Add energy metrics to load-watcher

[jpedro1992]

What type of PR is this?

Addition of energy metrics in load-watcher.

Related issue

#72

Summary

Additional metrics:

promScaphHostPower           = "scaph_host_power_microwatts"
promScaphHostJoules          = "scaph_host_energy_microjoules"
promKeplerHostCoreJoules     = "kepler_node_core_joules_total"
promKeplerHostUncoreJoules   = "kepler_node_uncore_joules_total"
promKeplerHostDRAMJoules     = "kepler_node_dram_joules_total"
promKeplerHostPackageJoules  = "kepler_node_package_joules_total"
promKeplerHostOtherJoules    = "kepler_node_other_joules_total"
promKeplerHostGPUJoules      = "kepler_node_gpu_joules_total"
promKeplerHostPlatformJoules = "kepler_node_platform_joules_total"
promKeplerHostEnergyStat     = "kepler_node_energy_stat"

[lenhattan86]

I think we should use switch case for this.

[jpedro1992]

I agree. What about something like this:

switch metric {
	case promCpuMetric: // CPU metrics
		metricType = watcher.CPU
	case promMemMetric: // Memory metrics
		metricType = watcher.Memory
	case promDiskIOMetric: // Storage metrics
		metricType = watcher.Storage
	case promScaphHostPower, promScaphHostJoules, // Energy-related metrics
		promKeplerHostCoreJoules, promKeplerHostUncoreJoules,
		promKeplerHostDRAMJoules, promKeplerHostPackageJoules,
		promKeplerHostOtherJoules, promKeplerHostGPUJoules,
		promKeplerHostPlatformJoules, promKeplerHostEnergyStat: 
		metricType = watcher.Energy
	case promTransBandMetric, promTransBandDropMetric, // Bandwidth-related metrics
	promRecBandMetric, promRecBandDropMetric:
		metricType = watcher.Bandwidth
	default:
		metricType = watcher.Unknown
	}

[lenhattan86]

looks good to me.