Add surfacers examples.

examples/surfacers/default_surfacers.cfg

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+# This config file doesn't specify any surfacers. In this case, following two
+# surfacers are added automatically:
+#
+# surfacer {
+#   type: FILE   
+# }
+#
+# sufacer {
+#   type: PROMETHEUS    
+# }
+#
+# Note: If any surfacer is configured explicitly, default surfacers will not be
+# added automatically.
+#
+# File surfacer writes metrics to stdout (you can specify a file as well) in
+# the following format:
+# https://github.com/google/cloudprober/blob/ffb22ec61142a65180c42dce9b78c635e596e73f/metrics/eventmetrics.go#L192
+#
+# Prometheus surfacer exports metrics in prometheus-compatible format at the
+# URL: http://<cloudprober-host>:<cloudprober-port|default:9313>/metrics
+#
+probe {
+    name: "http_google"
+    type: HTTP
+    targets {
+        host_names: "www.google.com"
+    }
+    interval_msec: 10000    # Probe every 10s
+    timeout_msec: 1000
+}

examples/surfacers/stackdriver_surfacer.cfg

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+# This config file adds two surfacers: prometheus and stackdriver. Prometheus
+# surfacer exports data for all probes, while stackdriver exports data only
+# from one probe.
+#
+# NOTE: We need to explicitly specify prometheus surfacer since stackdriver
+# surfacer is configured.
+probe {
+    name: "http_google"
+    type: HTTP
+    targets {
+        host_names: "www.google.com"
+    }
+}
+probe {
+    name: "http_aws"
+    type: HTTP
+    targets {
+        host_names: "aws.amazon.com"
+    }
+}
+surfacer {
+    type: PROMETHEUS
+}
+
+# Surfacer to export data to Google Cloud Monitoring (Stackdriver). It assumes
+# that cloudprober is running on GCP (that's why no project specification), and
+# VMs or GKE nodes have write access for Stackdriver.
+# More on stackdriver surfacer:
+# https://cloudprober.org/surfacers/stackdriver/
+surfacer {
+    type: STACKDRIVER
+
+    # Exports data only from the "http_aws" probe.
+    stackdriver_surfacer {
+        allowed_metrics_regex: ".*\/http_aws\/.*"
+    }
+}