Track memory bytes per container

We have a problem where the gauge without labels is created and always
set to zero. I don't want this to be there but haven't figured out how
to get rid of it yet.

The answer might have to be that we change the prometheus library we're
using. This one has not had updates in a while.

src/tiny_container_manager/docker.nim

@@ -64,6 +64,7 @@ type
   DockerStats* = object
     CPUPerc*: float
     Name*: string
+    MemBytes*: int
     MemPerc*: float
     PIDs*: int
 
@@ -173,6 +174,7 @@ proc getContainerStats*(name: string, oneShot = false): Option[DockerStats] =
     return some(DockerStats(
       CPUPerc: cpu_usage_percent,
       Name: name,
+      MemBytes: used_memory,
       MemPerc: memory_usage_percent,
       PIDs: pids
     ))
@@ -220,6 +222,7 @@ proc observeDockerStats*() =
   for s in stats:
     metrics.containerCPUPerc.labels(s.Name).set(s.CPUPerc)
     metrics.containerMemPerc.labels(s.Name).set(s.MemPerc)
+    metrics.containerMemBytes.labels(s.Name).set(s.MemBytes)
     metrics.containerPIDs.labels(s.Name).set(s.PIDs)
 
 proc main() =
@@ -230,7 +233,7 @@ proc main() =
 
 when isMainModule:
   #echo getContainers()
-  # logInfo $getContainerStats("nginx")
+  logInfo $getContainerStats("nginx")
   # logInfo $(waitFor getDockerCLIStats())
   logInfo $getDockerStats()
   observeDockerStats()

src/tiny_container_manager/metrics.nim

@@ -1,5 +1,6 @@
 import
-  prometheus as prom
+  prometheus as prom,
+  nim_utils/logline
 
 export prom
 
@@ -39,19 +40,26 @@ var nginxConfigsWritten* {.global.} = prom.newCounter(
 var containerCPUPerc* {.global.} = prom.newGauge(
   "tcm_container_cpu_perc",
   "",
-  @["site"]
+  labelNames = @["site"]
 )
 
 var containerMemPerc* {.global.} = prom.newGauge(
   "tcm_container_mem_perc",
   "",
-  @["site"]
+  labelNames = @["site"]
+)
+
+var containerMemBytes* {.global.} = prom.newGauge(
+  "tcm_container_mem_bytes",
+  "",
+  labelNames = @["site"],
+  unit = Unit.Bytes
 )
 
 var containerPIDs* {.global.} = prom.newGauge(
   "tcm_container_pids",
   "",
-  @["site"]
+  labelNames = @["site"]
 )
 
 var letsEncryptBackupsDeleted* {.global.} = prom.newCounter(