feat: new links to diff metric topics

Follow-up work from #1152

Plus some minor language fixes

Author: MattDodsonEnglish

src/data/markdown/docs/02 javascript api/10 k6-metrics.md

@@ -3,13 +3,14 @@ title: 'k6/metrics'
 excerpt: 'k6 Custom Metrics API'
 ---
 
-The metrics module provides functionality to create [custom metrics](/using-k6/metrics) of various types. All metrics (both the [built-in metrics](/using-k6/metrics#built-in-metrics) and the custom ones) have a type.
+The metrics module provides functionality to [create custom metrics](/using-k6/metrics/create-custom-metrics) of various types.
+All metrics (both the [built-in metrics](/using-k6/metrics/reference) and the custom ones) have a type.
 
-All values added to a custom metric can optionally be [tagged](/using-k6/tags-and-groups) which can be useful when analysing the test results.
+You can optionally [tag](/using-k6/tags-and-groups) all values added to a custom metric, which can be useful when analysing the test results.
 
 | Metric type                                   | Description                                                                                              |
 | --------------------------------------------- | -------------------------------------------------------------------------------------------------------- |
 | [Counter](/javascript-api/k6-metrics/counter) | A metric that cumulatively sums added values.                                                            |
 | [Gauge](/javascript-api/k6-metrics/gauge)     | A metric that stores the min, max and last values added to it.                                           |
 | [Rate](/javascript-api/k6-metrics/rate)       | A metric that tracks the percentage of added values that are non-zero.                                   |
-| [Trend](/javascript-api/k6-metrics/trend)     | A metric that allows for calculating statistics on the added values (min, max, average and percentiles). |
+| [Trend](/javascript-api/k6-metrics/trend)     | A metric that calculates statistics on the added values (min, max, average, and percentiles). |

src/data/markdown/translated-guides/en/02 Using k6/04 Thresholds.md

@@ -13,7 +13,7 @@ For example, you can create thresholds for any combination of the following expe
 - 95% of requests have a response time below 200ms.
 - 99% of requests have a response time below 400ms.
 - A specific endpoint always responds within 300ms.
-- Any conditions for a [custom metric](/using-k6/metrics#custom-metrics).
+- Any conditions for a [custom metric](/using-k6/metrics/create-custom-metrics).
 
 Thresholds are also essential for [load-testing automation](/testing-guides/automated-performance-testing):
 
@@ -207,7 +207,7 @@ If you want to set multiple thresholds for a metric, specify them with an [array
 
 ## Threshold examples to copy and paste
 
-The quickest way to start with thresholds is to use the [standard, built-in k6 metrics](/using-k6/metrics#http-specific-built-in-metrics).
+The quickest way to start with thresholds is to use the [built-in metrics](/using-k6/metrics/reference).
 Here are a few copy-paste examples that you can start using right away.
 
 For more specific threshold examples, refer to the [Counter](/javascript-api/k6-metrics/counter#counter-usage-in-thresholds), [Gauge](/javascript-api/k6-metrics/gauge#gauge-usage-in-thresholds), [Trend](/javascript-api/k6-metrics/trend#trend-usage-in-thresholds) and [Rate](/javascript-api/k6-metrics/rate#rate-usage-in-thresholds) pages.
@@ -485,7 +485,7 @@ export default function () {
 
 </CodeGroup>
 
-In this example, the `threshold` is configured on the [checks metric](/using-k6/metrics#built-in-metrics), establishing that the rate of successful checks is higher than 90%.
+In this example, the `threshold` is configured on the [checks metric](/using-k6/metrics/reference), establishing that the rate of successful checks is higher than 90%.
 
 Additionally, you can use `tags` on checks if you want to define a threshold based on a particular check or group of checks. For example: