Monitoring: metric history, one edition of metrics, and x:Metric over the stored samples (MON-4 to MON-7, MON-9, MON-17, MON-39)

Every node writes a sample per metric on metricsCollectionInterval:
counters as the increase since its last sample, gauges always, histograms
as totals when changed. Samples are x:Metric in the registry's encoding
under the telemetry key class, ids time-ordered. x:Metric/get and /query
read them with metric and timestamp filters and full paging, hide what's
past holdMetricsFor, and the data purge deletes it. The is_enterprise
split is gone, so every gauge and histogram is collected and exported, and
queue.count is set from the queue itself. The shared metrics suite runs.

crates/utils/src/snowflake.rs

@@ -96,6 +96,12 @@ impl SnowflakeIdGenerator {
             })
     }
 
+    // inbuxa: the first id of a UNIX second, so ids can be searched by time
+    // (monitoring history)
+    pub fn first_id_at(timestamp: u64) -> u64 {
+        (timestamp.saturating_sub(DEFAULT_EPOCH) * 1000) << (SEQUENCE_LEN + NODE_ID_LEN)
+    }
+
     pub fn to_timestamp(id: u64) -> u64 {
         (id >> (SEQUENCE_LEN + NODE_ID_LEN)) / 1000 + DEFAULT_EPOCH
     }