chronos-based metrics (#2432)

This opens up the road for removing `-d:insecure` for metrics.

beacon_chain/nimbus_beacon_node.nim

@@ -13,7 +13,8 @@ import
 
   # Nimble packages
   stew/[objects, byteutils, endians2, io2], stew/shims/macros,
-  chronos, confutils, metrics, json_rpc/[rpcclient, rpcserver, jsonmarshal],
+  chronos, confutils, metrics, metrics/chronos_httpserver,
+  json_rpc/[rpcclient, rpcserver, jsonmarshal],
   chronicles, bearssl, blscurve,
   json_serialization/std/[options, sets, net], serialization/errors,
 
@@ -1637,7 +1638,7 @@ proc doRunBeaconNode(config: var BeaconNodeConf, rng: ref BrHmacDrbgContext) =
       let metricsAddress = config.metricsAddress
       notice "Starting metrics HTTP server",
         url = "http://" & $metricsAddress & ":" & $config.metricsPort & "/metrics"
-      metrics.startHttpServer($metricsAddress, config.metricsPort)
+      startMetricsHttpServer($metricsAddress, config.metricsPort)
     else:
       warn "Metrics support disabled, see https://status-im.github.io/nimbus-eth2/metrics-pretty-pictures.html#simple-metrics"
 

vendor/nim-chronos

@@ -1 +1 @@
-Subproject commit 03707426e43d03cccc1de2e7284de168b79f7bf6
+Subproject commit c8eefb9382a786993fc703386b0bd446ecf9c037

vendor/nim-metrics

@@ -1 +1 @@
-Subproject commit 22a3867341f7b0a9d55661b41d7ee5febe35c86b
+Subproject commit 105af2bfbd4896e8b4086d3dff1e6c187e9d0a41

vendor/nim-stew

@@ -1 +1 @@
-Subproject commit 42475fd2f1919acd11be2fdc75fd6e2cefc99e90
+Subproject commit 6bcb21184aeb96ce6c62e187a64d678b74609f1e