[docs] Update APM, Synthetics, Uptime links (#2584)

Related to elastic/docs-content#1069

Updates links to APM, Synthetics, and Uptime pages in
elastic/docs-content.

Author: colleenmcginnis

docs/reference/config-core.md

@@ -112,7 +112,7 @@ This allows for the reported hostname to be manually specified. If this is not s
 
 The name of the environment that this service is deployed in, e.g. "production" or "staging".
 
-Environments allow you to easily filter data on a global level in the APM app. It’s important to be consistent when naming environments across agents. See [environment selector](docs-content://solutions/observability/apps/filter-application-data.md#apm-filter-your-data-service-environment-filter) in the Kibana UI for more information.
+Environments allow you to easily filter data on a global level in the APM app. It’s important to be consistent when naming environments across agents. See [environment selector](docs-content://solutions/observability/apm/filter-data.md#apm-filter-your-data-service-environment-filter) in the Kibana UI for more information.
 
 ::::{note}
 This feature is fully supported in the APM app in Kibana versions >= 7.2. You must use the query bar to filter for a specific environment in versions prior to 7.2.
@@ -179,7 +179,7 @@ This setting can be changed after agent starts.
 
 ## `CentralConfig` ([1.1]) [config-central-config]
 
-If set to `true`, the agent makes periodic requests to the APM Server to fetch the latest [APM Agent configuration](docs-content://solutions/observability/apps/apm-agent-central-configuration.md).
+If set to `true`, the agent makes periodic requests to the APM Server to fetch the latest [APM Agent configuration](docs-content://solutions/observability/apm/apm-agent-central-configuration.md).
 
 | Environment variable name | IConfiguration key |
 | --- | --- |

docs/reference/config-http.md

@@ -168,7 +168,7 @@ This option supports the wildcard `*`, which matches zero or more characters. Ex
 
 ## `UseElasticTraceparentHeader` ([1.3.0]) [config-use-elastic-apm-traceparent-header]
 
-To enable [distributed tracing](docs-content://solutions/observability/apps/traces.md), the agent adds trace context headers to outgoing HTTP requests made with the `HttpClient` type. These headers (`traceparent` and `tracestate`) are defined in the [W3C Trace Context](https://www.w3.org/TR/trace-context-1/) specification.
+To enable [distributed tracing](docs-content://solutions/observability/apm/traces.md), the agent adds trace context headers to outgoing HTTP requests made with the `HttpClient` type. These headers (`traceparent` and `tracestate`) are defined in the [W3C Trace Context](https://www.w3.org/TR/trace-context-1/) specification.
 
 When this setting is `true`, the agent also adds the header `elasticapm-traceparent` for backwards compatibility with older versions of Elastic APM agents. Versions prior to `1.3.0` only read the `elasticapm-traceparent` header.
 

docs/reference/config-reporter.md

@@ -46,7 +46,7 @@ The `SecretToken` is sent as plain-text in every request to the server, so you s
 
 ## `ApiKey` ([1.4]) [config-api-key]
 
-A base64-encoded string used to ensure that only your agents can send data to your APM server. You must have created the API key using the APM server’s [command line tool](docs-content://solutions/observability/apps/api-keys.md).
+A base64-encoded string used to ensure that only your agents can send data to your APM server. You must have created the API key using the APM server’s [command line tool](docs-content://solutions/observability/apm/api-keys.md).
 
 ::::{note}
 This feature is fully supported in the APM Server versions >= 7.6.

docs/reference/configuration.md

@@ -14,7 +14,7 @@ By default, the agent uses environment variables. Additionally, on ASP.NET Core,
 
 Configuration options that are marked with the ![dynamic config](/reference/images/dynamic-config.svg "") badge can be changed at runtime when set from a supported source.
 
-The .NET Agent supports [Central configuration](docs-content://solutions/observability/apps/apm-agent-central-configuration.md), which allows you to fine-tune certain configurations via the APM app. This feature is enabled in the Agent by default, with [`CentralConfig` ([1.1])](/reference/config-core.md#config-central-config).
+The .NET Agent supports [Central configuration](docs-content://solutions/observability/apm/apm-agent-central-configuration.md), which allows you to fine-tune certain configurations via the APM app. This feature is enabled in the Agent by default, with [`CentralConfig` ([1.1])](/reference/config-core.md#config-central-config).
 
 
 

docs/reference/index.md

@@ -19,4 +19,4 @@ The Agent automatically registers callback methods for built-in Diagnostic Sourc
 
 ## Additional Components [additional-components]
 
-APM Agents work in conjunction with the [APM Server](docs-content://solutions/observability/apps/application-performance-monitoring-apm.md), [Elasticsearch](docs-content://get-started/index.md), and [Kibana](docs-content://get-started/the-stack.md). The [APM Guide](docs-content://solutions/observability/apps/application-performance-monitoring-apm.md) provides details on how these components work together, and provides a matrix outlining [Agent and Server compatibility](docs-content://solutions/observability/apps/apm-agent-compatibility.md).
+APM Agents work in conjunction with the [APM Server](docs-content://solutions/observability/apm/index.md), [Elasticsearch](docs-content://get-started/index.md), and [Kibana](docs-content://get-started/the-stack.md). The [APM Guide](docs-content://solutions/observability/apm/index.md) provides details on how these components work together, and provides a matrix outlining [Agent and Server compatibility](docs-content://solutions/observability/apm/apm-agent-compatibility.md).

docs/reference/metrics.md

@@ -161,7 +161,7 @@ The approximate accumulated collection elapsed time in milliseconds.
 
 ## Built-in application metrics [metrics-application]
 
-To power the [Time spent by span type](docs-content://solutions/observability/apps/transactions-2.md) graph, the agent collects summarized metrics about the timings of spans and transactions, broken down by span type.
+To power the [Time spent by span type](docs-content://solutions/observability/apm/transactions-ui.md) graph, the agent collects summarized metrics about the timings of spans and transactions, broken down by span type.
 
 **`transaction.duration`**
 :   type: simple timer

docs/reference/public-api.md

@@ -274,7 +274,7 @@ Agent.Tracer.CaptureErrorLog(errorLog);
 
 ## Transaction API [api-transaction]
 
-A transaction describes an event captured by an Elastic APM agent monitoring a service. Transactions help combine multiple [Spans](#api-span) into logical groups, and they are the first [Span](#api-span) of a service. More information on Transactions and Spans is available in the [APM data model](docs-content://solutions/observability/apps/learn-about-application-data-types.md) documentation.
+A transaction describes an event captured by an Elastic APM agent monitoring a service. Transactions help combine multiple [Spans](#api-span) into logical groups, and they are the first [Span](#api-span) of a service. More information on Transactions and Spans is available in the [APM data model](docs-content://solutions/observability/apm/data-types.md) documentation.
 
 See [`ITransaction CurrentTransaction`](#api-current-transaction) on how to get a reference of the current transaction.
 
@@ -363,7 +363,7 @@ A flat mapping of user-defined labels with string values.
 If the key contains any special characters (`.`,`*`, `"`), they will be replaced with underscores. For example `a.b` will be stored as `a_b`.
 
 ::::{tip}
-Before using custom labels, ensure you understand the different types of [metadata](docs-content://solutions/observability/apps/metadata.md) that are available.
+Before using custom labels, ensure you understand the different types of [metadata](docs-content://solutions/observability/apm/metadata.md) that are available.
 ::::
 
 
@@ -659,7 +659,7 @@ Similar to [`Dictionary<string,string> Labels`](#api-transaction-tags) on the [T
 If the key contains any special characters (`.`,`*`, `"`), they will be replaced with underscores. For example `a.b` will be stored as `a_b`.
 
 ::::{tip}
-Before using custom labels, ensure you understand the different types of [metadata](docs-content://solutions/observability/apps/metadata.md) that are available.
+Before using custom labels, ensure you understand the different types of [metadata](docs-content://solutions/observability/apm/metadata.md) that are available.
 ::::
 
 

docs/reference/setup-auto-instrumentation.md

@@ -85,7 +85,7 @@ The general steps in configuring profiler auto instrumentation are as follows; S
 
     1. `<unzipped directory>` is the directory to which the zip file was unzipped in step 2.
     2. The URL of the APM server intake to which traces and metrics should be sent.
-    3. The [secret token](docs-content://solutions/observability/apps/secret-token.md) used by the APM Agent to authenticate with APM server.
+    3. The [secret token](docs-content://solutions/observability/apm/secret-token.md) used by the APM Agent to authenticate with APM server.
 
 
     ```sh
@@ -100,7 +100,7 @@ The general steps in configuring profiler auto instrumentation are as follows; S
 
     1. `<unzipped directory>` is the directory to which the zip file was unzipped in step 2.
     2. The URL of the APM server intake to which traces and metrics should be sent.
-    3. The [secret token](docs-content://solutions/observability/apps/secret-token.md) used by the APM Agent to authenticate with APM server.
+    3. The [secret token](docs-content://solutions/observability/apm/secret-token.md) used by the APM Agent to authenticate with APM server.
 
 
     ```sh
@@ -115,7 +115,7 @@ The general steps in configuring profiler auto instrumentation are as follows; S
 
     1. `<unzipped directory>` is the directory to which the zip file was unzipped in step 2.
     2. The URL of the APM server intake to which traces and metrics should be sent.
-    3. The [secret token](docs-content://solutions/observability/apps/secret-token.md) used by the APM Agent to authenticate with APM server.
+    3. The [secret token](docs-content://solutions/observability/apm/secret-token.md) used by the APM Agent to authenticate with APM server.
 
 
 Ensure you start your application in a context where the set environment variables are visible.
@@ -207,7 +207,7 @@ Set-ItemProperty HKLM:SYSTEM\CurrentControlSet\Services\<service-name> -Name Env
 
 1. `<unzipped directory>` is the directory to which the zip file was unzipped.
 2. The URL of the APM server intake to which traces and metrics should be sent.
-3. The [secret token](docs-content://solutions/observability/apps/secret-token.md) used by the APM Agent to authenticate with APM server.
+3. The [secret token](docs-content://solutions/observability/apm/secret-token.md) used by the APM Agent to authenticate with APM server.
 4. `<service-name>` is the name of the Windows service.
 
 
@@ -248,7 +248,7 @@ $environment.Keys | ForEach-Object {
 2. `<unzipped directory>` is the full path to the directory in which the zip file was unzipped
 3. Forces assemblies **not** to be loaded domain-neutral. There is currently a limitation where Profiler auto-instrumentation cannot instrument assemblies when they are loaded domain-neutral. This limitation is expected to be removed in future, but for now, can be worked around by setting this environment variable. See the [Microsoft documentation for further details](https://docs.microsoft.com/en-us/dotnet/framework/app-domains/application-domains#the-complus_loaderoptimization-environment-variable).
 4. The URL of the APM server intake to which traces and metrics should be sent.
-5. The [secret token](docs-content://solutions/observability/apps/secret-token.md) used by the APM Agent to authenticate with APM server.
+5. The [secret token](docs-content://solutions/observability/apm/secret-token.md) used by the APM Agent to authenticate with APM server.
 
 
 ```powershell
@@ -273,7 +273,7 @@ $environment.Keys | ForEach-Object {
 1. `<application-pool>` is the name of the Application Pool your application uses. For example, `IIS APPPOOL\DefaultAppPool`.
 2. `<unzipped directory>` is the full path to the directory in which the zip file was unzipped.
 3. The URL of the APM server intake to which traces and metrics should be sent.
-4. The [secret token](docs-content://solutions/observability/apps/secret-token.md) used by the APM Agent to authenticate with APM server.
+4. The [secret token](docs-content://solutions/observability/apm/secret-token.md) used by the APM Agent to authenticate with APM server.
 
 
 ::::{important}
@@ -306,7 +306,7 @@ ELASTIC_APM_SECRET_TOKEN=<secret token> <3>
 
 1. `<unzipped directory>` is the directory to which the zip file was unzipped.
 2. The URL of the APM server intake to which traces and metrics should be sent.
-3. The [secret token](docs-content://solutions/observability/apps/secret-token.md) used by the APM Agent to authenticate with APM server.
+3. The [secret token](docs-content://solutions/observability/apm/secret-token.md) used by the APM Agent to authenticate with APM server.
 
 
 Then adding an [`EnvironmentFile`](https://www.freedesktop.org/software/systemd/man/systemd.service.html#Command%20lines) entry to the service’s configuration file that references the path to the environment.env file

docs/reference/setup-azure-functions.md

@@ -10,7 +10,7 @@ The .NET APM Agent can trace HTTP triggered function invocations in an [Azure Fu
 
 ## Prerequisites [_prerequisites]
 
-You need an APM Server to send APM data to. Follow the [APM Quick start](docs-content://solutions/observability/apps/get-started-with-apm.md) if you have not set one up yet. You will need your **APM server URL** and an APM server **secret token** (or **API key**) for configuring the APM agent below.
+You need an APM Server to send APM data to. Follow the [APM Quick start](docs-content://solutions/observability/apm/get-started.md) if you have not set one up yet. You will need your **APM server URL** and an APM server **secret token** (or **API key**) for configuring the APM agent below.
 
 You will also need an Azure Function app to monitor. If you do not have an existing one, you can follow [this Azure guide](https://learn.microsoft.com/en-us/azure/azure-functions/create-first-function-cli-csharp) to create one.
 

docs/reference/upgrading.md

@@ -10,7 +10,7 @@ Upgrades between minor versions of the agent, like from 1.1 to 1.2 are always ba
 Before upgrading the agent, be sure to review the:
 
 * [Agent release notes](/release-notes/index.md)
-* [Agent and Server compatibility chart](docs-content://solutions/observability/apps/apm-agent-compatibility.md)
+* [Agent and Server compatibility chart](docs-content://solutions/observability/apm/apm-agent-compatibility.md)
 
 
 ## End of life dates [end-of-life-dates]