Use math notation

Signed-off-by: Magnus Jungsbluth <[email protected]>

docs/reference/filters.md

@@ -1804,7 +1804,11 @@ Requests can also be authorized based on the request body the same way that is s
 
 This filter has the same parameters that the `opaAuthorizeRequest` filter has.
 
-A request's body is parsed up to a maximum size with a default of 1MB that can be configured via the `-open-policy-agent-max-request-body-size` command line argument. To avoid OOM errors due to too many concurrent authorized body requests, another flag `-open-policy-agent-max-memory-body-parsing` controls how much memory can be used across all requests with a default of 100MB. If in-flight requests that use body authorization exceed that limit, incoming requests that use the body will be rejected with an internal server error. The number of concurrent requests is <max-memory-body-parsing> / min(avg(<request content-length>), <max-request-body-size>), so if requests on average have 100KB and the maximum memory is set to 100MB, on average 1024 authorized requests can be processed concurrently. 
+A request's body is parsed up to a maximum size with a default of 1MB that can be configured via the `-open-policy-agent-max-request-body-size` command line argument. To avoid OOM errors due to too many concurrent authorized body requests, another flag `-open-policy-agent-max-memory-body-parsing` controls how much memory can be used across all requests with a default of 100MB. If in-flight requests that use body authorization exceed that limit, incoming requests that use the body will be rejected with an internal server error. The number of concurrent requests is 
+
+$$ n_{max-memory-body-parsing} \over min(avg(n_{request-content-length}), n_{max-request-body-size}) $$
+
+so if requests on average have 100KB and the maximum memory is set to 100MB, on average 1024 authorized requests can be processed concurrently. 
 
 The filter also honors the `skip-request-body-parse` of the corresponding [configuration](https://www.openpolicyagent.org/docs/latest/envoy-introduction/#configuration) that the OPA plugin uses. 
 
@@ -1857,7 +1861,11 @@ If you want to serve requests directly from an Open Policy Agent policy that use
 
 This filter has the same parameters that the `opaServeResponse` filter has.
 
-A request's body is parsed up to a maximum size with a default of 1MB that can be configured via the `-open-policy-agent-max-request-body-size` command line argument. To avoid OOM errors due to too many concurrent authorized body requests, another flag `-open-policy-agent-max-memory-body-parsing` controls how much memory can be used across all requests with a default of 100MB. If  in-flight requests that use body authorization exceed that limit, incoming requests that use the body will be rejected with an internal server error. The number of concurrent requests is <max-memory-body-parsing> / min(avg(<request content-length>), <max-request-body-size>), so if requests on average have 100KB and the maximum memory is set to 100MB, on average 1024 authorized requests can be processed concurrently.
+A request's body is parsed up to a maximum size with a default of 1MB that can be configured via the `-open-policy-agent-max-request-body-size` command line argument. To avoid OOM errors due to too many concurrent authorized body requests, another flag `-open-policy-agent-max-memory-body-parsing` controls how much memory can be used across all requests with a default of 100MB. If  in-flight requests that use body authorization exceed that limit, incoming requests that use the body will be rejected with an internal server error. The number of concurrent requests is 
+
+$$ n_{max-memory-body-parsing} \over min(avg(n_{request-content-length}), n_{max-request-body-size}) $$
+
+so if requests on average have 100KB and the maximum memory is set to 100MB, on average 1024 authorized requests can be processed concurrently.
 
 The filter also honors the `skip-request-body-parse` of the corresponding [configuration](https://www.openpolicyagent.org/docs/latest/envoy-introduction/#configuration) that the OPA plugin uses.