client metrics

 Places to add tagged metrics in Nomad client:                                                                                                                                                                       
                                                                                
- Task runner                                                                   
    - Emit resource usage stats of tasks                                        
      - key: "client", "allocs", alloc.Job.Name, alloc.TaskGroup, alloc.ID, task.Name, "memory", "rss"
        value: ResourceUsage.MemoryStats.RSS                                    
        proposed tag: "memory"                                                  
                                                                                
      - key: "client", "allocs", alloc.Job.Name, alloc.TaskGroup, alloc.ID, task.Name, "memory", "cache"
        value: ResourceUsage.MemoryStats.Cache                                  
        proposed tag: "memory"                                                  
                                                                                
      - key: "client", "allocs", alloc.Job.Name, alloc.TaskGroup, alloc.ID, task.Name, "memory", "swap",
        value: ResourceUsage.MemoryStats.Swap                                   
        proposed tag: "memory"                                                  
                                                                                
      - key: "client", "allocs", alloc.Job.Name, alloc.TaskGroup, alloc.ID, task.Name, "memory", "max_usage"
        value: ResourceUsage.MemoryStats.MaxUsage                               
        proposed tag: "memory"                                                  
                                                                                
      - key: "client", "allocs", alloc.Job.Name, alloc.TaskGroup, alloc.ID, task.Name, "memory", "kernel_usage"
        value: ResourceUsage.MemoryStats.KernelUsage                            
        proposed tag: "memory"                                                  
                                                                                
      - key: "client", "allocs", alloc.Job.Name, alloc.TaskGroup, alloc.ID, task.Name, "memory", "kernel_max_usage"
        value: ResourceUsage.MemoryStats.KernelMaxUsage                         
        proposed tag: "memory"                                                  
                                                                                
      - key: "client", "allocs", alloc.Job.Name, alloc.TaskGroup, alloc.ID, task.Name, "cpu", "total_percent"
        value: ResourceUsage.CpuStats.Percent                                   
        proposed tag: "cpu"                                                     
                                                                                
      - key: "client", "allocs", alloc.Job.Name, alloc.TaskGroup, alloc.ID, task.Name, "cpu", "system"
        value: ResourceUsage.CpuStats.SystemMode                                
        proposed tag: "cpu"                                                     
                                                                                
      - key: "client", "allocs", alloc.Job.Name, alloc.TaskGroup, alloc.ID, task.Name, "cpu", "user"
        value: ResourceUsage.CpuStats.UserMode                                  
        proposed tag: "cpu"       
        
        - key: "client", "allocs", alloc.Job.Name, alloc.TaskGroup, alloc.ID, task.Name, "cpu", "throttled_time"                                                                                                      
        value: ResourceUsage.CpuStats.ThrottledTime                             
        proposed tag: "cpu"                                                     
                                                                                
      - key: "client", "allocs", alloc.Job.Name, alloc.TaskGroup, alloc.ID, task.Name, "cpu", "throttled_periods"
        value: ResourceUsage.CpuStats.ThrottledPeriods                          
        proposed tag: "cpu"                                                     
                                                                                
      - key: "client", "allocs", alloc.Job.Name, alloc.TaskGroup, alloc.ID, task.Name, "cpu", "total_ticks"
        value: ResourceUsage.CpuStats.TotalTicks                                
        proposed tag: "cpu"                                                     
                                                                                
- Client                                                                        
                                                                                
  - emitHostStats pushes host resource usage stats to remote metrics collection sinks
    - key: "client", "host", "memory", nodeID, "total"                          
      value: hStats.Memory.Total                                                
      proposed tag: "memory"                                                    
                                                                                
    - key: "client", "host", "memory", nodeID, "available"                      
      value: hStats.Memory.Available                                            
      proposed tag: "memory"                                                    
                                                                                
    - key: "client", "host", "memory", nodeID, "used"                           
      value: hStats.Memory.Used                                                 
      proposed tag: "memory"                                                    
                                                                                
    - key: "client", "host", "memory", nodeID, "free"                           
      value: hStats.Memory.Free                                                 
      proposed tag: "memory"                                                    
                                                                                
    - key: "uptime"                                                             
      value: hStats.Uptime                                                      
      proposed tag: "stats"                                                     
                                                                                
    - key: client", "host", "cpu", nodeID, cpu.CPU, "total"                     
      value: cpu.Total                                                          
      proposed tag: "cpu"                                                       
                                                                                
    
    - key: client", "host", "cpu", nodeID, cpu.CPU, "user"                      
      value: cpu.User                                                           
      proposed tag: "cpu"                                                       
                                                                                
    - key: client", "host", "cpu", nodeID, cpu.CPU, "idle"                      
      value: cpu.Idle                                                           
      proposed tag: "cpu"                                                       
                                                                                
    - key: client", "host", "cpu", nodeID, cpu.CPU, "system"                    
      value: cpu.System                                                         
      proposed tag: "cpu"                                                       
                                                                                
    - key: client", "host", "disk", nodeID, disk.Device, "size"                 
      value: disk.Size                                                          
      proposed tag: "disk"                                                      
                                                                                
    - key: client", "host", "disk", nodeID, disk.Device, "used"                 
      value: disk.Used                                                          
      proposed tag: "disk"                                                      
                                                                                
    - key: client", "host", "disk", nodeID, disk.Device, "available"            
      value: disk.Available                                                     
      proposed tag: "disk"                                                      
                                                                                
    - key: client", "host", "disk", nodeID, disk.Device, "used_percent"         
      value: disk.UsedPercent                                                   
      proposed tag: "disk"                                                      
                                                                                
    - key: client", "host", "disk", nodeID, disk.Device, "inodes_percent"       
      value: disk.InodesUsedPercent                                             
      proposed tag: "disk"                                                      
                                                                                
  // Emit allocated                                                              
    - key: client", "allocated", "memory"                                       
      value: nodeID allocated.MemoryMB 
      proposed tag: "memory"  
          
    - key: client", "allocated", "disk"                                         
      value: nodeID allocated.DiskMB                                            
      proposed tag: "disk"                                                      
                                                                                
    - key: client", "allocated", "cpu", nodeID,                                 
      value: allocated.CPU                                                      
      proposed tag: "cpu"                                                       
                                                                                
    - key: client", "allocated", "iops", nodeID                                 
      value: allocated.IOPS                                                     
      proposed tag: "iops"                                                      
                                                                                
                                                                                
  // for every allocation Network:                                               
    - key: "client", "allocated", "network", Device, nodeID                     
      value: allocation network MBits                                           
      proposed tag: "network"                                                   
                                                                                
  // emit lower volume client data                                              
    - key: "client", "allocations", "migrating", nodeID                         
      value: migrating                                                          
      proposed tag: "allocations"                                               
                                                                                
    - key: "client", "allocations", "blocked", nodeID                           
      value: blocked                                                            
      proposed tag: "allocations"                                               
                                                                                
    - key: "client", "allocations", "pending", nodeID                           
      value: pending                                                            
      proposed tag: "allocations"                                               
                                                                                
    - key: "client", "allocations", "running", nodeID                           
      value: running                                                            
      proposed tag: "allocations"                                               
                                                                                
    - key: "client", "allocations", "terminal", nodeID                          
      value: terminal                                                           
      proposed tag: "allocations"