sqlite: Use an in-memory database when delay_ping_lifetime_io=true

This restores `delay_ping_lifetime_io` behavior (not touching disk until
`persist_ping_lifetime_data` is called, or in auto-mode when the
counter/time is hitting the limit)

The local benchmark shows it's twice as fast compared to current `main`
(so compared to always hitting disk).

Author: badboy

glean-core/rlb-tests/src/bin/delayed-ping-data.rs

@@ -13,7 +13,7 @@ use flate2::read::GzDecoder;
 use glean::{ClientInfoMetrics, ConfigurationBuilder, net, private::PingType};
 
 pub mod glean_metrics {
-    use glean::{CommonMetricData, Lifetime, private::CounterMetric};
+    use glean::{CommonMetricData, Lifetime, private::*};
 
     #[allow(non_upper_case_globals)]
     pub static sample_counter: once_cell::sync::Lazy<CounterMetric> =
@@ -27,6 +27,24 @@ pub mod glean_metrics {
                 ..Default::default()
             })
         });
+
+    #[allow(non_upper_case_globals)]
+    pub static labeled_counter: once_cell::sync::Lazy<LabeledMetric<CounterMetric>> =
+        once_cell::sync::Lazy::new(|| {
+            LabeledMetric::new(
+                glean::LabeledMetricData::Common {
+                    cmd: CommonMetricData {
+                        name: "labeled_counter".into(),
+                        category: "test.metrics".into(),
+                        send_in_pings: vec!["prototype".into()],
+                        disabled: false,
+                        lifetime: Lifetime::Ping,
+                        ..Default::default()
+                    },
+                },
+                None,
+            )
+        });
 }
 
 #[derive(Debug)]
@@ -123,11 +141,13 @@ fn main() {
     match &*state {
         "accumulate_one_and_pretend_crash" => {
             log::debug!("incrementing by 1. exiting without shutdown.");
-            glean_metrics::sample_counter.add(1)
+            glean_metrics::sample_counter.add(1);
+            glean_metrics::labeled_counter.get("label").add(1);
         }
         "accumulate_ten_and_orderly_shutdown" => {
             log::debug!("incrementing by 10, waiting, shutdown. should trigger a flush.");
             glean_metrics::sample_counter.add(10);
+            glean_metrics::labeled_counter.get("label").add(10);
             glean::shutdown();
         }
         "submit_ping" => {

glean-core/rlb-tests/tests/it.rs

@@ -79,6 +79,10 @@ fn delayed_ping_data() {
     let mut lines = payload.lines();
     assert!(lines.any(|line| line.contains("\"url\":") && line.contains("/prototype/")));
     assert!(payload.contains("\"test.metrics.sample_counter\":10"));
+    assert!(
+        payload.contains("\"test.metrics.labeled_counter\":{\"label\":10}}}"),
+        "{payload}"
+    );
 }
 
 #[cfg(unix)]