syz-manager: add prometheus metrics

* syz-manager: add prometheus metrics

Add prometheus metrics client to syz-manager.
Expose metrics on a new port defined in mgrconfig.

Allows for prometheus to scrape metrics from syz-manager.

* syz-manager: expose metrics endpoint in http server

.gitignore : remove local .img path

* mgrconfig: remove unnecessary config option

* syz-manager: update stats to use gaugefunc

added docs for prometheus exported metrics
added more gaugefunc metrics

Signed-off-by: Palash Oswal <oswalpalash@gmail.com>

* syz-manager: minor changes for CI tests

added periods to comments and renamed go variables

Signed-off-by: Palash Oswal <oswalpalash@gmail.com>

* syz-manager: re-position prometheus counter declaration

docs updated with PR comments

Signed-off-by: Palash Oswal <oswalpalash@gmail.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/vendor/github.com/prometheus/procfs/README.md b/vendor/github.com/prometheus/procfs/README.md
new file mode 100644
index 000000000..209549471
--- /dev/null
+++ b/vendor/github.com/prometheus/procfs/README.md
@@ -0,0 +1,11 @@
+# procfs
+
+This procfs package provides functions to retrieve system, kernel and process
+metrics from the pseudo-filesystem proc.
+
+*WARNING*: This package is a work in progress. Its API may still break in
+backwards-incompatible ways without warnings. Use it at your own risk.
+
+[![GoDoc](https://godoc.org/github.com/prometheus/procfs?status.png)](https://godoc.org/github.com/prometheus/procfs)
+[![Build Status](https://travis-ci.org/prometheus/procfs.svg?branch=master)](https://travis-ci.org/prometheus/procfs)
+[![Go Report Card](https://goreportcard.com/badge/github.com/prometheus/procfs)](https://goreportcard.com/report/github.com/prometheus/procfs)