Add metrics, health, fault tolerance, opentracing

[evie-lau]

Reimplemented the existing health endpoint (/map/v1/health) using MP Health.

It seems the checks used don't actually reflect the state of the other services.

• e.g. - kafka check remains the same after bringing down kafka

This change is 

[BarDweller]

Reviewed 1 of 3 files at r2.
Reviewable status: 1 of 6 files reviewed, 1 unresolved discussion (waiting on @kevinwlau)

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map-wlpcfg/servers/gameon-map/server.xml, line 14 at r2 (raw file):

    </httpEndpoint>

    <quickStartSecurity userName="admin" userPassword="adminpwd"/>

Curious... what exactly is this protecting / why is this required?

Wondering if we shouldn't have this be read from an env var so we can have production/dev versions of the config, rather than having a common value checked into open github ?

[BarDweller]

Reviewed 2 of 5 files at r1, 1 of 3 files at r2.
Reviewable status: 4 of 6 files reviewed, 2 unresolved discussions (waiting on @kevinwlau)

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map-app/src/main/java/org/gameontext/map/SitesResource.java, line 164 at r2 (raw file):

        tags = "label=createRoom")
    public Response createRoom(
            @ApiParam(value = "New room attributes", required = true) @QueryParam("room") RoomInfo newRoom) {

Why did this gain QueryParam?

[evie-lau]

Reviewable status: 4 of 6 files reviewed, 2 unresolved discussions (waiting on @kevinwlau)

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map-app/src/main/java/org/gameontext/map/SitesResource.java, line 164 at r2 (raw file):

Previously, BarDweller (Ozzy Osborne) wrote…

Why did this gain QueryParam?

I had thought the generated API docs was missing parameters. On further inspection, nothing is passed through the URL, so I'll remove this.

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map-wlpcfg/servers/gameon-map/server.xml, line 14 at r2 (raw file):

Previously, BarDweller (Ozzy Osborne) wrote…

Curious... what exactly is this protecting / why is this required?

Wondering if we shouldn't have this be read from an env var so we can have production/dev versions of the config, rather than having a common value checked into open github ?

MP Metrics endpoint is behind HTTPS, and this was a quick way to get setup. I'll look into other ways to configure it.

[BarDweller]

Reviewable status: 4 of 6 files reviewed, 2 unresolved discussions (waiting on @BarDweller)

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map-wlpcfg/servers/gameon-map/server.xml, line 14 at r2 (raw file):

Previously, kevinwlau (Kevin Lau) wrote…

MP Metrics endpoint is behind HTTPS, and this was a quick way to get setup. I'll look into other ways to configure it.

Is it configurable to avoid HTTPS? (for example when we deploy to kube where all traffic from the pod is https handled by istio, and should be plain http inside the pod).

When using docker locally, our services are behind haproxy, which handles any https to the client.

[evie-lau]

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map-wlpcfg/servers/gameon-map/server.xml, line 14 at r2 (raw file):

Previously, BarDweller (Ozzy Osborne) wrote…

Is it configurable to avoid HTTPS? (for example when we deploy to kube where all traffic from the pod is https handled by istio, and should be plain http inside the pod).

When using docker locally, our services are behind haproxy, which handles any https to the client.

I don't think we can avoid HTTPS for this, MP Metrics requires SSL.

[evie-lau]

In order to use OpenTracing with Zipkin, we need to download and unzip the user feature opentracingZipkin and copy it to the docker container.

[ebullient]

Rebased in #117 to drop tracing (pending jaeger)