path/]
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// TESTRESPONSE[s/: true|false/: $body.$_path/]
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// TESTRESPONSE[s/"remotes_per_search_avg": [.0-9]+/"remotes_per_search_avg": $body.$_path/]
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// TESTRESPONSE[s/: (true|false)/: $body.$_path/]
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// TESTRESPONSE[s/: (\-)?[0-9]+/: $body.$_path/]
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// TESTRESPONSE[s/: "[^"]*"/: $body.$_path/]
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// These replacements do a few things:

‎server/src/main/java/org/elasticsearch/TransportVersions.java‎

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@@ -207,7 +207,6 @@ static TransportVersion def(int id) {
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public static final TransportVersion UNASSIGNED_PRIMARY_COUNT_ON_CLUSTER_HEALTH = def(8_737_00_0);
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public static final TransportVersion ESQL_AGGREGATE_EXEC_TRACKS_INTERMEDIATE_ATTRS = def(8_738_00_0);
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public static final TransportVersion CCS_TELEMETRY_STATS = def(8_733_00_0);
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/*
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* STOP! READ THIS FIRST! No, really,

‎server/src/main/java/org/elasticsearch/action/admin/cluster/stats/CCSUsageTelemetry.java‎

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@@ -175,7 +175,7 @@ public static class PerClusterCCSTelemetry {
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// The number of successful (not skipped) requests to this cluster.
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private final LongAdder count;
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private final LongAdder skippedCount;
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// This is only over the successful requetss, skipped ones do not count here.
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// This is only over the successful requests, skipped ones do not count here.
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private final LongMetric took;
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PerClusterCCSTelemetry(String clusterAlias) {

‎server/src/main/java/org/elasticsearch/action/admin/cluster/stats/ClusterStatsResponse.java‎

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@@ -136,7 +136,9 @@ public XContentBuilder toXContent(XContentBuilder builder, Params params) throws
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repositoryUsageStats.toXContent(builder, params);
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if (CCS_TELEMETRY_FEATURE_FLAG.isEnabled()) {
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builder.startObject("ccs");
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ccsMetrics.toXContent(builder, params);
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builder.endObject();
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}
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return builder;

‎x-pack/plugin/monitoring/src/test/java/org/elasticsearch/xpack/monitoring/collector/cluster/ClusterStatsMonitoringDocTests.java‎

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@@ -755,37 +755,37 @@ public void testToXContent() throws IOException {
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"repositories": {}
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},
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"repositories": {},
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"ccs_telemetry": {
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"total": 0,
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"success": 0,
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"skipped": 0,
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"took": {
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"max": 0,
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"avg": 0,
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"p90": 0
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},
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"took_mrt_true": {
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"max": 0,
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"avg": 0,
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"p90": 0
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},
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"took_mrt_false": {
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"max": 0,
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"avg": 0,
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"p90": 0
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},
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"remotes_per_search_max": 0,
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"remotes_per_search_avg": 0.0,
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"failure_reasons": {
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},
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"features": {
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},
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"clients": {
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},
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"clusters": {
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"count": 0
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"ccs": {
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"_search": {
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"total": 0,
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"success": 0,
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"skipped": 0,
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"took": {
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"max": 0,
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"avg": 0,
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"p90": 0
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},
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"took_mrt_true": {
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"max": 0,
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"avg": 0,
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"p90": 0
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},
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"took_mrt_false": {
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"max": 0,
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"avg": 0,
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"p90": 0
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},
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"remotes_per_search_max": 0,
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"remotes_per_search_avg": 0.0,
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"failure_reasons": {
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},
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"features": {
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},
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"clients": {
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},
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"clusters": {}
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}
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}
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}
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},
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"cluster_state": {
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"nodes_hash": 1314980060,

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