Add details on processing vs response and 90th percentile

Author: RebeccaTamachiro

src/content/docs/dns/dns-firewall/analytics.mdx

@@ -6,7 +6,7 @@ sidebar:
 
 ---
 
-import { Badge, FeatureTable } from "~/components";
+import { Badge, FeatureTable, Details } from "~/components";
 
 Consider the sections below to learn how to access analytics and logs for your DNS Firewall.
 
@@ -45,7 +45,11 @@ The filters and time frame that you specify at the top of the page apply to all
 
 - **Query summary**: the number of queries and their distribution over time. This information is segmented by each of the [available dimensions](#available-dimensions) and the graph displays the top five values. You can select the dimensions through the different tabs above the graph and quickly filter for or exclude a certain value from the results by hovering over it and selecting **Filter** or **Exclude**.
 
-- **Query statistics**: an overview of query metrics. Namely, **Total queries**, **Cached queries** (and processing time), **Uncached queries** (and response time), and **Stale cache queries**. The processing and response times are displayed in milliseconds.
+- **Query statistics**: an overview of query metrics. Namely, **Total queries**, **Cached queries**, **Uncached queries**, and **Stale cache queries**.
+
+    <Details header="Processing time and response time"> Processing time refers to the total time taken to handle a query within DNS Firewall, meaning cached queries served directly from Cloudflare's servers. For uncached queries, the metric used is response time, which considers the time to get the answers from your upstream nameservers. The processing and response times are displayed in milliseconds.</Details>
+
+		<Details header="90th percentile (p90)"> Aside from the average for both processing and response times, `p90` values show you the maximum time that 90% of queries took to resolve. For example, if the p90 is 1 millisecond, it means 90% of the queries were resolved in 1 millisecond or less.</Details>
 
 - **DNS queries by data center**: a map indicating which Cloudflare data centers have handled DNS queries to your account. You can also find a list of the ten top results and quickly filter for or exclude a certain data center from the results by hovering over it and selecting **Filter** or **Exclude**.
 
@@ -87,3 +91,6 @@ The following table provides a description for each of the values that might be
 | `chaos_success`           | Response for [Chaos class](https://en.wikipedia.org/wiki/Chaosnet) was successfully served.                                                                    |
 | `attack_mitigation_block` | Query was blocked as part of [random prefix attack mitigation](/dns/dns-firewall/random-prefix-attacks/).                                                      |
 | `unknown`                 | There was an unknown error.                                                                                                                                    |
+
+[^1]: the total time taken to handle a query within DNS Firewall.
+[^2]: the time it takes when an answer is not cache and Cloudflare has to get the answer from your upstream nameservers.