migrations: add send-metrics setting-generator

AWS variants now generate the `settings.metrics.send-metrics` setting
based on partition information gathered from shibaken.

Release.toml

@@ -133,4 +133,5 @@ version = "1.8.0"
 "(1.8.0, 1.9.0)" = [
     "migrate_v1.9.0_ntp-affected-services.lz4",
     "migrate_v1.9.0_shibaken-admin-userdata-semantics.lz4",
+    "migrate_v1.9.0_shibaken-send-metrics.lz4",
 ]

sources/Cargo.toml

@@ -63,6 +63,7 @@ members = [
     "api/migration/migrations/v1.8.0/public-control-container-v0-6-1",
     "api/migration/migrations/v1.9.0/ntp-affected-services",
     "api/migration/migrations/v1.9.0/shibaken-admin-userdata-semantics",
+    "api/migration/migrations/v1.9.0/shibaken-send-metrics",
 
     "bottlerocket-release",
 

sources/api/migration/migrations/v1.9.0/shibaken-send-metrics/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "shibaken-send-metrics"
+version = "0.1.0"
+authors = ["Sean P. Kelly <seankell@amazon.com>"]
+license = "Apache-2.0 OR MIT"
+edition = "2018"
+publish = false
+
+[dependencies]
+migration-helpers = { path = "../../../migration-helpers", version = "0.1.0"}

sources/api/migration/migrations/v1.9.0/shibaken-send-metrics/src/main.rs

@@ -0,0 +1,24 @@
+#![deny(rust_2018_idioms)]
+
+use migration_helpers::common_migrations::{AddMetadataMigration, SettingMetadata};
+use migration_helpers::{migrate, Result};
+use std::process;
+
+/// We added a `setting-generator` for `settings.metrics.send-metrics` on AWS variants.
+/// This migration will do nothing on upgrade, but will remove the metadata if present on downgrade.
+fn run() -> Result<()> {
+    migrate(AddMetadataMigration(&[SettingMetadata {
+        setting: "settings.metrics.send-metrics",
+        metadata: &["setting-generator"],
+    }]))
+}
+
+// Returning a Result from main makes it print a Debug representation of the error, but with Snafu
+// we have nice Display representations of the error, so we wrap "main" (run) and print any error.
+// https://github.com/shepmaster/snafu/issues/110
+fn main() {
+    if let Err(e) = run() {
+        eprintln!("{}", e);
+        process::exit(1);
+    }
+}