compute_ctl: Add more detailed tracing spans to startup subroutines (#10979)

In local dev environment, these steps take around 100 ms, and they are
in the critical path of a compute startup on a compute pool hit. I don't
know if it's like that in production, but as first step, add tracing
spans to the functions so that they can be measured more easily.

compute_tools/src/compute.rs

@@ -546,6 +546,7 @@ impl ComputeNode {
 
     // Fast path for sync_safekeepers. If they're already synced we get the lsn
     // in one roundtrip. If not, we should do a full sync_safekeepers.
+    #[instrument(skip_all)]
     pub fn check_safekeepers_synced(&self, compute_state: &ComputeState) -> Result<Option<Lsn>> {
         let start_time = Utc::now();
 

compute_tools/src/disk_quota.rs

@@ -1,9 +1,11 @@
 use anyhow::Context;
+use tracing::instrument;
 
 pub const DISK_QUOTA_BIN: &str = "/neonvm/bin/set-disk-quota";
 
 /// If size_bytes is 0, it disables the quota. Otherwise, it sets filesystem quota to size_bytes.
 /// `fs_mountpoint` should point to the mountpoint of the filesystem where the quota should be set.
+#[instrument]
 pub fn set_disk_quota(size_bytes: u64, fs_mountpoint: &str) -> anyhow::Result<()> {
     let size_kb = size_bytes / 1024;
     // run `/neonvm/bin/set-disk-quota {size_kb} {mountpoint}`

compute_tools/src/swap.rs

@@ -1,10 +1,11 @@
 use std::path::Path;
 
 use anyhow::{anyhow, Context};
-use tracing::warn;
+use tracing::{instrument, warn};
 
 pub const RESIZE_SWAP_BIN: &str = "/neonvm/bin/resize-swap";
 
+#[instrument]
 pub fn resize_swap(size_bytes: u64) -> anyhow::Result<()> {
     // run `/neonvm/bin/resize-swap --once {size_bytes}`
     //