Add telemetry and Prometheus endpoint (informalsystems#985)

* Initial telemetry support implementation (informalsystems#868)

* Refactored code for state and service. Replaced hyper with rouille (informalsystems#868)

* Initial logic to include the telemetry in the Supervisor (informalsystems#868)

* Refactored logic into server and service. Server working (informalsystems#868)

* Added new methods for state and server (informalsystems#868)

* Telemetry service logic working, recording a metric (informalsystems#868)

* Added more metrics (informalsystems#868)

* Added logic to disable/enable telemetry service and server (informalsystems#868)

* Added more metrics to service. Hookup the packet timeout metric (informalsystems#868)

* Move telemetry service into `ibc-telemetry` crate

* Move `metric!` macro into its own module

* Move telemetry config under `[telemetry]` section

* Disable telemetry by default, fix port to 3001

* Try to fix libm.so error

* Wrap telemetry state in Arc and simplify server a little

* Simplify server a bit more

* Fix glibc version mismatch between CI and Docker image

* Push telemetry handle down into workers

* Implement `workers`, `ibc_client_misbehaviours` and `receive_packets` metrics

* Add `ibc_client_update` metric

* Remove need for telemetry service by passing around the telemetry state

* Add ack and timeout metrics

* Fix compilation when telemetry feature is not included

* FMT

* Rename metric! macro to telemetry!

* Add `clippy --no-default-features` to CI

Co-authored-by: Andy Nogueira <me@andynogueira.dev>
Co-authored-by: Romain Ruetschi <romain@informal.systems>
Co-authored-by: Anca Zamfir <zamfiranca@gmail.com>
Co-authored-by: Adi Seredinschi <adi@informal.systems>

.github/workflows/rust.yml

@@ -42,7 +42,7 @@ jobs:
           command: fmt
           args: --all -- --check
 
-  clippy_check:
+  clippy_all_features:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
@@ -56,6 +56,20 @@ jobs:
           token: ${{ secrets.GITHUB_TOKEN }}
           args: --all-features --all-targets
 
+  clippy_no_default_features:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          components: clippy
+          override: true
+      - uses: actions-rs/clippy-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --no-default-features --all-targets
+
   test-stable:
     runs-on: ubuntu-latest
     steps: