Add metrics relating to service discovery activity #80
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Replace some logging with Prometheus metrics allowing service discovery
activity to be monitored.
Metrics will be available at /metrics on HTTP port 9999.
prometheus_ecs_sd_discovery_duration_seconds
: How long the most recentservice discovery process took.
prometheus_ecs_sd_discovery_total
: How many discoveries have been performedsince the application started.
prometheus_ecs_sd_discovery_failure_total
: How many discoveries have failedsince the application started.
prometheus_ecs_sd_discovery_target_total
: How many targets have beendiscovered since the application started.