Move oxql from oxdb to mainline omdb

Why?:

In relation to [network observability work](https://github.com/orgs/oxidecomputer/projects/55/views/1?filterQuery=&pane=issue&itemId=68336554),
this makes the [`oxql`](https://rfd.shared.oxide.computer/rfd/0463) interactive
query repl accessible via omdb, as we start to give users and ourselves the
ability to query timeseries and metrics more easily.

Includes:
  * Removes `oxql` from `oxdb`.
  * If no URL is given to `omdb oxql`, it will leverage internal DNS.
  * Update the oximeter omdb call (for listing producers) to leverage internal.
    DNS if no URL is given.
  * Update command/output tests/generations.

Notes:
  * The oxql client still expects an socket address as liked it typed
    specifically v.s. a String. Instead, upon running the `omdb oxql` command,
    we take in a URL String and parse it into the socket address directly.

.gitignore

@@ -17,3 +17,4 @@ tags
 .falcon/*
 .img/*
 connectivity-report.json
+*.local

dev-tools/omdb/Cargo.toml

@@ -37,6 +37,7 @@ nexus-types.workspace = true
 omicron-common.workspace = true
 omicron-uuid-kinds.workspace = true
 oximeter-client.workspace = true
+oximeter-db.workspace = true
 # See omicron-rpaths for more about the "pq-sys" dependency.
 pq-sys = "*"
 ratatui.workspace = true
@@ -51,6 +52,7 @@ tabled.workspace = true
 textwrap.workspace = true
 tokio = { workspace = true, features = [ "full" ] }
 unicode-width.workspace = true
+url.workspace = true
 uuid.workspace = true
 ipnetwork.workspace = true
 omicron-workspace-hack.workspace = true

dev-tools/omdb/src/bin/omdb/main.rs

@@ -50,6 +50,7 @@ mod helpers;
 mod mgs;
 mod nexus;
 mod oximeter;
+mod oxql;
 mod sled_agent;
 
 #[tokio::main]
@@ -66,7 +67,8 @@ async fn main() -> Result<(), anyhow::Error> {
         OmdbCommands::Db(db) => db.run_cmd(&args, &log).await,
         OmdbCommands::Mgs(mgs) => mgs.run_cmd(&args, &log).await,
         OmdbCommands::Nexus(nexus) => nexus.run_cmd(&args, &log).await,
-        OmdbCommands::Oximeter(oximeter) => oximeter.run_cmd(&log).await,
+        OmdbCommands::Oximeter(oximeter) => oximeter.run_cmd(&args, &log).await,
+        OmdbCommands::Oxql(oxql) => oxql.run_cmd(&args, &log).await,
         OmdbCommands::SledAgent(sled) => sled.run_cmd(&args, &log).await,
         OmdbCommands::CrucibleAgent(crucible) => crucible.run_cmd(&args).await,
     }
@@ -269,6 +271,8 @@ enum OmdbCommands {
     Nexus(nexus::NexusArgs),
     /// Query oximeter collector state
     Oximeter(oximeter::OximeterArgs),
+    /// Enter the Oximeter Query Language shell for interactive querying.
+    Oxql(oxql::OxqlArgs),
     /// Debug a specific Sled
     SledAgent(sled_agent::SledAgentArgs),
 }

dev-tools/omdb/src/bin/omdb/oximeter.rs

@@ -5,6 +5,7 @@
 //! omdb commands that query oximeter
 
 use crate::helpers::CONNECTION_OPTIONS_HEADING;
+use crate::Omdb;
 use anyhow::Context;
 use clap::Args;
 use clap::Subcommand;
@@ -24,12 +25,10 @@ pub struct OximeterArgs {
     #[arg(
         long,
         env = "OMDB_OXIMETER_URL",
-        // This can't be global = true (i.e. passed in later in the
-        // command-line) because global options can't be required. If this
-        // changes to being optional, we should set global = true.
+        global = true,
         help_heading = CONNECTION_OPTIONS_HEADING,
     )]
-    oximeter_url: String,
+    oximeter_url: Option<String>,
 
     #[command(subcommand)]
     command: OximeterCommands,
@@ -43,15 +42,41 @@ enum OximeterCommands {
 }
 
 impl OximeterArgs {
-    fn client(&self, log: &Logger) -> Client {
-        Client::new(
-            &self.oximeter_url,
+    async fn client(
+        &self,
+        omdb: &Omdb,
+        log: &Logger,
+    ) -> Result<Client, anyhow::Error> {
+        let oximeter_url = match &self.oximeter_url {
+            Some(cli_or_env_url) => cli_or_env_url.clone(),
+            None => {
+                eprintln!(
+                    "note: Oximeter URL not specified.  Will pick one from DNS."
+                );
+                let addr = omdb
+                    .dns_lookup_one(
+                        log.clone(),
+                        internal_dns::ServiceName::Oximeter,
+                    )
+                    .await?;
+                format!("http://{}", addr)
+            }
+        };
+        eprintln!("note: using Oximeter URL {}", &oximeter_url);
+
+        let client = Client::new(
+            &oximeter_url,
             log.new(slog::o!("component" => "oximeter-client")),
-        )
+        );
+        Ok(client)
     }
 
-    pub async fn run_cmd(&self, log: &Logger) -> anyhow::Result<()> {
-        let client = self.client(log);
+    pub async fn run_cmd(
+        &self,
+        omdb: &Omdb,
+        log: &Logger,
+    ) -> anyhow::Result<()> {
+        let client = self.client(omdb, log).await?;
         match self.command {
             OximeterCommands::ListProducers => {
                 self.list_producers(client).await