Fix tests on linux + types

docs/development/core/server/kibana-plugin-core-server.md

@@ -123,7 +123,7 @@ The plugin integrates with the core system via lifecycle events: `setup`<!-- -->
 |  [LoggerFactory](./kibana-plugin-core-server.loggerfactory.md) | The single purpose of <code>LoggerFactory</code> interface is to define a way to retrieve a context-based logger instance. |
 |  [LoggingServiceSetup](./kibana-plugin-core-server.loggingservicesetup.md) | Provides APIs to plugins for customizing the plugin's logger. |
 |  [LogMeta](./kibana-plugin-core-server.logmeta.md) | Contextual metadata |
-|  [MetricsServiceSetup](./kibana-plugin-core-server.metricsservicesetup.md) |  |
+|  [MetricsServiceSetup](./kibana-plugin-core-server.metricsservicesetup.md) | APIs to retrieves metrics gathered and exposed by the core platform. |
 |  [NodesVersionCompatibility](./kibana-plugin-core-server.nodesversioncompatibility.md) |  |
 |  [OnPostAuthToolkit](./kibana-plugin-core-server.onpostauthtoolkit.md) | A tool set defining an outcome of OnPostAuth interceptor for incoming request. |
 |  [OnPreAuthToolkit](./kibana-plugin-core-server.onpreauthtoolkit.md) | A tool set defining an outcome of OnPreAuth interceptor for incoming request. |

docs/development/core/server/kibana-plugin-core-server.metricsservicesetup.collectioninterval.md

@@ -0,0 +1,13 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-core-server](./kibana-plugin-core-server.md) &gt; [MetricsServiceSetup](./kibana-plugin-core-server.metricsservicesetup.md) &gt; [collectionInterval](./kibana-plugin-core-server.metricsservicesetup.collectioninterval.md)
+
+## MetricsServiceSetup.collectionInterval property
+
+Interval metrics are collected in milliseconds
+
+<b>Signature:</b>
+
+```typescript
+readonly collectionInterval: number;
+```

docs/development/core/server/kibana-plugin-core-server.metricsservicesetup.getopsmetrics_.md

@@ -0,0 +1,24 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-core-server](./kibana-plugin-core-server.md) &gt; [MetricsServiceSetup](./kibana-plugin-core-server.metricsservicesetup.md) &gt; [getOpsMetrics$](./kibana-plugin-core-server.metricsservicesetup.getopsmetrics_.md)
+
+## MetricsServiceSetup.getOpsMetrics$ property
+
+Retrieve an observable emitting the [OpsMetrics](./kibana-plugin-core-server.opsmetrics.md) gathered. The observable will emit an initial value during core's `start` phase, and a new value every fixed interval of time, based on the `opts.interval` configuration property.
+
+<b>Signature:</b>
+
+```typescript
+getOpsMetrics$: () => Observable<OpsMetrics>;
+```
+
+## Example
+
+
+```ts
+core.metrics.getOpsMetrics$().subscribe(metrics => {
+  // do something with the metrics
+})
+
+```
+

docs/development/core/server/kibana-plugin-core-server.metricsservicesetup.md

@@ -4,8 +4,18 @@
 
 ## MetricsServiceSetup interface
 
+APIs to retrieves metrics gathered and exposed by the core platform.
+
 <b>Signature:</b>
 
 ```typescript
 export interface MetricsServiceSetup 
 ```
+
+## Properties
+
+|  Property | Type | Description |
+|  --- | --- | --- |
+|  [collectionInterval](./kibana-plugin-core-server.metricsservicesetup.collectioninterval.md) | <code>number</code> | Interval metrics are collected in milliseconds |
+|  [getOpsMetrics$](./kibana-plugin-core-server.metricsservicesetup.getopsmetrics_.md) | <code>() =&gt; Observable&lt;OpsMetrics&gt;</code> | Retrieve an observable emitting the [OpsMetrics](./kibana-plugin-core-server.opsmetrics.md) gathered. The observable will emit an initial value during core's <code>start</code> phase, and a new value every fixed interval of time, based on the <code>opts.interval</code> configuration property. |
+

docs/development/core/server/kibana-plugin-core-server.opsmetrics.collected_at.md

@@ -0,0 +1,13 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-core-server](./kibana-plugin-core-server.md) &gt; [OpsMetrics](./kibana-plugin-core-server.opsmetrics.md) &gt; [collected\_at](./kibana-plugin-core-server.opsmetrics.collected_at.md)
+
+## OpsMetrics.collected\_at property
+
+Time metrics were recorded at.
+
+<b>Signature:</b>
+
+```typescript
+collected_at: Date;
+```

docs/development/core/server/kibana-plugin-core-server.opsmetrics.md

@@ -16,6 +16,7 @@ export interface OpsMetrics
 
 |  Property | Type | Description |
 |  --- | --- | --- |
+|  [collected\_at](./kibana-plugin-core-server.opsmetrics.collected_at.md) | <code>Date</code> | Time metrics were recorded at. |
 |  [concurrent\_connections](./kibana-plugin-core-server.opsmetrics.concurrent_connections.md) | <code>OpsServerMetrics['concurrent_connections']</code> | number of current concurrent connections to the server |
 |  [os](./kibana-plugin-core-server.opsmetrics.os.md) | <code>OpsOsMetrics</code> | OS related metrics |
 |  [process](./kibana-plugin-core-server.opsmetrics.process.md) | <code>OpsProcessMetrics</code> | Process related metrics |

docs/development/core/server/kibana-plugin-core-server.opsosmetrics.cpu.md

@@ -0,0 +1,22 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-core-server](./kibana-plugin-core-server.md) &gt; [OpsOsMetrics](./kibana-plugin-core-server.opsosmetrics.md) &gt; [cpu](./kibana-plugin-core-server.opsosmetrics.cpu.md)
+
+## OpsOsMetrics.cpu property
+
+cpu cgroup metrics, undefined when not running in a cgroup
+
+<b>Signature:</b>
+
+```typescript
+cpu?: {
+        control_group: string;
+        cfs_period_micros: number;
+        cfs_quota_micros: number;
+        stat: {
+            number_of_elapsed_periods: number;
+            number_of_times_throttled: number;
+            time_throttled_nanos: number;
+        };
+    };
+```

docs/development/core/server/kibana-plugin-core-server.opsosmetrics.cpuacct.md

@@ -0,0 +1,16 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [kibana-plugin-core-server](./kibana-plugin-core-server.md) &gt; [OpsOsMetrics](./kibana-plugin-core-server.opsosmetrics.md) &gt; [cpuacct](./kibana-plugin-core-server.opsosmetrics.cpuacct.md)
+
+## OpsOsMetrics.cpuacct property
+
+cpu accounting metrics, undefined when not running in a cgroup
+
+<b>Signature:</b>
+
+```typescript
+cpuacct?: {
+        control_group: string;
+        usage_nanos: number;
+    };
+```

docs/development/core/server/kibana-plugin-core-server.opsosmetrics.md

@@ -16,6 +16,8 @@ export interface OpsOsMetrics
 
 |  Property | Type | Description |
 |  --- | --- | --- |
+|  [cpu](./kibana-plugin-core-server.opsosmetrics.cpu.md) | <code>{</code><br/><code>        control_group: string;</code><br/><code>        cfs_period_micros: number;</code><br/><code>        cfs_quota_micros: number;</code><br/><code>        stat: {</code><br/><code>            number_of_elapsed_periods: number;</code><br/><code>            number_of_times_throttled: number;</code><br/><code>            time_throttled_nanos: number;</code><br/><code>        };</code><br/><code>    }</code> | cpu cgroup metrics, undefined when not running in a cgroup |
+|  [cpuacct](./kibana-plugin-core-server.opsosmetrics.cpuacct.md) | <code>{</code><br/><code>        control_group: string;</code><br/><code>        usage_nanos: number;</code><br/><code>    }</code> | cpu accounting metrics, undefined when not running in a cgroup |
 |  [distro](./kibana-plugin-core-server.opsosmetrics.distro.md) | <code>string</code> | The os distrib. Only present for linux platforms |
 |  [distroRelease](./kibana-plugin-core-server.opsosmetrics.distrorelease.md) | <code>string</code> | The os distrib release, prefixed by the os distrib. Only present for linux platforms |
 |  [load](./kibana-plugin-core-server.opsosmetrics.load.md) | <code>{</code><br/><code>        '1m': number;</code><br/><code>        '5m': number;</code><br/><code>        '15m': number;</code><br/><code>    }</code> | cpu load metrics |

src/core/server/legacy/legacy_service.ts

@@ -277,6 +277,7 @@ export class LegacyService implements CoreService {
         getTypeRegistry: startDeps.core.savedObjects.getTypeRegistry,
       },
       metrics: {
+        collectionInterval: startDeps.core.metrics.collectionInterval,
         getOpsMetrics$: startDeps.core.metrics.getOpsMetrics$,
       },
       uiSettings: { asScopedToClient: startDeps.core.uiSettings.asScopedToClient },

src/core/server/metrics/collectors/os.ts

@@ -33,7 +33,7 @@ export interface OpsMetricsCollectorOptions {
 export class OsMetricsCollector implements MetricsCollector<OpsOsMetrics> {
   private readonly cgroupCollector: OsCgroupMetricsCollector;
 
-  constructor(options: OpsMetricsCollectorOptions) {
+  constructor(options: OpsMetricsCollectorOptions = {}) {
     this.cgroupCollector = new OsCgroupMetricsCollector(options);
   }
 

src/core/server/plugins/plugin_context.ts

@@ -236,6 +236,7 @@ export function createPluginStartContext<TPlugin, TPluginDependencies>(
       getTypeRegistry: deps.savedObjects.getTypeRegistry,
     },
     metrics: {
+      collectionInterval: deps.metrics.collectionInterval,
       getOpsMetrics$: deps.metrics.getOpsMetrics$,
     },
     uiSettings: {

src/core/server/server.api.md

@@ -1581,10 +1581,10 @@ export interface LogRecord {
     timestamp: Date;
 }
 
-// Warning: (ae-missing-release-tag) "MetricsServiceSetup" is exported by the package, but it is missing a release tag (@alpha, @beta, @public, or @internal)
-//
-// @public (undocumented)
+// @public
 export interface MetricsServiceSetup {
+    readonly collectionInterval: number;
+    getOpsMetrics$: () => Observable<OpsMetrics>;
 }
 
 // @public @deprecated (undocumented)
@@ -1671,6 +1671,7 @@ export interface OnPreRoutingToolkit {
 
 // @public
 export interface OpsMetrics {
+    collected_at: Date;
     concurrent_connections: OpsServerMetrics['concurrent_connections'];
     os: OpsOsMetrics;
     process: OpsProcessMetrics;
@@ -1680,6 +1681,20 @@ export interface OpsMetrics {
 
 // @public
 export interface OpsOsMetrics {
+    cpu?: {
+        control_group: string;
+        cfs_period_micros: number;
+        cfs_quota_micros: number;
+        stat: {
+            number_of_elapsed_periods: number;
+            number_of_times_throttled: number;
+            time_throttled_nanos: number;
+        };
+    };
+    cpuacct?: {
+        control_group: string;
+        usage_nanos: number;
+    };
     distro?: string;
     distroRelease?: string;
     load: {