Docs: add indexes for monitoring and performance monitoring

6 files changed, 96 insertions, 82 deletions

diff --git a/doc/administration/index.md b/doc/administration/index.md
index 58922b71ae7..0b199eecefd 100644
--- a/doc/administration/index.md
+++ b/doc/administration/index.md
@@ -106,20 +106,22 @@ server with IMAP authentication on Ubuntu, to be used with Reply by email.
 
 ## Monitoring GitLab
 
-- [Monitoring uptime](../user/admin_area/monitoring/health_check.md): Check the server status using the health check endpoint.
-  - [IP whitelist](monitoring/ip_whitelist.md): Monitor endpoints that provide health check information when probed.
-- [Monitoring GitHub imports](monitoring/github_imports.md): GitLab's GitHub Importer displays Prometheus metrics to monitor the health and progress of the importer.
+- [Monitoring GitLab](monitoring/index.md):
+  - [Monitoring uptime](../user/admin_area/monitoring/health_check.md): Check the server status using the health check endpoint.
+    - [IP whitelist](monitoring/ip_whitelist.md): Monitor endpoints that provide health check information when probed.
+    - [Monitoring GitHub imports](monitoring/github_imports.md): GitLab's GitHub Importer displays Prometheus metrics to monitor the health and progress of the importer.
 - [Conversational Development (ConvDev) Index](../user/admin_area/monitoring/convdev.md): Provides an overview of your entire instance's feature usage.
 
 ### Performance Monitoring
 
-- [GitLab Performance Monitoring](monitoring/performance/gitlab_configuration.md): Enable GitLab Performance Monitoring.
-- [GitLab performance monitoring with InfluxDB](monitoring/performance/introduction.md): Configure GitLab and InfluxDB for measuring performance metrics.
-  - [InfluxDB Schema](monitoring/performance/influxdb_schema.md): Measurements stored in InfluxDB.
-- [GitLab performance monitoring with Prometheus](monitoring/prometheus/index.md): Configure GitLab and Prometheus for measuring performance metrics.
-- [GitLab performance monitoring with Grafana](monitoring/prometheus/index.md): Configure GitLab to visualize time series metrics through graphs and dashboards.
-- [Request Profiling](monitoring/performance/request_profiling.md): Get a detailed profile on slow requests.
-- [Performance Bar](monitoring/performance/performance_bar.md): Get performance information for the current page.
+- [GitLab Performance Monitoring](monitoring/performance/index.md):
+  - [Enable Performance Monitoring](monitoring/performance/gitlab_configuration.md): Enable GitLab Performance Monitoring.
+  - [GitLab performance monitoring with InfluxDB](monitoring/performance/influxdb_configuration.md): Configure GitLab and InfluxDB for measuring performance metrics.
+    - [InfluxDB Schema](monitoring/performance/influxdb_schema.md): Measurements stored in InfluxDB.
+  - [GitLab performance monitoring with Prometheus](monitoring/prometheus/index.md): Configure GitLab and Prometheus for measuring performance metrics.
+  - [GitLab performance monitoring with Grafana](monitoring/performance/grafana_configuration.md): Configure GitLab to visualize time series metrics through graphs and dashboards.
+  - [Request Profiling](monitoring/performance/request_profiling.md): Get a detailed profile on slow requests.
+  - [Performance Bar](monitoring/performance/performance_bar.md): Get performance information for the current page.
 
 ## Troubleshooting
 
diff --git a/doc/administration/monitoring/index.md b/doc/administration/monitoring/index.md
new file mode 100644
index 00000000000..d6333ee62b4
--- /dev/null
+++ b/doc/administration/monitoring/index.md
@@ -0,0 +1,9 @@
+# Monitoring GitLab
+
+Explore our features to monitor your GitLab instance:
+
+- [Performance monitoring](performance/index.md): GitLab Performance Monitoring makes it possible to measure a wide variety of statistics of your instance.
+- [Prometheus](prometheus/index.md): Prometheus is a powerful time-series monitoring service, providing a flexible platform for monitoring GitLab and other software products.
+- [GitHub imports](github_imports.md): Monitor the health and progress of GitLab's GitHub importer with various Prometheus metrics.
+- [Monitoring uptime](../user/admin_area/monitoring/health_check.md): Check the server status using the health check endpoint.
+  - [IP whitelists](ip_whitelist.md): Configure GitLab for monitoring endpoints that provide health check information when probed.
diff --git a/doc/administration/monitoring/performance/index.md b/doc/administration/monitoring/performance/index.md
new file mode 100644
index 00000000000..f5f0363ed38
--- /dev/null
+++ b/doc/administration/monitoring/performance/index.md
@@ -0,0 +1,72 @@
+# GitLab Performance Monitoring
+
+GitLab comes with its own application performance measuring system as of GitLab
+8.4, simply called "GitLab Performance Monitoring". GitLab Performance Monitoring is available in both the
+Community and Enterprise editions.
+
+Apart from this introduction, you are advised to read through the following
+documents in order to understand and properly configure GitLab Performance Monitoring:
+
+- [GitLab Configuration](gitlab_configuration.md)
+- [InfluxDB Install/Configuration](influxdb_configuration.md)
+- [InfluxDB Schema](influxdb_schema.md)
+- [Grafana Install/Configuration](grafana_configuration.md)
+- [Performance bar](performance_bar.md)
+- [Request profiling](request_profiling.md)
+
+>**Note:**
+Omnibus GitLab 8.16 includes Prometheus as an additional tool to collect
+metrics. It will eventually replace InfluxDB when their metrics collection is
+on par. Read more in the [Prometheus documentation](../prometheus/index.md).
+
+## Introduction to GitLab Performance Monitoring
+
+GitLab Performance Monitoring makes it possible to measure a wide variety of statistics
+including (but not limited to):
+
+- The time it took to complete a transaction (a web request or Sidekiq job).
+- The time spent in running SQL queries and rendering HAML views.
+- The time spent executing (instrumented) Ruby methods.
+- Ruby object allocations, and retained objects in particular.
+- System statistics such as the process' memory usage and open file descriptors.
+- Ruby garbage collection statistics.
+
+Metrics data is written to [InfluxDB][influxdb] over [UDP][influxdb-udp]. Stored
+data can be visualized using [Grafana][grafana] or any other application that
+supports reading data from InfluxDB. Alternatively data can be queried using the
+InfluxDB CLI.
+
+## Metric Types
+
+Two types of metrics are collected:
+
+1. Transaction specific metrics.
+1. Sampled metrics, collected at a certain interval in a separate thread.
+
+### Transaction Metrics
+
+Transaction metrics are metrics that can be associated with a single
+transaction. This includes statistics such as the transaction duration, timings
+of any executed SQL queries, time spent rendering HAML views, etc. These metrics
+are collected for every Rack request and Sidekiq job processed.
+
+### Sampled Metrics
+
+Sampled metrics are metrics that can't be associated with a single transaction.
+Examples include garbage collection statistics and retained Ruby objects. These
+metrics are collected at a regular interval. This interval is made up out of two
+parts:
+
+1. A user defined interval.
+1. A randomly generated offset added on top of the interval, the same offset
+   can't be used twice in a row.
+
+The actual interval can be anywhere between a half of the defined interval and a
+half above the interval. For example, for a user defined interval of 15 seconds
+the actual interval can be anywhere between 7.5 and 22.5. The interval is
+re-generated for every sampling run instead of being generated once and re-used
+for the duration of the process' lifetime.
+
+[influxdb]: https://influxdata.com/time-series-platform/influxdb/
+[influxdb-udp]: https://docs.influxdata.com/influxdb/v0.9/write_protocols/udp/
+[grafana]: http://grafana.org/
diff --git a/doc/administration/monitoring/performance/introduction.md b/doc/administration/monitoring/performance/introduction.md
index 17c2b4b70d3..37a5388d2fc 100644
--- a/doc/administration/monitoring/performance/introduction.md
+++ b/doc/administration/monitoring/performance/introduction.md
@@ -1,70 +1 @@
-# GitLab Performance Monitoring
-
-GitLab comes with its own application performance measuring system as of GitLab
-8.4, simply called "GitLab Performance Monitoring". GitLab Performance Monitoring is available in both the
-Community and Enterprise editions.
-
-Apart from this introduction, you are advised to read through the following
-documents in order to understand and properly configure GitLab Performance Monitoring:
-
-- [GitLab Configuration](gitlab_configuration.md)
-- [InfluxDB Install/Configuration](influxdb_configuration.md)
-- [InfluxDB Schema](influxdb_schema.md)
-- [Grafana Install/Configuration](grafana_configuration.md)
-
->**Note:**
-Omnibus GitLab 8.16 includes Prometheus as an additional tool to collect
-metrics. It will eventually replace InfluxDB when their metrics collection is
-on par. Read more in the [Prometheus documentation](../prometheus/index.md).
-
-## Introduction to GitLab Performance Monitoring
-
-GitLab Performance Monitoring makes it possible to measure a wide variety of statistics
-including (but not limited to):
-
-- The time it took to complete a transaction (a web request or Sidekiq job).
-- The time spent in running SQL queries and rendering HAML views.
-- The time spent executing (instrumented) Ruby methods.
-- Ruby object allocations, and retained objects in particular.
-- System statistics such as the process' memory usage and open file descriptors.
-- Ruby garbage collection statistics.
-
-Metrics data is written to [InfluxDB][influxdb] over [UDP][influxdb-udp]. Stored
-data can be visualized using [Grafana][grafana] or any other application that
-supports reading data from InfluxDB. Alternatively data can be queried using the
-InfluxDB CLI.
-
-## Metric Types
-
-Two types of metrics are collected:
-
-1. Transaction specific metrics.
-1. Sampled metrics, collected at a certain interval in a separate thread.
-
-### Transaction Metrics
-
-Transaction metrics are metrics that can be associated with a single
-transaction. This includes statistics such as the transaction duration, timings
-of any executed SQL queries, time spent rendering HAML views, etc. These metrics
-are collected for every Rack request and Sidekiq job processed.
-
-### Sampled Metrics
-
-Sampled metrics are metrics that can't be associated with a single transaction.
-Examples include garbage collection statistics and retained Ruby objects. These
-metrics are collected at a regular interval. This interval is made up out of two
-parts:
-
-1. A user defined interval.
-1. A randomly generated offset added on top of the interval, the same offset
-   can't be used twice in a row.
-
-The actual interval can be anywhere between a half of the defined interval and a
-half above the interval. For example, for a user defined interval of 15 seconds
-the actual interval can be anywhere between 7.5 and 22.5. The interval is
-re-generated for every sampling run instead of being generated once and re-used
-for the duration of the process' lifetime.
-
-[influxdb]: https://influxdata.com/time-series-platform/influxdb/
-[influxdb-udp]: https://docs.influxdata.com/influxdb/v0.9/write_protocols/udp/
-[grafana]: http://grafana.org/
+This document was moved to [another location](index.md).
diff --git a/doc/development/performance.md b/doc/development/performance.md
index 04419650b12..e7c5a6ca07a 100644
--- a/doc/development/performance.md
+++ b/doc/development/performance.md
@@ -37,7 +37,7 @@ graphs/dashboards.
 GitLab provides built-in tools to aid the process of improving performance:
 
 * [Sherlock](profiling.md#sherlock)
-* [GitLab Performance Monitoring](../administration/monitoring/performance/introduction.md)
+* [GitLab Performance Monitoring](../administration/monitoring/performance/index.md)
 * [Request Profiling](../administration/monitoring/performance/request_profiling.md)
 * [QueryRecoder](query_recorder.md) for preventing `N+1` regressions
 
diff --git a/doc/monitoring/performance/introduction.md b/doc/monitoring/performance/introduction.md
index ae88baa0c14..4d6f02b6547 100644
--- a/doc/monitoring/performance/introduction.md
+++ b/doc/monitoring/performance/introduction.md
@@ -1 +1 @@
-This document was moved to [administration/monitoring/performance/introduction](../../administration/monitoring/performance/introduction.md).
+This document was moved to [administration/monitoring/performance/introduction](../../administration/monitoring/performance/index.md).