Add a short section to turn on LiveMetrics

Author: JackMeadDev

README.md

@@ -137,7 +137,7 @@ It's a good habit to specify a version when adding these: you can find the lates
 
 Next, we configure the logging in `app.py` by adapting this sample code: <https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/monitor/azure-monitor-opentelemetry/samples/tracing/http_flask.py>. This will log all requests to your Flask app (like every time you view the webpage) and the in-built exporter will send those logs to Application Insights.
 
-> The environment variable gets picked up automatically so your code doesn't need to pass anything into `configure_azure_monitor()` call. Just make sure the application setting in Azure is the whole connection string, including `InstrumentationKey=`!
+> The environment variable gets picked up automatically so your code doesn't need to pass it directly into the `configure_azure_monitor()` call. Just make sure the application setting in Azure is the whole connection string, including `InstrumentationKey=`!
 
 > Note that the auto-configuration relies on a strict ordering and flask needs to be _imported_ after we have run the configuration - so you may have code like:
 > ```python
@@ -190,6 +190,17 @@ Back in App Insights under Alerts you'll see an alert is raised.
 With the default settings this will take up to 5 minutes.
 If you set up emails above you'll start to receive these.
 
+## Add Live Metrics
+
+You may have noticed that even once the app is reporting logs to App Insights they lag the system slightly, e.g. searching your traces may not show logging statements from more than a minute ago. In many cases this is sufficient, but there may be times that we want lower latency on our stats - for example whilst monitoring a release.
+
+Azure offers ["Live Metrics"](https://learn.microsoft.com/en-us/azure/azure-monitor/app/live-stream?tabs=otel) to help with this. Try turning that on now by adjusting your setup command to:
+```python
+configure_azure_monitor(enable_live_metrics = True)
+```
+
+Once that's deployed, check out the "Live Metrics" tab (under the "Investigate" menu) in Application Insights. Again, it might take a few minutes to appear, but once it does you'll see that the traces on display are coming through within a second or two of being generated.
+
 ## Improve the queue
 
 You'll now receive an email every 5 minutes until Jan 1st 3000.