Add platform-agnostic sample rate page

docs/concepts/key-terms/sample-rates.mdx

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+---
+title: Sample Rates
+sidebar_order: 11
+description: "Adding Sentry to your app gives you a great deal of very valuable information about errors and performance you wouldn't otherwise get. And lots of information is good -- as long as it's the right information, at a reasonable volume."
+---
+
+<Note>
+Some of the options below are not available in every SDK; check out platform-specific docs for more info.
+</Note>
+
+
+
+- **tracesSampleRate** - A number between 0 and 1, controlling the percentage chance a given transaction will be sent to Sentry. (0 represents 0% while 1 represents 100%.) Applies equally to all transactions created in the app. Either this or `tracesSampler` must be defined to enable tracing.
+
+- **tracesSampler** - A function responsible for determining the percentage chance a given transaction will be sent to Sentry. It will automatically be passed information about the transaction and the context in which it's being created, and must return a number between 0 (0% chance of being sent) and 1 (100% chance of being sent). Can also be used for filtering transactions, by returning 0 for those that are unwanted. Either this or `tracesSampleRate` must be defined to enable tracing.
+
+- **replaysSessionSampleRate** - The sample rate for replays that begin recording immediately and last the entirety of the user's session. 1.0 collects all replays, and 0 collects none.
+
+- **replaysOnErrorSampleRate** - The sample rate for replays that are recorded when an error happens. This type of replay will record up to a minute of events prior to the error and continue recording until the session ends. 1.0 captures all sessions with an error, and 0 captures none.
+
+- **SampleRate** - Configures the sample rate for error events, in the range of 0.0 to 1.0. The default is 1.0, which means that 100% of error events will be sent. If set to 0.1, only 10% of error events will be sent. Events are picked randomly.