start docs, targets

books/architecture/src/SUMMARY.md

@@ -81,8 +81,7 @@
 ---
 
 - [🔴 Instrumentation](instrumentation/intro.md)
-    - [⚪️ Logging](instrumentation/logging.md)
-    - [⚪️ Data collection](instrumentation/data-collection.md)
+    - [⚪️ Targets](instrumentation/targets.md)
 
 ---
 

books/architecture/src/instrumentation/data-collection.md

@@ -1 +0,0 @@
-# ⚪️ Data collection

books/architecture/src/instrumentation/intro.md

@@ -1,2 +1,6 @@
 # Instrumentation
 Cuprate is built with [instrumentation](https://en.wikipedia.org/wiki/Instrumentation) in mind. 
+The [tracing](https://docs.rs/tracing/latest/tracing/) crate is used to provide "structured, event-based diagnostic information".
+
+As described in the tracing crate docs, there are 3 main concepts: spans, events and subscribers. Small explanations for
+each will be included in the following chapters, however you should probably read the tracing docs.

books/architecture/src/instrumentation/targets.md

@@ -0,0 +1,60 @@
+# Targets
+The target is described in the `tracing `docs as:
+
+> a string that categorizes part of the system where the span or event occurred.
+
+By default, the `tracing` crate will use the module path as the target, we override this to make it easier for users
+to filter logs.
+
+`tracing-subscriber` allows filtering logs based on target prefixes: [Targets](https://docs.rs/tracing-subscriber/0.3.18/tracing_subscriber/filter/targets/struct.Targets.html#).
+To reduce potential friction by using custom targets we mimic what module paths would look like by using `::`. 
+
+``
+
+### P2P
+
+| Target                        | Description                                             |
+|-------------------------------|---------------------------------------------------------|
+| `p2p`                         | Anything to do with the peer to peer network.           |
+| `p2p::address_book`           | The address book of P2P peers.                          |
+| `p2p::connection`             | Anything to do with P2P connections.                    |
+| `p2p::connection::levin`      | The levin protocol parser.                              |
+| `p2p::connection::handshaker` | The handshaker handles doing handshakes with new peers. |
+| `p2p::connection::task`       | The task that maintains the peer connection.            |
+| `p2p::peer_set`               | Contains connected peers.                               |
+| `p2p::outbound_maintainer`    | Maintains the outbound connection count.                |
+| `p2p::inbound_server`         | Handles incoming P2P connections.                       |
+| `p2p::block_downloader`       | Downloads blocks when we fall behind.                   |
+
+### Dandelion
+
+| Target                    | Description                     |
+|---------------------------|---------------------------------|
+| `dandelion`               | Anything to do with dandelion++ |
+| `dandelion::pool_manager` | The dandelion pool manager.     |
+| `dandelion::router`       | The dandelion router.           |
+
+### Consensus
+
+| Target                      | Description                    |
+|-----------------------------|--------------------------------|
+| `consensus`                 | Anything to do with consensus. |
+| `consensus::block_verifier` | Block verification.            |
+| `consensus::tx_verifier`    | Transaction verification.      |
+
+### Storage
+
+| Target                | Description                      |
+|-----------------------|----------------------------------|
+| `storage`             | Anything to do with storage.     |
+| `storage::service`    | The storage service abstraction. |
+| `storage::blockchain` | Blockchain storage.              |
+| `storage::txpool`     | Txpool storage.                  |
+
+### cuprated
+
+| Target       | Description                      |
+|--------------|----------------------------------|
+| `blockchain` |      |
+| `txpool`     |  |
+|              |  |