concepts: data-pipeline: buffer: Add Mermaid chart

Signed-off-by: Alexa Kreizinger <alexakreizinger@gmail.com>

Author: alexakreizinger

concepts/data-pipeline/buffer.md

@@ -8,7 +8,19 @@ Previously defined in the [Buffering](../buffering.md) concept section, the `buf
 
 The `buffer` phase already contains the data in an immutable state, meaning, no other filter can be applied.
 
-![](<../../.gitbook/assets/logging\_pipeline\_buffer (1) (1) (2) (2) (2) (2) (2) (2) (2) (1).png>)
+```mermaid
+graph LR
+    accTitle: Fluent Bit data pipeline
+    accDescr: The Fluent Bit data pipeline includes input, a parser, a filter, a buffer, routing, and various outputs.
+    A[Input] --> B[Parser]
+    B --> C[Filter]
+    C --> D[Buffer]
+    D --> E((Routing))
+    E --> F[Output 1]
+    E --> G[Output 2]
+    E --> H[Output 3]
+    style D stroke:darkred,stroke-width:2px;
+```
 
 {% hint style="info" %}
 Note that buffered data is not raw text, it's in Fluent Bit's internal binary representation.