chore(extension-metrics): use a mock-up pushgateway for testing

extensions/metrics/README.md

@@ -3,12 +3,12 @@
 This module contains a component that reports metrics of Node.js, LoopBack
 framework, and your application to [Prometheus](https://prometheus.io/).
 
-## Stability - Experimental
+## Stability: :warning:Experimental:warning:
 
 > Experimental packages provide early access to advanced or experimental
 > functionality to get community feedback. Such modules are published to npm
-> using `0.x.y` versions. Their APIs may subject to breaking changes in future
-> releases.
+> using `0.x.y` versions. Their APIs and functionality may be subject to
+> breaking changes in future releases.
 
 ## Installation
 
@@ -92,81 +92,43 @@ information for the Node.js process as well as LoopBack method invocations.
 # HELP process_cpu_user_seconds_total Total user CPU time spent in seconds.
 # TYPE process_cpu_user_seconds_total counter
 process_cpu_user_seconds_total 0.132181 1564508354524
-</pre>
-<pre>
 # HELP process_cpu_system_seconds_total Total system CPU time spent in seconds.
 # TYPE process_cpu_system_seconds_total counter
 process_cpu_system_seconds_total 0.023608999999999998 1564508354524
-</pre>
-
-<pre>
 # HELP process_cpu_seconds_total Total user and system CPU time spent in seconds.
 # TYPE process_cpu_seconds_total counter
 process_cpu_seconds_total 0.15578999999999998 1564508354524
-</pre>
-
-<pre>
 # HELP process_start_time_seconds Start time of the process since unix epoch in seconds.
 # TYPE process_start_time_seconds gauge
 process_start_time_seconds 1564508343
-</pre>
-
-<pre>
 # HELP process_resident_memory_bytes Resident memory size in bytes.
 # TYPE process_resident_memory_bytes gauge
 process_resident_memory_bytes 61800448 1564508354524
-</pre>
-
-<pre>
 # HELP nodejs_eventloop_lag_seconds Lag of event loop in seconds.
 # TYPE nodejs_eventloop_lag_seconds gauge
 nodejs_eventloop_lag_seconds 0.002172946 1564508354526
-</pre>
-
-<pre>
 # HELP nodejs_active_handles Number of active libuv handles grouped by handle type. Every handle type is C++ class name.
 # TYPE nodejs_active_handles gauge
 nodejs_active_handles{type="WriteStream"} 2 1564508354524
 nodejs_active_handles{type="Server"} 1 1564508354524
 nodejs_active_handles{type="Socket"} 2 1564508354524
-</pre>
-
-<pre>
 # HELP nodejs_active_handles_total Total number of active handles.
 # TYPE nodejs_active_handles_total gauge
 nodejs_active_handles_total 5 1564508354526
-</pre>
-
-<pre>
 # HELP nodejs_active_requests Number of active libuv requests grouped by request type. Every request type is C++ class name.
 # TYPE nodejs_active_requests gauge
-</pre>
-
-<pre>
 # HELP nodejs_active_requests_total Total number of active requests.
 # TYPE nodejs_active_requests_total gauge
 nodejs_active_requests_total 0 1564508354526
-</pre>
-
-<pre>
 # HELP nodejs_heap_size_total_bytes Process heap size from node.js in bytes.
 # TYPE nodejs_heap_size_total_bytes gauge
 nodejs_heap_size_total_bytes 27545600 1564508354526
-</pre>
-
-<pre>
 # HELP nodejs_heap_size_used_bytes Process heap size used from node.js in bytes.
 # TYPE nodejs_heap_size_used_bytes gauge
 nodejs_heap_size_used_bytes 23788272 1564508354526
-</pre>
-
-<pre>
 # HELP nodejs_external_memory_bytes Nodejs external memory size in bytes.
 # TYPE nodejs_external_memory_bytes gauge
 nodejs_external_memory_bytes 1234918 1564508354526
-</pre>
-
-<pre>
 # HELP nodejs_heap_space_size_total_bytes Process heap space size total from node.js in bytes.
 # TYPE nodejs_heap_space_size_total_bytes gauge
 nodejs_heap_space_size_total_bytes{space="read_only"} 524288 1564508354526
@@ -177,9 +139,6 @@ nodejs_heap_space_size_total_bytes{space="map"} 1576960 1564508354526
 nodejs_heap_space_size_total_bytes{space="large_object"} 6758400 1564508354526
 nodejs_heap_space_size_total_bytes{space="code_large_object"} 49152 1564508354526
 nodejs_heap_space_size_total_bytes{space="new_large_object"} 0 1564508354526
-</pre>
-
-<pre>
 # HELP nodejs_heap_space_size_used_bytes Process heap space size used from node.js in bytes.
 # TYPE nodejs_heap_space_size_used_bytes gauge
 nodejs_heap_space_size_used_bytes{space="read_only"} 31712 1564508354526
@@ -190,9 +149,6 @@ nodejs_heap_space_size_used_bytes{space="map"} 918480 1564508354526
 nodejs_heap_space_size_used_bytes{space="large_object"} 6726408 1564508354526
 nodejs_heap_space_size_used_bytes{space="code_large_object"} 3456 1564508354526
 nodejs_heap_space_size_used_bytes{space="new_large_object"} 0 1564508354526
-</pre>
-
-<pre>
 # HELP nodejs_heap_space_size_available_bytes Process heap space size available from node.js in bytes.
 # TYPE nodejs_heap_space_size_available_bytes gauge
 nodejs_heap_space_size_available_bytes{space="read_only"} 492264 1564508354526
@@ -203,31 +159,16 @@ nodejs_heap_space_size_available_bytes{space="map"} 657072 1564508354526
 nodejs_heap_space_size_available_bytes{space="large_object"} 0 1564508354526
 nodejs_heap_space_size_available_bytes{space="code_large_object"} 0 1564508354526
 nodejs_heap_space_size_available_bytes{space="new_large_object"} 1047952 1564508354526
-</pre>
-
-<pre>
 # HELP nodejs_version_info Node.js version info.
 # TYPE nodejs_version_info gauge
 nodejs_version_info{version="v12.4.0",major="12",minor="4",patch="0"} 1
-</pre>
-
-<pre>
 # HELP loopback_invocation_duration_seconds method invocation
 # TYPE loopback_invocation_duration_seconds gauge
-</pre>
-
-<pre>
 # HELP loopback_invocation_duration_histogram method invocation histogram
 # TYPE loopback_invocation_duration_histogram histogram
-</pre>
-
-<pre>
 # HELP loopback_invocation_total method invocation counts
 # TYPE loopback_invocation_total counter
 loopback_invocation_total 1
-</pre>
-
-<pre>
 # HELP loopback_invocation_duration_summary method invocation summary
 # TYPE loopback_invocation_duration_summary summary
 </pre>